diff --git a/assets/katex/LICENSE b/assets/katex/LICENSE
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--- /dev/null
+++ b/assets/katex/LICENSE
@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2013-2020 Khan Academy and other contributors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/assets/katex/VERSION.md b/assets/katex/VERSION.md
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index 0000000..32ad1c5
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+++ b/assets/katex/VERSION.md
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+# Vendored KaTeX 0.18.1
+
+**Version:** 0.18.1
+**Source:** npm registry tarball (`npm pack katex@0.18.1`), NOT wired in as an npm dependency -- there is no committed package-lock, and a floating version could silently change the rendering otherwise.
+**License:** MIT (Khan Academy and contributors) -- see `LICENSE` in this folder, taken unmodified from the tarball.
+
+## Vendored files
+The runtime artifacts from the tarball's `dist/` plus `LICENSE`, 23 files in total:
+- `katex.min.js` (KaTeX bundle, UMD, sets `window.katex`)
+- `katex.min.css` (references `fonts/*.woff2` relatively; woff/ttf are not shipped -- every `@font-face` lists `woff2` first, modern VS Code webviews need no fallback)
+- `fonts/*.woff2` (20 files, one per font variant)
+- `LICENSE` (MIT, taken unmodified from the tarball)
+
+`build/copy-assets.js` removes `out/katex/` first (no leftovers across version updates) and then copies exactly these 23 files there (part of `npm run compile`), so the MIT attribution ships with every deploy. Only this `VERSION.md` (update notes for developers) stays exclusively here in `assets/`.
+
+## Update instructions
+Run `npm pack katex@<new-version>` in a temp folder, unpack the tarball, and copy `dist/katex.min.js`, `dist/katex.min.css`, `dist/fonts/*.woff2` as well as `LICENSE` 1:1 over the files in this folder. Then run `npm run compile` and the `test:webview-syntax` + `test:math-segments` gates, and update the version number at the top of this file.
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diff --git a/assets/katex/katex.min.css b/assets/katex/katex.min.css
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+++ b/assets/katex/katex.min.css
@@ -0,0 +1 @@
+@font-face{font-display:block;font-family:KaTeX_AMS;font-style:normal;font-weight:400;src:url(fonts/KaTeX_AMS-Regular.woff2) format("woff2"),url(fonts/KaTeX_AMS-Regular.woff) format("woff"),url(fonts/KaTeX_AMS-Regular.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Caligraphic;font-style:normal;font-weight:700;src:url(fonts/KaTeX_Caligraphic-Bold.woff2) format("woff2"),url(fonts/KaTeX_Caligraphic-Bold.woff) format("woff"),url(fonts/KaTeX_Caligraphic-Bold.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Caligraphic;font-style:normal;font-weight:400;src:url(fonts/KaTeX_Caligraphic-Regular.woff2) format("woff2"),url(fonts/KaTeX_Caligraphic-Regular.woff) format("woff"),url(fonts/KaTeX_Caligraphic-Regular.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Fraktur;font-style:normal;font-weight:700;src:url(fonts/KaTeX_Fraktur-Bold.woff2) format("woff2"),url(fonts/KaTeX_Fraktur-Bold.woff) 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r}countExpansion(e){if(this.expansionCount+=e,this.expansionCount>this.settings.maxExpand)throw new n("Too many expansions: infinite loop or need to increase maxExpand setting")}expandOnce(e){const t=this.popToken(),r=t.text,o=t.noexpand?null:this._getExpansion(r);if(null==o||e&&o.unexpandable){if(e&&null==o&&"\\"===r[0]&&!this.isDefined(r))throw new n("Undefined control sequence: "+r);return this.pushToken(t),!1}this.countExpansion(1);let s=o.tokens;const i=this.consumeArgs(o.numArgs,o.delimiters);if(o.numArgs){s=s.slice();for(let e=s.length-1;e>=0;--e){let t=s[e];if("#"===t.text){if(0===e)throw new n("Incomplete placeholder at end of macro body",t);if(t=s[--e],"#"===t.text)s.splice(e+1,1);else{if(!/^[1-9]$/.test(t.text))throw new n("Not a valid argument number",t);s.splice(e,2,...i[+t.text-1])}}}}return this.pushTokens(s),s.length}expandAfterFuture(){return this.expandOnce(),this.future()}expandNextToken(){for(;;)if(!1===this.expandOnce()){const e=this.stack.pop();return e.treatAsRelax&&(e.text="\\relax"),e}}expandMacro(e){return this.macros.has(e)?this.expandTokens([new en(e)]):void 0}expandTokens(e){const t=[],r=this.stack.length;for(this.pushTokens(e);this.stack.length>r;)if(!1===this.expandOnce(!0)){const e=this.stack.pop();e.treatAsRelax&&(e.noexpand=!1,e.treatAsRelax=!1),t.push(e)}return this.countExpansion(t.length),t}expandMacroAsText(e){const t=this.expandMacro(e);return t?t.map(e=>e.text).join(""):t}_getExpansion(e){const t=this.macros.get(e);if(null==t)return t;if(1===e.length){const t=this.lexer.catcodes[e];if(null!=t&&13!==t)return}const r="function"==typeof t?t(this):t;if("string"==typeof r){let e=0;if(r.includes("#")){const t=r.replace(/##/g,"");for(;t.includes("#"+(e+1));)++e}const t=new jn(r,this.settings),n=[];let o=t.lex();for(;"EOF"!==o.text;)n.push(o),o=t.lex();n.reverse();return{tokens:n,numArgs:e}}return r}isDefined(e){return 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io{constructor(e,t){this.mode=void 0,this.gullet=void 0,this.settings=void 0,this.leftrightDepth=void 0,this.nextToken=void 0,this.mode="math",this.gullet=new to(e,t,this.mode),this.settings=t,this.leftrightDepth=0,this.nextToken=null}expect(e,t){if(void 0===t&&(t=!0),this.fetch().text!==e)throw new n("Expected '"+e+"', got '"+this.fetch().text+"'",this.fetch());t&&this.consume()}consume(){this.nextToken=null}fetch(){return null==this.nextToken&&(this.nextToken=this.gullet.expandNextToken()),this.nextToken}switchMode(e){this.mode=e,this.gullet.switchMode(e)}parse(){this.settings.globalGroup||this.gullet.beginGroup(),this.settings.colorIsTextColor&&this.gullet.macros.set("\\color","\\textcolor");try{const e=this.parseExpression(!1);return this.expect("EOF"),this.settings.globalGroup||this.gullet.endGroup(),e}finally{this.gullet.endGroups()}}subparse(e){const t=this.nextToken;this.consume(),this.gullet.pushToken(new en("}")),this.gullet.pushTokens(e);const r=this.parseExpression(!1);return this.expect("}"),this.nextToken=t,r}parseExpression(e,t){const r=[];for(;;){"math"===this.mode&&this.consumeSpaces();const n=this.fetch();if(io.endOfExpression.has(n.text))break;if(t&&n.text===t)break;if(e&&Ln[n.text]&&Ln[n.text].infix)break;const o=this.parseAtom(t);if(!o)break;"internal"!==o.type&&r.push(o)}return"text"===this.mode&&this.formLigatures(r),this.handleInfixNodes(r)}handleInfixNodes(e){let t,r=-1;for(let o=0;o<e.length;o++){const s=e[o];if("infix"===s.type){if(-1!==r)throw new n("only one infix operator per group",s.token);r=o,t=s.replaceWith}}if(-1!==r&&t){let n,o;const s=e.slice(0,r),i=e.slice(r+1);let l;return n=1===s.length&&"ordgroup"===s[0].type?s[0]:{type:"ordgroup",mode:this.mode,body:s},o=1===i.length&&"ordgroup"===i[0].type?i[0]:{type:"ordgroup",mode:this.mode,body:i},l="\\\\abovefrac"===t?this.callFunction(t,[n,e[r],o],[]):this.callFunction(t,[n,o],[]),[l]}return e}handleSupSubscript(e){const t=this.fetch(),r=t.text;let o;this.consume(),this.consumeSpaces();do{var s;o=this.parseGroup(e)}while("internal"===(null==(s=o)?void 0:s.type));if(!o)throw new n("Expected group after '"+r+"'",t);return o}formatUnsupportedCmd(e){const t=[];for(let r=0;r<e.length;r++)t.push({type:"textord",mode:"text",text:e[r]});const r={type:"text",mode:this.mode,body:t};return{type:"color",mode:this.mode,color:this.settings.errorColor,body:[r]}}parseAtom(e){const t=this.parseGroup("atom",e);if("internal"===(null==t?void 0:t.type))return t;if("text"===this.mode)return t;let r,o;for(;;){this.consumeSpaces();const e=this.fetch();if("\\limits"===e.text||"\\nolimits"===e.text){if(t&&"op"===t.type)t.limits="\\limits"===e.text,t.alwaysHandleSupSub=!0;else{if(!t||"operatorname"!==t.type)throw new n("Limit controls must follow a math operator",e);t.alwaysHandleSupSub&&(t.limits="\\limits"===e.text)}this.consume()}else if("^"===e.text){if(r)throw new n("Double superscript",e);r=this.handleSupSubscript("superscript")}else if("_"===e.text){if(o)throw new n("Double subscript",e);o=this.handleSupSubscript("subscript")}else if("'"===e.text){if(r)throw new n("Double superscript",e);const t={type:"textord",mode:this.mode,text:"\\prime"},o=[t];for(this.consume();"'"===this.fetch().text;)o.push(t),this.consume();"^"===this.fetch().text&&o.push(this.handleSupSubscript("superscript")),r={type:"ordgroup",mode:this.mode,body:o}}else{if(!no[e.text])break;{const t=ro.test(e.text),n=[];for(n.push(new en(no[e.text])),this.consume();;){const e=this.fetch().text;if(!no[e])break;if(ro.test(e)!==t)break;n.unshift(new en(no[e])),this.consume()}const s=this.subparse(n);t?o={type:"ordgroup",mode:"math",body:s}:r={type:"ordgroup",mode:"math",body:s}}}}return r&&o?{type:"supsub",mode:this.mode,base:t,sup:r,sub:o}:r?{type:"supsub",mode:this.mode,base:t,sup:r}:o?{type:"supsub",mode:this.mode,base:t,sub:o}:t}parseFunction(e,t){const r=this.fetch(),o=r.text,s=Ln[o];if(!s)return null;if(this.consume(),t&&"atom"!==t&&!s.allowedInArgument)throw new n("Got function '"+o+"' with no arguments"+(t?" as "+t:""),r);if("text"===this.mode&&!s.allowedInText)throw new n("Can't use function '"+o+"' in text mode",r);if("math"===this.mode&&!1===s.allowedInMath)throw new n("Can't use function '"+o+"' in math mode",r);const i=this.parseArguments(o,s),l=i.args,a=i.optArgs;return this.callFunction(o,l,a,r,e)}callFunction(e,t,r,o,s){const i={funcName:e,parser:this,token:o,breakOnTokenText:s},l=Ln[e];if(l&&l.handler)return l.handler(i,t,r);throw new n("No function handler for "+e)}parseArguments(e,t){var r;const o=null!=(r=t.numOptionalArgs)?r:0,s=t.numArgs+o;if(0===s)return{args:[],optArgs:[]};const i=[],l=[];for(let r=0;r<s;r++){var a;let s=null==(a=t.argTypes)?void 0:a[r];const c=r<o;("primitive"in t&&t.primitive&&null==s||"sqrt"===t.type&&1===r&&null==l[0])&&(s="primitive");const h=this.parseGroupOfType("argument to '"+e+"'",s,c);if(c)l.push(h);else{if(null==h)throw new n("Null argument, please report this as a bug");i.push(h)}}return{args:i,optArgs:l}}parseGroupOfType(e,t,r){switch(t){case"color":return this.parseColorGroup(r);case"size":return this.parseSizeGroup(r);case"url":return this.parseUrlGroup(r);case"math":case"text":return this.parseArgumentGroup(r,t);case"hbox":{const e=this.parseArgumentGroup(r,"text");return null!=e?{type:"styling",mode:e.mode,body:[e],style:"text",resetFont:!0}:null}case"raw":{const e=this.parseStringGroup(r);return null!=e?{type:"raw",mode:"text",string:e.text}:null}case"primitive":{if(r)throw new n("A primitive argument cannot be optional");const t=this.parseGroup(e);if(null==t)throw new n("Expected group as "+e,this.fetch());return t}case"original":case void 0:return this.parseArgumentGroup(r);default:throw new n("Unknown group type as "+e,this.fetch())}}consumeSpaces(){for(;" "===this.fetch().text;)this.consume()}parseStringGroup(e){const t=this.gullet.scanArgument(e);if(null==t)return null;let r,n="";for(;"EOF"!==(r=this.fetch()).text;)n+=r.text,this.consume();return this.consume(),t.text=n,t}parseRegexGroup(e,t){const r=this.fetch();let o,s=r,i="";for(;"EOF"!==(o=this.fetch()).text&&e.test(i+o.text);)s=o,i+=s.text,this.consume();if(""===i)throw new n("Invalid "+t+": '"+r.text+"'",r);return r.range(s,i)}parseColorGroup(e){const t=this.parseStringGroup(e);if(null==t)return null;const r=/^(#[a-f0-9]{3,4}|#[a-f0-9]{6}|#[a-f0-9]{8}|[a-f0-9]{6}|[a-z]+)$/i.exec(t.text);if(!r)throw new n("Invalid color: '"+t.text+"'",t);let o=r[0];return/^[0-9a-f]{6}$/i.test(o)&&(o="#"+o),{type:"color-token",mode:this.mode,color:o}}parseSizeGroup(e){let t,r=!1;if(this.gullet.consumeSpaces(),t=e||"{"===this.gullet.future().text?this.parseStringGroup(e):this.parseRegexGroup(/^[-+]? *(?:$|\d+|\d+\.\d*|\.\d*) *[a-z]{0,2} *$/,"size"),!t)return null;e||0!==t.text.length||(t.text="0pt",r=!0);const o=/([-+]?) *(\d+(?:\.\d*)?|\.\d+) *([a-z]{2})/.exec(t.text);if(!o)throw new n("Invalid size: '"+t.text+"'",t);const s={number:+(o[1]+o[2]),unit:o[3]};if(!E(s))throw new n("Invalid unit: '"+s.unit+"'",t);return{type:"size",mode:this.mode,value:s,isBlank:r}}parseUrlGroup(e){this.gullet.lexer.setCatcode("%",13),this.gullet.lexer.setCatcode("~",12);const t=this.parseStringGroup(e);if(this.gullet.lexer.setCatcode("%",14),this.gullet.lexer.setCatcode("~",13),null==t)return null;const r=t.text.replace(/\\([#$%&~_^{}])/g,"$1");return{type:"url",mode:this.mode,url:r}}parseArgumentGroup(e,t){const r=this.gullet.scanArgument(e);if(null==r)return null;const n=this.mode;t&&this.switchMode(t),this.gullet.beginGroup();const o=this.parseExpression(!1,"EOF");this.expect("EOF"),this.gullet.endGroup();const s={type:"ordgroup",mode:this.mode,loc:r.loc,body:o};return t&&this.switchMode(n),s}parseGroup(e,t){const r=this.fetch(),o=r.text;let s;if("{"===o||"\\begingroup"===o){this.consume();const e="{"===o?"}":"\\endgroup";this.gullet.beginGroup();const t=this.parseExpression(!1,e),n=this.fetch();this.expect(e),this.gullet.endGroup(),s={type:"ordgroup",mode:this.mode,loc:Qr.range(r,n),body:t,semisimple:"\\begingroup"===o||void 0}}else if(s=this.parseFunction(t,e)||this.parseSymbol(),null==s&&"\\"===o[0]&&!Object.prototype.hasOwnProperty.call(eo,o)){if(this.settings.throwOnError)throw new n("Undefined control sequence: "+o,r);s=this.formatUnsupportedCmd(o),this.consume()}return s}formLigatures(e){let t=e.length-1;for(let r=0;r<t;++r){const n=e[r];if("textord"!==n.type)continue;const o=n.text,s=e[r+1];if(s&&"textord"===s.type){if("-"===o&&"-"===s.text){const o=e[r+2];r+1<t&&o&&"textord"===o.type&&"-"===o.text?(e.splice(r,3,{type:"textord",mode:"text",loc:Qr.range(n,o),text:"---"}),t-=2):(e.splice(r,2,{type:"textord",mode:"text",loc:Qr.range(n,s),text:"--"}),t-=1)}"'"!==o&&"`"!==o||s.text!==o||(e.splice(r,2,{type:"textord",mode:"text",loc:Qr.range(n,s),text:o+o}),t-=1)}}}parseSymbol(){const e=this.fetch();let t=e.text;if(/^\\verb[^a-zA-Z]/.test(t)){this.consume();let e=t.slice(5);const r="*"===e.charAt(0);if(r&&(e=e.slice(1)),e.length<2||e.charAt(0)!==e.slice(-1))throw new n("\\verb assertion failed --\n                    please report what input caused this bug");return e=e.slice(1,-1),{type:"verb",mode:"text",body:e,star:r}}Object.prototype.hasOwnProperty.call(so,t[0])&&!ne[this.mode][t[0]]&&(this.settings.strict&&"math"===this.mode&&this.settings.reportNonstrict("unicodeTextInMathMode",'Accented Unicode text character "'+t[0]+'" used in math mode',e),t=so[t[0]]+t.slice(1));const r=Gn.exec(t);let o;if(r&&(t=t.substring(0,r.index),"i"===t?t="\u0131":"j"===t&&(t="\u0237")),ne[this.mode][t]){this.settings.strict&&"math"===this.mode&&Me.includes(t)&&this.settings.reportNonstrict("unicodeTextInMathMode",'Latin-1/Unicode text character "'+t[0]+'" used in math mode',e);const r=ne[this.mode][t].group,n=Qr.range(e);let i;s=r,i=rr.has(s)?{type:"atom",mode:this.mode,family:r,loc:n,text:t}:{type:r,mode:this.mode,loc:n,text:t},o=i}else{if(!(t.charCodeAt(0)>=128))return null;this.settings.strict&&(T(t.charCodeAt(0))?"math"===this.mode&&this.settings.reportNonstrict("unicodeTextInMathMode",'Unicode text character "'+t[0]+'" used in math mode',e):this.settings.reportNonstrict("unknownSymbol",'Unrecognized Unicode character "'+t[0]+'" ('+t.charCodeAt(0)+")",e)),o={type:"textord",mode:"text",loc:Qr.range(e),text:t}}var s;if(this.consume(),r)for(let t=0;t<r[0].length;t++){const s=r[0][t];if(!oo[s])throw new n("Unknown accent ' "+s+"'",e);const i=oo[s][this.mode]||oo[s].text;if(!i)throw new n("Accent "+s+" unsupported in "+this.mode+" mode",e);o={type:"accent",mode:this.mode,loc:Qr.range(e),label:i,isStretchy:!1,isShifty:!0,base:o}}return o}}io.endOfExpression=new Set(["}","\\endgroup","\\end","\\right","&"]);var lo=function(e,t){if(!("string"==typeof e||e instanceof String))throw new TypeError("KaTeX can only parse string typed expression");const r=new io(e,t);delete r.gullet.macros.current["\\df@tag"];let o=r.parse();if(delete r.gullet.macros.current["\\current@color"],delete r.gullet.macros.current["\\color"],r.gullet.macros.get("\\df@tag")){if(!t.displayMode)throw new n("\\tag works only in display equations");o=[{type:"tag",mode:"text",body:o,tag:r.subparse([new en("\\df@tag")])}]}return o};let ao=function(e,t,r){t.textContent="";const n=ho(e,r).toNode();t.appendChild(n)};"undefined"!=typeof document&&"CSS1Compat"!==document.compatMode&&("undefined"!=typeof console&&console.warn("Warning: KaTeX doesn't work in quirks mode. Make sure your website has a suitable doctype."),ao=function(){throw new n("KaTeX doesn't work in quirks mode.")});const co=function(e,t,r){if(r.throwOnError||!(e instanceof n))throw e;const o=Ye(["katex-error"],[new W(t)]);return o.setAttribute("title",e.toString()),o.setAttribute("style","color:"+r.errorColor),o},ho=function(e,t){const r=new g(t);try{const t=lo(e,r);return Zt(t,e,r)}catch(t){return co(t,e,r)}};var mo={version:"0.18.1",render:ao,renderToString:function(e,t){return ho(e,t).toMarkup()},ParseError:n,SETTINGS_SCHEMA:u,__parse:function(e,t){const r=new g(t);return lo(e,r)},__renderToDomTree:ho,__renderToHTMLTree:function(e,t){const r=new g(t);try{return function(e,t,r){const n=Tt(e,_t(r)),o=Ye(["katex"],[n]);return $t(o,r)}(lo(e,r),0,r)}catch(t){return co(t,e,r)}},__setFontMetrics:function(e,t){K[e]=t},__defineSymbol:oe,__defineFunction:mt,__defineMacro:Jr,__domTree:{Span:U,Anchor:j,SymbolNode:W,SvgNode:_,PathNode:$,LineNode:Z}};return t=t.default}()});
\ No newline at end of file
diff --git a/build/check-webview-syntax.js b/build/check-webview-syntax.js
new file mode 100644
index 0000000..c622fc6
--- /dev/null
+++ b/build/check-webview-syntax.js
@@ -0,0 +1,86 @@
+#!/usr/bin/env node
+'use strict';
+
+// Committed version of a check we used to run by hand before shipping the KaTeX
+// rendering feature: script.ts/ui.ts are giant TypeScript template literals producing
+// the webview's HTML/JS as plain strings, so tsc happily compiles a typo like a stray unescaped
+// backtick or "${" -- it only breaks once that string reaches an actual browser. This
+// script proves the emitted <script> content still parses, and that ui.ts actually
+// references the vendored KaTeX assets. Node builtins only, run via
+// `npm run test:webview-syntax` (which compiles first).
+
+const path = require('path');
+
+function fail(message) {
+	console.error('FAIL: ' + message);
+	process.exit(1);
+}
+
+let getScript;
+let getHtml;
+try {
+	getScript = require(path.join('..', 'out', 'script.js')).default;
+	getHtml = require(path.join('..', 'out', 'ui.js')).default;
+} catch (e) {
+	fail('could not load out/script.js / out/ui.js (did npm run compile run first?): ' + e.message);
+}
+
+if (typeof getScript !== 'function') {
+	fail('out/script.js has no default export function (getScript)');
+}
+if (typeof getHtml !== 'function') {
+	fail('out/ui.js has no default export function (getHtml)');
+}
+
+// ── 1) out/script.js: syntax-proof the <script> content getScript() returns ──
+const scriptHtml = getScript(false);
+
+const scriptBlockRe = /<script(?:\s[^>]*)?>([\s\S]*?)<\/script>/g;
+const scriptBlocks = [...scriptHtml.matchAll(scriptBlockRe)];
+if (scriptBlocks.length === 0) {
+	fail('getScript(false) did not contain a <script>...</script> block to check');
+}
+for (let i = 0; i < scriptBlocks.length; i++) {
+	const body = scriptBlocks[i][1];
+	try {
+		// Parses (doesn't execute) -- a syntax proof only, same as the "new Function"
+		// smoke test this used to be run as a manual step. Browser globals (document,
+		// window, vscode, katex, ...) aren't defined here and don't need to be: we're
+		// not calling the resulting function, just confirming it compiles.
+		new Function(body);
+	} catch (e) {
+		fail('<script> block ' + (i + 1) + '/' + scriptBlocks.length + ' failed to parse: ' + e.message);
+	}
+}
+
+// ── 2) out/ui.js: getHtml() must actually reference the vendored KaTeX assets ──
+const html = getHtml(false, undefined, undefined, undefined, 'check-webview-syntax', '0.0.0', 'vscode-resource://check/out/katex');
+if (!html.includes('katex.min.css')) {
+	fail('getHtml(...) output does not reference katex.min.css');
+}
+if (!html.includes('katex.min.js')) {
+	fail('getHtml(...) output does not reference katex.min.js');
+}
+
+// -- 3) The code-block restore loop in parseSimpleMarkdown must run through the
+// spliced restoreCodeBlockPlaceholders(html, codeBlockPlaceholders), never again
+// through a direct html.replace(placeholder, str) -- String.replace interprets
+// "$&"/"$`"/"$'"/"$$" in the replacement string as substitution patterns and thereby
+// corrupts any code block that contains one of these sequences --
+if (!scriptHtml.includes('function restoreCodeBlockPlaceholders')) {
+	fail('getScript(...) output does not contain the spliced restoreCodeBlockPlaceholders (markdown-restore.ts)');
+}
+// Discriminating needle: "restoreCodeBlockPlaceholders(html, codeBlockPlaceholders)" alone
+// would be a tautology -- the string is already present in the spliced function head
+// ("function restoreCodeBlockPlaceholders(html, codeBlockPlaceholders) {") and would thus
+// still PASS even if the call site in parseSimpleMarkdown were removed. "html = " in front
+// of it only occurs in the emit at the real call site.
+if (!scriptHtml.includes('html = restoreCodeBlockPlaceholders(')) {
+	fail('getScript(...) output does not call restoreCodeBlockPlaceholders(...) from the code-block restore loop');
+}
+if (/html\.replace\(placeholder,\s*codeBlockPlaceholders\[i\]\)/.test(scriptHtml)) {
+	fail('getScript(...) output still contains the unsafe html.replace(placeholder, codeBlockPlaceholders[i]) string-replacement regression');
+}
+
+console.log('PASS: getScript() <script> content parses (' + scriptBlocks.length + ' block(s), ' + scriptHtml.length + ' chars), getHtml() references katex.min.css + katex.min.js, and the restoreCodeBlockPlaceholders splice is present and the code-block restore loop is safe');
+process.exit(0);
diff --git a/build/copy-assets.js b/build/copy-assets.js
new file mode 100644
index 0000000..fc8ae7d
--- /dev/null
+++ b/build/copy-assets.js
@@ -0,0 +1,30 @@
+#!/usr/bin/env node
+'use strict';
+
+// Second half of the "compile" npm script: tsc only handles src/**/*.ts, so
+// anything the webview loads via asWebviewUri (the vendored KaTeX assets, see
+// assets/katex/VERSION.md) needs an explicit copy into out/ -- tsc's outDir never sees
+// non-.ts files. Node builtins only, no new dependency for a two-file build step.
+//
+// Copies katex.min.js + katex.min.css + LICENSE + 20 fonts/*.woff2 (23 files total) --
+// LICENSE travels into out/ too so the MIT attribution ships with whatever gets deployed
+// from there; only VERSION.md (dev-facing update notes) stays source-tree-only.
+//
+// out/katex/ is removed first (recursive, force) so a future KaTeX version that drops a
+// file (e.g. a retired font) can't leave a stale leftover behind in the build output.
+
+const fs = require('fs');
+const path = require('path');
+
+const assetsDir = path.join(__dirname, '..', 'assets', 'katex');
+const outDir = path.join(__dirname, '..', 'out', 'katex');
+
+fs.rmSync(outDir, { recursive: true, force: true });
+fs.mkdirSync(outDir, { recursive: true });
+fs.cpSync(path.join(assetsDir, 'katex.min.js'), path.join(outDir, 'katex.min.js'));
+fs.cpSync(path.join(assetsDir, 'katex.min.css'), path.join(outDir, 'katex.min.css'));
+fs.cpSync(path.join(assetsDir, 'LICENSE'), path.join(outDir, 'LICENSE'));
+fs.cpSync(path.join(assetsDir, 'fonts'), path.join(outDir, 'fonts'), { recursive: true });
+
+const fontCount = fs.readdirSync(path.join(outDir, 'fonts')).length;
+console.log('copy-assets: out/katex/ <- katex.min.js, katex.min.css, LICENSE, fonts/ (' + fontCount + ' font files)');
diff --git a/package.json b/package.json
index 6bcdf89..9121e0b 100644
--- a/package.json
+++ b/package.json
@@ -208,20 +208,28 @@
           "type": "boolean",
           "default": false,
           "description": "Enable the local router to convert OpenAI format to Anthropic format. Required for providers that use OpenAI-compatible APIs."
+        },
+        "claudeCodeChat.ui.renderMath": {
+          "type": "boolean",
+          "default": true,
+          "description": "Render LaTeX/TeX math in chat messages ($...$, $$...$$, \\(...\\), \\[...\\]) using the bundled KaTeX."
         }
       }
     }
   },
   "scripts": {
     "vscode:prepublish": "npm run compile",
-    "compile": "tsc -p ./",
-    "watch": "tsc -watch -p ./",
+    "compile": "tsc -p ./ && node build/copy-assets.js",
+    "watch": "node build/copy-assets.js && tsc -watch -p ./",
     "pretest": "npm run compile && npm run lint",
     "lint": "eslint src",
     "test": "vscode-test",
     "test:downloader": "npm run compile && mocha --ui tdd \"out/test/downloader*.test.js\" --reporter spec --timeout 360000",
     "test:downloader:unit": "npm run compile && mocha --ui tdd out/test/downloader.test.js --reporter spec",
-    "test:models": "npm run compile && mocha --ui tdd out/test/model-updater.test.js --reporter spec"
+    "test:models": "npm run compile && mocha --ui tdd out/test/model-updater.test.js --reporter spec",
+    "test:math-segments": "npm run compile && mocha --ui tdd out/test/math-segments.test.js --reporter spec",
+    "test:markdown-restore": "npm run compile && mocha --ui tdd out/test/markdown-restore.test.js --reporter spec",
+    "test:webview-syntax": "npm run compile && node build/check-webview-syntax.js"
   },
   "devDependencies": {
     "@types/mocha": "^10.0.10",
diff --git a/src/extension.ts b/src/extension.ts
index 8fa37fb..9e506c4 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -250,7 +250,7 @@ class ClaudeChatProvider {
 		const iconPath = vscode.Uri.joinPath(this._extensionUri, 'icon-bubble.png');
 		this._panel.iconPath = iconPath;
 
-		this._panel.webview.html = this._getHtmlForWebview();
+		this._panel.webview.html = this._getHtmlForWebview(this._panel.webview);
 
 		this._panel.onDidDispose(() => this.dispose(), null, this._disposables);
 
@@ -706,7 +706,7 @@ class ClaudeChatProvider {
 
 		this._webview = webview;
 		this._webviewView = webviewView;
-		this._webview.html = this._getHtmlForWebview();
+		this._webview.html = this._getHtmlForWebview(this._webview);
 
 		this._setupWebviewMessageHandler(this._webview);
 		this._initializePermissions();
@@ -3383,8 +3383,12 @@ class ClaudeChatProvider {
 		}
 	}
 
-	private _getHtmlForWebview(): string {
-		return getHtml(vscode.env?.isTelemetryEnabled, OPENCREDITS_API_URL, OPENCREDITS_WEB_URL, OPENCREDITS_PUBLISHABLE_KEY, vscode.env?.appName, this._context?.extension?.packageJSON?.version);
+	private _getHtmlForWebview(webview: vscode.Webview): string {
+		// out/katex/ (copy-assets.js, see assets/katex/VERSION.md) served through
+		// the webview's own resource URI scheme -- localResourceRoots already covers the
+		// whole extension folder at both call sites above.
+		const katexBaseUri = webview.asWebviewUri(vscode.Uri.joinPath(this._extensionUri, 'out', 'katex')).toString();
+		return getHtml(vscode.env?.isTelemetryEnabled, OPENCREDITS_API_URL, OPENCREDITS_WEB_URL, OPENCREDITS_PUBLISHABLE_KEY, vscode.env?.appName, this._context?.extension?.packageJSON?.version, katexBaseUri);
 	}
 
 	private _sendCurrentSettings(): void {
@@ -3400,6 +3404,7 @@ class ClaudeChatProvider {
 			'executable.path': config.get<string>('executable.path', ''),
 			'environment.variables': config.get<Record<string, string>>('environment.variables', {}),
 			'environment.disabled': config.get<boolean>('environment.disabled', false),
+			'ui.renderMath': config.get<boolean>('ui.renderMath', true),
 			'isOpenCredits': this._isOpenCredits()
 		};
 
diff --git a/src/markdown-restore.ts b/src/markdown-restore.ts
new file mode 100644
index 0000000..28b4348
--- /dev/null
+++ b/src/markdown-restore.ts
@@ -0,0 +1,20 @@
+// Placeholder back-substitution for code blocks in parseSimpleMarkdown (found during
+// review). String.replace(placeholder, value) interprets "$&"/"$`"/"$'"/"$$" in the
+// replacement string as substitution patterns -- a code block whose (already-escaped)
+// content happens to contain such a sequence (e.g. shell code with "$'...'") corrupts
+// the surrounding HTML instead of appearing unchanged. restoreMathSegments
+// (math-script.ts) has had this fix from the start -- this function brings the code-block
+// restore loop up to the same standard (function replacement instead of string
+// replacement). script.ts splices only the compiled function text into the page via
+// .toString() (same pattern as restoreMathSegments in math-script.ts) -- that's why this
+// function must stay self-contained: no module-level symbol, no import, no helper
+// function outside the body.
+export function restoreCodeBlockPlaceholders(html: string, codeBlockPlaceholders: string[]): string {
+	for (let i = 0; i < codeBlockPlaceholders.length; i++) {
+		const placeholder = '__CODEBLOCK_' + i + '__';
+		const value = codeBlockPlaceholders[i];
+		// Function replacement, NEVER a string directly as the 2nd argument (see comment above).
+		html = html.replace(placeholder, function () { return value; });
+	}
+	return html;
+}
diff --git a/src/math-script.ts b/src/math-script.ts
new file mode 100644
index 0000000..12e0ad9
--- /dev/null
+++ b/src/math-script.ts
@@ -0,0 +1,83 @@
+import { findMathSegments } from './math-segments';
+
+// Webview-side LaTeX rendering (upstream #171), injected into script.ts's
+// getScript() template the same way getSkillsScript()/getPluginsScript() are (see
+// plugins-script.ts). Two different things happen below and they must not be confused:
+//
+// 1. findMathSegments.toString() is a REAL, host-side template interpolation (like
+//    getSkillsScript()/getPluginsScript() themselves): it runs in Node when getMathScript()
+//    is called, and splices that function's own *compiled* source into the returned
+//    string. math-segments.ts must stay fully self-contained for exactly this reason --
+//    only its own text crosses into the browser, not the rest of that module.
+// 2. Everything else below (renderMathHtml, extractMathSegments, restoreMathSegments) is
+//    plain webview source written directly in this template literal. None of it happens to
+//    need a client-side "${...}" or a backtick, so nothing here needs the "\${"/"\`"
+//    escaping script.ts's own template literal requires elsewhere -- but if you add code
+//    that does, escape it the same way (see script.ts's parseSimpleMarkdown for examples).
+const getMathScript = () => `
+		// ─── Math (KaTeX) ───
+		${findMathSegments.toString()}
+
+		// Fallback text for renderMathHtml: wraps the escaped source in $ / $$ (display
+		// uses the doubled form) so the message still shows it used to be a formula,
+		// instead of silently dropping to bare text indistinguishable from surrounding
+		// prose. Note this normalizes to $/$$ regardless of which delimiter the original
+		// segment used -- a \(...\) or \[...\] segment falls back to $ / $$ too, not its
+		// own backslash delimiters.
+		function mathFallbackText(tex, display) {
+			var delim = display ? '$$' : '$';
+			return delim + escapeHtml(tex) + delim;
+		}
+
+		// katex.min.js (loaded via a synchronous <script> before this one, see ui.ts)
+		// exposes window.katex. Falls back to mathFallbackText instead of dropping the
+		// message if the library is missing (e.g. out/katex/ didn't survive a deploy) or
+		// throws something throwOnError:false doesn't already catch.
+		function renderMathHtml(tex, display) {
+			if (typeof katex === 'undefined' || !katex || typeof katex.renderToString !== 'function') {
+				return mathFallbackText(tex, display);
+			}
+			try {
+				return katex.renderToString(tex, {
+					displayMode: display,
+					throwOnError: false,
+					trust: false,
+					strict: 'ignore'
+				});
+			} catch (e) {
+				return mathFallbackText(tex, display);
+			}
+		}
+
+		// Extraction half of the parseSimpleMarkdown hook: cuts every math segment out of
+		// the raw text and replaces it with a nonce-scoped placeholder, mirroring the
+		// __CODEBLOCK_N__ placeholders already used for fenced code. Walking segments
+		// back-to-front keeps earlier (start, end) offsets valid while later ones are
+		// spliced out of the string.
+		function extractMathSegments(text) {
+			var nonce = Math.random().toString(36).slice(2);
+			var segments = findMathSegments(text);
+			var placeholders = [];
+			for (var i = segments.length - 1; i >= 0; i--) {
+				var seg = segments[i];
+				var placeholder = '__CCCMATH_' + nonce + '_' + i + '__';
+				placeholders.push({ placeholder: placeholder, html: renderMathHtml(seg.tex, seg.display) });
+				text = text.slice(0, seg.start) + placeholder + text.slice(seg.end);
+			}
+			return { text: text, placeholders: placeholders };
+		}
+
+		// Restore half: uses function-replacement, never a plain string as the 2nd
+		// argument -- String.replace treats "$&"/"$\`"/"$'" in a string replacement as
+		// substitution patterns, and KaTeX's own HTML output can easily contain a "$"
+		// right before such a character.
+		function restoreMathSegments(html, placeholders) {
+			for (var i = 0; i < placeholders.length; i++) {
+				var mathHtml = placeholders[i].html;
+				html = html.replace(placeholders[i].placeholder, function() { return mathHtml; });
+			}
+			return html;
+		}
+`;
+
+export default getMathScript;
diff --git a/src/math-segments.ts b/src/math-segments.ts
new file mode 100644
index 0000000..2ce3119
--- /dev/null
+++ b/src/math-segments.ts
@@ -0,0 +1,205 @@
+// Pure scanner for the LaTeX-rendering feature (upstream #171): finds $…$ / $$…$$ /
+// \(…\) / \[…\] math segments in the raw text parseSimpleMarkdown works on, before
+// escapeHtml or any markdown rule touches it. No vscode import, so this runs under plain
+// mocha like model-updater.
+//
+// findMathSegments is never called directly by the webview's copy of this file -- it has
+// none. Instead math-script.ts injects this function's own compiled source via
+// findMathSegments.toString() into the page (see math-script.ts for why). That means
+// EVERY helper this function needs must be declared INSIDE its body: .toString() only
+// ever returns the function's own text, not the rest of this module, so a module-level
+// const or helper referenced from inside the function would be undefined in the browser.
+
+export interface MathSegment {
+	// Offsets into the original text (start inclusive, end exclusive) covering the full
+	// match INCLUDING its delimiters, e.g. text.slice(start, end) === '$E = mc^2$'.
+	start: number;
+	end: number;
+	tex: string;
+	display: boolean;
+}
+
+export function findMathSegments(text: string): MathSegment[] {
+	// Hard cap so a pathological response with hundreds of "$" characters can't turn one
+	// render pass into hundreds of synchronous KaTeX calls.
+	const MATH_SEGMENT_CAP = 200;
+
+	const segments: { start: number; end: number; tex: string; display: boolean }[] = [];
+	const isSpace = (c: string) => c === ' ' || c === '\t' || c === '\n' || c === '\r';
+	const isDigit = (c: string) => c >= '0' && c <= '9';
+	// $9.99$ price-trap guard: reject a body that's only digits/./,/. whitespace -- real
+	// math almost always has a letter, operator or backslash command in it.
+	const isNumericOnly = (s: string) => /^[0-9.,\s]+$/.test(s);
+	// Guard against a __CODEBLOCK_N__ placeholder ending up inside a math body: a blind
+	// indexOf to the closing delimiter can walk straight over the placeholder without ever
+	// landing on it (the top-level placeholder skip below only protects the scan
+	// *position*, not a body a closer search reaches across it) -- reject any candidate
+	// whose body contains one instead of rendering the placeholder text itself as "math".
+	const containsCodeBlockPlaceholder = (s: string) => s.indexOf('__CODEBLOCK_') !== -1;
+	// Guard against a "PID trap": a shell/regex aside like "the PID is in $$. The
+	// formula is:\n\n$$E=mc^2$$" must not have its first "$$...$$" swallow the prose up to
+	// the real formula. A blank line ends math mode in real LaTeX too, so reject a display
+	// body that contains one (checked for $$, \[...\] and \(...\) too -- see the call
+	// sites below).
+	const hasBlankLine = (s: string) => /\n\s*\n/.test(s);
+	// Guard against a raw backtick inside the body: an inline code span like `$HOME` puts
+	// its own "$" inside backticks, and letting that "$" close a math candidate here would
+	// corrupt the eventual <code> replacement around what should have stayed a plain,
+	// unrendered code span.
+	const containsBacktick = (s: string) => s.indexOf('`') !== -1;
+
+	let i = 0;
+	while (i < text.length) {
+		if (segments.length >= MATH_SEGMENT_CAP) {
+			break;
+		}
+
+		const c = text[i];
+		const next = text[i + 1];
+
+		// `\$` / `\\` -- an escaped dollar or an escaped backslash: skip both characters
+		// so a real "$" right after isn't mistaken for a delimiter.
+		if (c === '\\' && (next === '$' || next === '\\')) {
+			i += 2;
+			continue;
+		}
+
+		// Inline code span `` `...` `` -- still raw here (parseSimpleMarkdown's
+		// single-backtick-to-<code> conversion runs after this hook), so a "$" inside one
+		// must not be read as math.
+		if (c === '`') {
+			const closeTick = text.indexOf('`', i + 1);
+			i = closeTick === -1 ? text.length : closeTick + 1;
+			continue;
+		}
+
+		// __CODEBLOCK_N__ placeholder from the extraction step right before this hook --
+		// must never end up inside (or split across) a math segment.
+		if (text.startsWith('__CODEBLOCK_', i)) {
+			const marker = '__CODEBLOCK_';
+			const closePh = text.indexOf('__', i + marker.length);
+			i = closePh === -1 ? text.length : closePh + 2;
+			continue;
+		}
+
+		// Display math $$...$$ -- checked before single-$ so a pair isn't read as two
+		// empty inline segments. Resync on a rejected candidate depends on WHY it failed:
+		// an empty/numeric/placeholder/backtick body means the failed closer was a real "$$"
+		// delimiter that simply didn't belong to OUR opener, so we resync past IT --
+		// otherwise "$$100$$ Euro ... $$E=mc^2$$" would have its first, numeric-only pair's
+		// closer misread as the next candidate's opener and never reach the real formula. A
+		// blank-line reject is the one exception: there the failed closer is prose swallowed
+		// by a runaway search (the PID trap below), so that case still only advances past the
+		// OPENER, letting a real "$$...$$" pair further along the text get found on a later
+		// pass through this same branch.
+		if (c === '$' && next === '$') {
+			const close = text.indexOf('$$', i + 2);
+			if (close !== -1) {
+				const body = text.slice(i + 2, close);
+				if (body.trim() && !isNumericOnly(body) && !containsCodeBlockPlaceholder(body) && !containsBacktick(body) && !hasBlankLine(body)) {
+					segments.push({ start: i, end: close + 2, tex: body, display: true });
+					i = close + 2;
+					continue;
+				}
+				if (!hasBlankLine(body)) {
+					i = close + 2;
+					continue;
+				}
+			}
+			i += 2;
+			continue;
+		}
+
+		// Display math \[...\] -- same resync rule as $$...$$ above: past the failed
+		// CLOSER on an empty/placeholder/backtick reject, past the OPENER only on a
+		// blank-line reject (unchanged, same PID-trap-style reasoning).
+		if (c === '\\' && next === '[') {
+			const close = text.indexOf('\\]', i + 2);
+			if (close !== -1) {
+				const body = text.slice(i + 2, close);
+				if (body.trim() && !containsCodeBlockPlaceholder(body) && !containsBacktick(body) && !hasBlankLine(body)) {
+					segments.push({ start: i, end: close + 2, tex: body, display: true });
+					i = close + 2;
+					continue;
+				}
+				if (!hasBlankLine(body)) {
+					i = close + 2;
+					continue;
+				}
+			}
+			i += 2;
+			continue;
+		}
+
+		// Inline math \(...\) -- same body guards as \[...\] above: this form must also
+		// reject an empty or blank-line-spanning body, otherwise a prose-spanning "\(...\)"
+		// could swallow a real pair further down the text the same way the PID trap does for
+		// $$ (see hasBlankLine above). Resync on reject still just advances past this OPENER,
+		// unlike the two display forms -- this delimiter isn't in scope for the $$/\[...\]
+		// closer-end resync above, and the simpler behaviour is exactly what the blank-line
+		// guard itself relies on.
+		if (c === '\\' && next === '(') {
+			const close = text.indexOf('\\)', i + 2);
+			if (close !== -1) {
+				const body = text.slice(i + 2, close);
+				if (body.trim() && !containsCodeBlockPlaceholder(body) && !containsBacktick(body) && !hasBlankLine(body)) {
+					segments.push({ start: i, end: close + 2, tex: body, display: false });
+					i = close + 2;
+					continue;
+				}
+			}
+			i += 2;
+			continue;
+		}
+
+		// Inline math $...$, with price-vs-math guards: no whitespace right after the opener
+		// or right before the closer, no digit right after the closer (adjacent "$5$10"
+		// style money), single line, body not purely numeric, and not containing a backtick
+		// -- an inline code span's own "$" must not be read as this delimiter's closer.
+		if (c === '$') {
+			if (next === undefined || isSpace(next)) {
+				i++;
+				continue;
+			}
+			let j = i + 1;
+			let close = -1;
+			while (j < text.length) {
+				if (text[j] === '\\') {
+					// Guard against a backslash-newline pair smuggling a multi-line body past
+					// the single-line rule below: "\" followed by a real line break must end
+					// the candidate like a bare "\n" would -- blindly jumping 2 chars here
+					// would miss that.
+					if (text[j + 1] === '\n') {
+						break;
+					}
+					j += 2;
+					continue;
+				}
+				if (text[j] === '\n') {
+					break;
+				}
+				if (text[j] === '$') {
+					if (!isSpace(text[j - 1]) && !isDigit(text[j + 1] || '')) {
+						close = j;
+					}
+					break;
+				}
+				j++;
+			}
+			if (close !== -1) {
+				const body = text.slice(i + 1, close);
+				if (body.trim() && !isNumericOnly(body) && !containsCodeBlockPlaceholder(body) && !containsBacktick(body)) {
+					segments.push({ start: i, end: close + 1, tex: body, display: false });
+					i = close + 1;
+					continue;
+				}
+			}
+			i++;
+			continue;
+		}
+
+		i++;
+	}
+
+	return segments;
+}
diff --git a/src/script.ts b/src/script.ts
index 4c949e2..fc0166a 100644
--- a/src/script.ts
+++ b/src/script.ts
@@ -1,5 +1,7 @@
 import getSkillsScript from './skills-script';
 import getPluginsScript from './plugins-script';
+import getMathScript from './math-script';
+import { restoreCodeBlockPlaceholders } from './markdown-restore';
 
 const getScript = (isTelemetryEnabled: boolean, opencreditsApiUrl: string = 'https://ccc.api.opencredits.ai', opencreditsWebUrl: string = 'https://ccc.opencredits.ai', opencreditsPublishableKey: string = 'oc_pk_c43da4f9a9484ae484ad29bc97cc354f') => `<script>
 		var OPENCREDITS_API_URL = '${opencreditsApiUrl}';
@@ -81,6 +83,10 @@ const getScript = (isTelemetryEnabled: boolean, opencreditsApiUrl: string = 'htt
 		let isWindows = false;
 		let lastPendingEditIndex = -1; // Track the last Edit/MultiEdit/Write toolUse without result
 		let lastPendingEditData = null; // Store diff data for the pending edit { filePath, oldContent, newContent }
+		// LaTeX rendering (upstream #171): claudeCodeChat.ui.renderMath toggle, default on.
+		// Guards the math extraction/restore steps in parseSimpleMarkdown below -- off
+		// makes messages fall through exactly as before this feature (raw "$"/"\\(" text).
+		let renderMathEnabled = true;
 		let attachedImages = []; // Array of { filePath, previewUri }
 
 		// Open diff using stored data (no file read needed)
@@ -4408,7 +4414,12 @@ const getScript = (isTelemetryEnabled: boolean, opencreditsApiUrl: string = 'htt
 		}
 
 		updateStatus('Initializing...', 'disconnected');
-		
+
+		// restoreCodeBlockPlaceholders (the call site is further below in
+		// parseSimpleMarkdown) -- build-time splice (same pattern as math-script), so that
+		// npm run test:markdown-restore can check the function under Node. The next line
+		// splices the compiled function source via toString() into the webview script string.
+		${restoreCodeBlockPlaceholders.toString()}
 
 		function parseSimpleMarkdown(markdown) {
 			// First, handle code blocks before line-by-line processing
@@ -4442,7 +4453,21 @@ const getScript = (isTelemetryEnabled: boolean, opencreditsApiUrl: string = 'htt
 				codeBlockPlaceholders.push(codeBlockHtml);
 				return placeholder;
 			});
-			
+
+			// LaTeX rendering (upstream #171): extract $…$ / $$…$$ / \(…\) / \[…\] math segments
+			// before any further markdown processing -- the italic regex below would
+			// tear "x_1 … y_2" apart. Same placeholder approach as the code blocks
+			// above, with its own __CCCMATH_<nonce>_<i>__ prefix so the two extraction
+			// passes can't collide.
+			// Guarded by claudeCodeChat.ui.renderMath (renderMathEnabled, default
+			// on) -- off skips extraction so the raw "$"/"\(" text falls through exactly
+			// like before this feature, instead of being replaced with rendered/fallback HTML.
+			let mathExtraction = { text: processedMarkdown, placeholders: [] };
+			if (renderMathEnabled) {
+				mathExtraction = extractMathSegments(processedMarkdown);
+				processedMarkdown = mathExtraction.text;
+			}
+
 			// Handle inline code with single backticks
 			const inlineCodeRegex = new RegExp('\\\`([^\\\`]+)\\\`', 'g');
 			processedMarkdown = processedMarkdown.replace(inlineCodeRegex, '<code>$1</code>');
@@ -4526,12 +4551,18 @@ const getScript = (isTelemetryEnabled: boolean, opencreditsApiUrl: string = 'htt
 			if (inUnorderedList) html += '</ul>';
 			if (inOrderedList) html += '</ol>';
 
-			// Restore code block placeholders
-			for (let i = 0; i < codeBlockPlaceholders.length; i++) {
-				const placeholder = '__CODEBLOCK_' + i + '__';
-				html = html.replace(placeholder, codeBlockPlaceholders[i]);
+			// Restore math placeholders before the code-block restore below.
+			// Guarded the same way as the extraction step above.
+			if (renderMathEnabled) {
+				html = restoreMathSegments(html, mathExtraction.placeholders);
 			}
 
+			// Restore code block placeholders. restoreCodeBlockPlaceholders (spliced
+			// above) uses function-replacement, not html.replace(placeholder, str) --
+			// otherwise "$&"/"$\`"/"$'"/"$$" inside a code block would be interpreted as
+			// String.replace substitution patterns and tear the surrounding HTML apart.
+			html = restoreCodeBlockPlaceholders(html, codeBlockPlaceholders);
+
 			return html;
 		}
 
@@ -4863,6 +4894,8 @@ const getScript = (isTelemetryEnabled: boolean, opencreditsApiUrl: string = 'htt
 			const yoloMode = document.getElementById('yolo-mode').checked;
 			const executablePath = document.getElementById('executable-path').value;
 			const useRouter = document.getElementById('use-router')?.checked || false;
+			// LaTeX rendering (upstream #171): math rendering toggle
+			const renderMath = document.getElementById('render-math').checked;
 
 			// Collect environment variables from key-value UI
 			const envVariables = getEnvVariablesFromUI();
@@ -4902,7 +4935,8 @@ const getScript = (isTelemetryEnabled: boolean, opencreditsApiUrl: string = 'htt
 					'permissions.yoloMode': yoloMode,
 					'executable.path': executablePath,
 					'environment.variables': envVariables,
-					'router.enabled': useRouter
+					'router.enabled': useRouter,
+					'ui.renderMath': renderMath
 				}
 			});
 		}
@@ -5159,6 +5193,10 @@ const getScript = (isTelemetryEnabled: boolean, opencreditsApiUrl: string = 'htt
 				});
 			} else if (message.type === 'settingsData') {
 				// Update UI with current settings
+				// LaTeX rendering (upstream #171): math rendering toggle, default on
+				renderMathEnabled = message.data['ui.renderMath'] !== false;
+				document.getElementById('render-math').checked = renderMathEnabled;
+
 				const thinkingIntensity = message.data['thinking.intensity'] || 'think';
 				const intensityValues = ['think', 'think-hard', 'think-harder', 'ultrathink'];
 				const sliderValue = intensityValues.indexOf(thinkingIntensity);
@@ -5352,6 +5390,7 @@ const getScript = (isTelemetryEnabled: boolean, opencreditsApiUrl: string = 'htt
 			}
 		});
 
+	${getMathScript()}
 	${getSkillsScript()}
 	${getPluginsScript()}
 	</script>`
diff --git a/src/test/markdown-restore.test.ts b/src/test/markdown-restore.test.ts
new file mode 100644
index 0000000..2f3ff34
--- /dev/null
+++ b/src/test/markdown-restore.test.ts
@@ -0,0 +1,87 @@
+// Unit tests for the code-block restore loop (restoreCodeBlockPlaceholders), the
+// __CODEBLOCK_N__ half of parseSimpleMarkdown's placeholder dance. Pure (no vscode, no
+// network, no DOM), so these run under plain mocha against the compiled out/ output --
+// same pattern as the math-segments unit tests. A review found that the loop used
+// html.replace(placeholder, str), a plain STRING as the 2nd argument -- String.replace
+// treats "$&"/"$`"/"$'"/"$$" in a string replacement as substitution patterns, so a code
+// block whose (already-escaped) content happens to contain one of those sequences tears
+// the surrounding HTML apart instead of being reinserted unchanged. restoreMathSegments
+// (math-script.ts) already used function-replacement for exactly this reason when the
+// LaTeX-rendering feature introduced it; this fixes the code-block loop to match. The
+// first suite covers ordinary multi-placeholder restores, the second is the regression
+// suite for each substitution pattern individually plus one combined case, and the third
+// is the splice-sandbox test that proves the function still works with zero module
+// context -- exactly how script.ts's .toString() splice runs it in the webview. Run with
+// `npm run test:markdown-restore`.
+
+import * as assert from 'assert';
+import { restoreCodeBlockPlaceholders } from '../markdown-restore';
+
+suite('markdown-restore: restoreCodeBlockPlaceholders (basic)', () => {
+
+	test('a single placeholder is replaced by its code block value', () => {
+		const result = restoreCodeBlockPlaceholders('before __CODEBLOCK_0__ after', ['<pre>x</pre>']);
+		assert.strictEqual(result, 'before <pre>x</pre> after');
+	});
+
+	test('multiple placeholders are each restored to their own value, in order', () => {
+		const html = '__CODEBLOCK_0__ mid __CODEBLOCK_1__ mid __CODEBLOCK_2__';
+		const result = restoreCodeBlockPlaceholders(html, ['<pre>a</pre>', '<pre>b</pre>', '<pre>c</pre>']);
+		assert.strictEqual(result, '<pre>a</pre> mid <pre>b</pre> mid <pre>c</pre>');
+	});
+
+	test('an empty placeholders array leaves html unchanged', () => {
+		assert.strictEqual(restoreCodeBlockPlaceholders('<p>no code blocks here</p>', []), '<p>no code blocks here</p>');
+	});
+});
+
+suite('markdown-restore: restoreCodeBlockPlaceholders ($ substitution patterns)', () => {
+
+	test('"$&" (matched-substring pattern) in the code block value survives unchanged, not the matched placeholder', () => {
+		const codeHtml = '<pre class="code-block"><code>echo $&amp; run in background</code></pre>';
+		const html = '<p>before</p>__CODEBLOCK_0__<p>after</p>';
+		const result = restoreCodeBlockPlaceholders(html, [codeHtml]);
+		assert.strictEqual(result, '<p>before</p>' + codeHtml + '<p>after</p>');
+	});
+
+	test('"$`" (pre-match pattern) in the code block value survives unchanged, not a copy of the preceding HTML', () => {
+		const codeHtml = '<pre class="code-block"><code>VAR=$`date`</code></pre>';
+		const html = '<p>before</p>__CODEBLOCK_0__<p>after</p>';
+		const result = restoreCodeBlockPlaceholders(html, [codeHtml]);
+		assert.strictEqual(result, '<p>before</p>' + codeHtml + '<p>after</p>');
+	});
+
+	test('"$\'" (post-match pattern) in the code block value survives unchanged, not a copy of the following HTML', () => {
+		const codeHtml = '<pre class="code-block"><code>MSG=$\'it worked\'</code></pre>';
+		const html = '<p>before</p>__CODEBLOCK_0__<p>after</p>';
+		const result = restoreCodeBlockPlaceholders(html, [codeHtml]);
+		assert.strictEqual(result, '<p>before</p>' + codeHtml + '<p>after</p>');
+	});
+
+	test('"$$" (escaped-dollar pattern) in the code block value does not collapse to a single "$"', () => {
+		const codeHtml = '<pre class="code-block"><code>echo $$ # current PID</code></pre>';
+		const html = '<p>before</p>__CODEBLOCK_0__<p>after</p>';
+		const result = restoreCodeBlockPlaceholders(html, [codeHtml]);
+		assert.strictEqual(result, '<p>before</p>' + codeHtml + '<p>after</p>');
+	});
+
+	test('a code block combining "$&", "$`", "$\'" and "$$" survives the restore byte-for-byte', () => {
+		const dollarPatterns = 'a$&b a$`b a$\'b a$$b';
+		const codeHtml = '<pre class="code-block"><code>' + dollarPatterns + '</code></pre>';
+		const html = '<p>before</p>__CODEBLOCK_0__<p>after</p>';
+		const result = restoreCodeBlockPlaceholders(html, [codeHtml]);
+		assert.strictEqual(result, '<p>before</p>' + codeHtml + '<p>after</p>');
+	});
+});
+
+suite('markdown-restore: toString() splice sandbox', () => {
+
+	test('restoreCodeBlockPlaceholders still works when spliced into a Function body with zero module context, matching the real call', () => {
+		const spliced = new Function(
+			restoreCodeBlockPlaceholders.toString() +
+			'\nreturn restoreCodeBlockPlaceholders(arguments[0], arguments[1]);');
+		const html = '<p>before</p>__CODEBLOCK_0__<p>after</p>';
+		const placeholders = ['<pre>a$&b a$`b a$\'b</pre>'];
+		assert.deepStrictEqual(spliced(html, placeholders), restoreCodeBlockPlaceholders(html, placeholders));
+	});
+});
diff --git a/src/test/math-segments.test.ts b/src/test/math-segments.test.ts
new file mode 100644
index 0000000..b315e34
--- /dev/null
+++ b/src/test/math-segments.test.ts
@@ -0,0 +1,177 @@
+// Unit tests for the LaTeX-rendering scanner (findMathSegments). Pure (no vscode, no
+// network, no filesystem access), so these run under plain mocha against the compiled
+// out/ output -- same pattern as the model-updater unit tests. The first 13
+// cases cover the core price-vs-math / delimiter-matching behaviour; the next 3 cover
+// additional edge cases (\$ alone, an empty $$$$ pair, an unbalanced $); the next 5 guard
+// against a __CODEBLOCK_N__ placeholder ending up inside a math body, a "PID trap" (a
+// shell/regex aside like "the PID is in $$" swallowing a real formula further down) and a
+// backslash immediately followed by a real line break; the last 7 guard against a
+// backtick (code span) inside a math body, a rejected numeric/placeholder $$...$$ pair
+// swallowing a real pair further down, a blank line inside a \(...\) body, and an empty
+// \[...\] body. Run with `npm run test:math-segments`.
+
+import * as assert from 'assert';
+import { findMathSegments } from '../math-segments';
+
+suite('math-segments: findMathSegments (core delimiter matching)', () => {
+
+	test('does not match adjacent price mentions ("$5 and $10")', () => {
+		assert.strictEqual(findMathSegments('This costs $5 and $10 together.').length, 0);
+	});
+
+	test('does not match shell-style variables ($PATH, $HOME)', () => {
+		assert.strictEqual(findMathSegments('Reset $PATH and $HOME.').length, 0);
+	});
+
+	test('matches inline math ($E = mc^2$) and reports the right offsets', () => {
+		const text = 'The formula $E = mc^2$ is famous.';
+		const segs = findMathSegments(text);
+		assert.strictEqual(segs.length, 1);
+		assert.strictEqual(segs[0].tex, 'E = mc^2');
+		assert.strictEqual(segs[0].display, false);
+		assert.strictEqual(segs[0].start, 12);
+		assert.strictEqual(segs[0].end, 22);
+		assert.strictEqual(text.slice(segs[0].start, segs[0].end), '$E = mc^2$');
+	});
+
+	test('matches display math ($$...$$)', () => {
+		const segs = findMathSegments('$$\\int_0^1 x dx$$');
+		assert.strictEqual(segs.length, 1);
+		assert.strictEqual(segs[0].tex, '\\int_0^1 x dx');
+		assert.strictEqual(segs[0].display, true);
+	});
+
+	test('matches \\(...\\) and \\[...\\] in the same line', () => {
+		const segs = findMathSegments('Inline \\(a_1 + b_2\\) and Block \\[x^2\\]');
+		assert.strictEqual(segs.length, 2);
+		assert.strictEqual(segs[0].tex, 'a_1 + b_2');
+		assert.strictEqual(segs[0].display, false);
+		assert.strictEqual(segs[1].tex, 'x^2');
+		assert.strictEqual(segs[1].display, true);
+	});
+
+	test('leaves inline code untouched (`$x$` stays raw)', () => {
+		assert.strictEqual(findMathSegments('Code `$x$` stays raw.').length, 0);
+	});
+
+	test('skips over a __CODEBLOCK_N__ placeholder instead of matching across it', () => {
+		const segs = findMathSegments('__CODEBLOCK_0__ and $a+b$');
+		assert.strictEqual(segs.length, 1);
+		assert.strictEqual(segs[0].tex, 'a+b');
+	});
+
+	test('treats \\$ as a literal escaped dollar, not a delimiter', () => {
+		const segs = findMathSegments('Escaped \\$5 is text, $y=x$ is math.');
+		assert.strictEqual(segs.length, 1);
+		assert.strictEqual(segs[0].tex, 'y=x');
+	});
+
+	test('rejects a "$" followed by whitespace (not treated as an opener)', () => {
+		assert.strictEqual(findMathSegments('a $ b $ c').length, 0);
+	});
+
+	test('rejects a decimal price ($9.99$, purely numeric body)', () => {
+		assert.strictEqual(findMathSegments('Price $9.99$ discount').length, 0);
+	});
+
+	test('matches a display block containing "&" (aligned environment)', () => {
+		const segs = findMathSegments('$$\\begin{aligned} a &= b \\\\ c &= d \\end{aligned}$$');
+		assert.strictEqual(segs.length, 1);
+		assert.strictEqual(segs[0].tex, '\\begin{aligned} a &= b \\\\ c &= d \\end{aligned}');
+	});
+
+	test('does not match inline "$...$" across a line break', () => {
+		assert.strictEqual(findMathSegments('Multi-line $a\nb$ not matched.').length, 0);
+	});
+
+	test('matches a multi-line display block ($$ on its own lines)', () => {
+		const segs = findMathSegments('$$\n x^2 + y^2 = z^2 \n$$');
+		assert.strictEqual(segs.length, 1);
+		assert.strictEqual(segs[0].tex.trim(), 'x^2 + y^2 = z^2');
+		assert.strictEqual(segs[0].display, true);
+	});
+});
+
+suite('math-segments: findMathSegments (additional edge cases)', () => {
+
+	test('a lone escaped \\$ with no other dollar is not a segment', () => {
+		assert.strictEqual(findMathSegments('Just \\$ as text, no math.').length, 0);
+	});
+
+	test('an empty $$$$ pair does not match (no content between the delimiters)', () => {
+		assert.strictEqual(findMathSegments('$$$$').length, 0);
+	});
+
+	test('an unbalanced single "$" with no closer does not match and does not hang', () => {
+		assert.strictEqual(findMathSegments('Text with an unclosed $formula and no end.').length, 0);
+	});
+});
+
+suite('math-segments: findMathSegments (delimiter edge cases: embedded placeholders, blank-line guards, backslash-newline)', () => {
+
+	test('rejects a $...$ candidate whose body contains a __CODEBLOCK_N__ placeholder between the delimiters', () => {
+		// The pre-existing "skips over a __CODEBLOCK_N__ placeholder" test above only
+		// has the placeholder BEFORE the math, so it never actually exercised the "closer
+		// search walks across a placeholder" bug this covers.
+		assert.strictEqual(findMathSegments('$a __CODEBLOCK_0__ b$').length, 0);
+	});
+
+	test('rejects a $$ pair spanning prose up to a blank line, then still matches the real pair after it (PID trap)', () => {
+		const segs = findMathSegments('The Bash PID is in $$. The formula reads:\n\n$$E = mc^2$$');
+		assert.strictEqual(segs.length, 1);
+		assert.strictEqual(segs[0].tex, 'E = mc^2');
+		assert.strictEqual(segs[0].display, true);
+	});
+
+	test('rejects a $$ pair whose body contains a blank line, with no valid pair afterward', () => {
+		assert.strictEqual(findMathSegments('$$Text before the blank line\n\nafter$$').length, 0);
+	});
+
+	test('rejects a \\[...\\] pair whose body contains a blank line', () => {
+		assert.strictEqual(findMathSegments('\\[Text before the blank line\n\nafter\\]').length, 0);
+	});
+
+	test('a backslash immediately followed by a real line break ends an inline $...$ candidate', () => {
+		assert.strictEqual(findMathSegments('Line $x\\\ny$ no match.').length, 0);
+	});
+});
+
+suite('math-segments: findMathSegments (backtick guards, numeric-pair resync, blank-line and empty-body guards)', () => {
+
+	test('rejects an inline $...$ candidate whose body contains a backtick (`` `$HOME` `` code span)', () => {
+		assert.strictEqual(findMathSegments('Cost: $20 per month. Set `$HOME` correctly.').length, 0);
+	});
+
+	test('rejects a $$...$$ candidate whose body contains a backtick-fenced span with its own "$$" inside', () => {
+		assert.strictEqual(findMathSegments('$$ paragraph with `code $$ inside` end $$').length, 0);
+	});
+
+	test('a rejected numeric $$...$$ pair does not swallow the real pair further down ("$$100$$ Euro ... $$E=mc^2$$")', () => {
+		const segs = findMathSegments('The price is $$100$$ Euro, the formula is $$E=mc^2$$');
+		assert.strictEqual(segs.length, 1);
+		assert.strictEqual(segs[0].tex, 'E=mc^2');
+	});
+
+	test('two rejected numeric $$...$$ pairs in a row still let the real pair after them match', () => {
+		const segs = findMathSegments('Price $$5.00$$ and $$9,99$$ and $$E=mc^2$$');
+		assert.strictEqual(segs.length, 1);
+		assert.strictEqual(segs[0].tex, 'E=mc^2');
+	});
+
+	test('a rejected $$...$$ pair containing a __CODEBLOCK_N__ placeholder does not swallow the real pair further down', () => {
+		const segs = findMathSegments('$$ __CODEBLOCK_0__ $$ Text $$E=mc^2$$');
+		assert.strictEqual(segs.length, 1);
+		assert.strictEqual(segs[0].tex, 'E=mc^2');
+	});
+
+	test('\\(...\\) rejects a body spanning a blank line, then still matches the real pair after it', () => {
+		const segs = findMathSegments('Write \\( for inline math.\n\nExample: \\(x^2\\)');
+		assert.strictEqual(segs.length, 1);
+		assert.strictEqual(segs[0].tex, 'x^2');
+		assert.strictEqual(segs[0].display, false);
+	});
+
+	test('\\[...\\] rejects an empty body', () => {
+		assert.strictEqual(findMathSegments('Empty \\[\\] end').length, 0);
+	});
+});
diff --git a/src/ui-styles.ts b/src/ui-styles.ts
index 76bd766..497136a 100644
--- a/src/ui-styles.ts
+++ b/src/ui-styles.ts
@@ -1197,6 +1197,20 @@ const styles = `
         white-space: pre;
     }
 
+    /* KaTeX: display formulas can be wider than the sidebar; overflow-y/padding here
+       keep a tall formula (e.g. a matrix) from adding a vertical scrollbar of its own. */
+    .katex-display {
+        overflow-x: auto;
+        overflow-y: hidden;
+        padding: 2px 0 6px;
+    }
+
+    /* KaTeX sets its own inline style="color:..." on .katex-error (throwOnError:false),
+       so !important is required here to actually win over it and match the theme. */
+    .katex-error {
+        color: var(--vscode-errorForeground) !important;
+    }
+
     .message-content pre.code-block code {
         background: none;
         border: none;
diff --git a/src/ui.ts b/src/ui.ts
index 4ffcab7..58b31d0 100644
--- a/src/ui.ts
+++ b/src/ui.ts
@@ -8,13 +8,16 @@ import getSkillsHtml from './skills-ui'
 import getPluginsHtml from './plugins-ui'
 
 
-const getHtml = (isTelemetryEnabled: boolean, opencreditsApiUrl: string = 'https://ccc.api.opencredits.ai', opencreditsWebUrl: string = 'https://ccc.opencredits.ai', opencreditsPublishableKey: string = 'oc_pk_c43da4f9a9484ae484ad29bc97cc354f', editorName: string = 'unknown', extensionVersion: string = 'unknown') => `<!DOCTYPE html>
+const getHtml = (isTelemetryEnabled: boolean, opencreditsApiUrl: string = 'https://ccc.api.opencredits.ai', opencreditsWebUrl: string = 'https://ccc.opencredits.ai', opencreditsPublishableKey: string = 'oc_pk_c43da4f9a9484ae484ad29bc97cc354f', editorName: string = 'unknown', extensionVersion: string = 'unknown', katexBaseUri: string) => `<!DOCTYPE html>
 <html lang="en">
 <head>
 	<meta charset="UTF-8">
 	<meta name="viewport" content="width=device-width, initial-scale=1.0">
 	<meta http-equiv="Content-Security-Policy" content="default-src * 'unsafe-inline' 'unsafe-eval' data: blob:; frame-src *;">
 	<title>Claude Code Chat</title>
+	<!-- Loaded before the main stylesheet so our own .katex-error/.katex-display
+	     rules (ui-styles.ts) win the cascade over KaTeX's defaults of the same specificity. -->
+	<link rel="stylesheet" href="${katexBaseUri}/katex.min.css">
 	${styles}
 </head>
 <body>
@@ -412,6 +415,10 @@ const getHtml = (isTelemetryEnabled: boolean, opencreditsApiUrl: string = 'https
 					<p id="providerExclusionHint" style="display: none; font-size: 11px; color: var(--vscode-descriptionForeground); margin: 4px 0 0 24px;">
 						When enabled, requests are routed only through US and EU-based infrastructure providers.
 					</p>
+					<div class="tool-item" style="margin-top: 16px;">
+						<input type="checkbox" id="render-math" onchange="updateSettings()">
+						<label for="render-math">Render LaTeX/TeX math (KaTeX)</label>
+					</div>
 				</div>
 
 			</div>
@@ -1074,6 +1081,9 @@ const getHtml = (isTelemetryEnabled: boolean, opencreditsApiUrl: string = 'https
 	</div>
 
 	<script>window.__recommendedModels = ${JSON.stringify(recommendedModels)};window.__topMcpServers = ${JSON.stringify(topMcpServers)};window.__topSkills = ${JSON.stringify(topSkills)};window.__topPlugins = ${JSON.stringify(topPlugins)};</script>
+	<!-- Synchronous (no defer/async) so window.katex exists before getScript()'s
+	     renderMathHtml can run -- a classic <script src> blocks parsing until it loads. -->
+	<script src="${katexBaseUri}/katex.min.js"></script>
 	${getScript(isTelemetryEnabled, opencreditsApiUrl, opencreditsWebUrl, opencreditsPublishableKey)}
 	
 	<!--