From d74d6093f318527addf73cb74c526926c901f339 Mon Sep 17 00:00:00 2001
From: Ehsan-hash <Ehsan.slb@gmail.com>
Date: Thu, 15 Oct 2026 00:04:42 -0700
Subject: [PATCH] Preserve ideographic spaces when copying text

---
 src/clipboard.ts |  4 +--
 test/test.js     | 65 ++++++++++++++++++++++++++++++++++++++++++++++--
 2 files changed, 64 insertions(+), 5 deletions(-)

diff --git a/src/clipboard.ts b/src/clipboard.ts
index 8e1bb0f..fd99971 100644
--- a/src/clipboard.ts
+++ b/src/clipboard.ts
@@ -11,9 +11,7 @@ function createNode(text: string): Element {
 // Normalize characters that render as a space (or as nothing) so that copied
 // text matches what the user sees.
 function normalizeText(text: string): string {
-  return text
-    .replace(/[\u00A0\u1680\u2000-\u200A\u202F\u205F\u3000]/g, ' ')
-    .replace(/[\u200B-\u200D\u2060\uFEFF\u180E]/g, '')
+  return text.replace(/[\u00A0\u1680\u2000-\u200A\u202F\u205F]/g, ' ').replace(/[\u200B-\u200D\u2060\uFEFF\u180E]/g, '')
 }
 
 function copySelection(node: Element): Promise<void> {
diff --git a/test/test.js b/test/test.js
index ab1c7da..1f9cb1e 100644
--- a/test/test.js
+++ b/test/test.js
@@ -179,7 +179,7 @@ describe('clipboard-copy element', function () {
       assert.notInclude(text, '\u00A0')
     })
 
-    it('normalizes Unicode space-separator characters to regular spaces', async function () {
+    it('normalizes Unicode space-separator characters except ideographic spaces', async function () {
       const spaceChars = [
         '\u00A0',
         '\u1680',
@@ -196,7 +196,6 @@ describe('clipboard-copy element', function () {
         '\u200A',
         '\u202F',
         '\u205F',
-        '\u3000',
       ]
 
       for (const char of spaceChars) {
@@ -215,6 +214,29 @@ describe('clipboard-copy element', function () {
       }
     })
 
+    it('preserves ideographic spaces in target element text', async function () {
+      const target = document.createElement('div')
+      target.textContent = 'product\u3000name'
+      target.id = 'copy-target'
+      document.body.append(target)
+
+      const button = document.querySelector('clipboard-copy')
+      button.click()
+
+      const text = await whenCopied
+      assert.equal(text, 'product\u3000name')
+    })
+
+    it('preserves ideographic spaces from the value attribute', async function () {
+      const button = document.querySelector('clipboard-copy')
+      button.setAttribute('value', 'product\u3000name')
+
+      button.click()
+
+      const text = await whenCopied
+      assert.equal(text, 'product\u3000name')
+    })
+
     it('strips zero-width and invisible format characters', async function () {
       const zeroWidthChars = ['\u200B', '\u200C', '\u200D', '\u2060', '\uFEFF', '\u180E']
 
@@ -234,6 +256,45 @@ describe('clipboard-copy element', function () {
       }
     })
 
+    it('preserves ideographic spaces through the legacy fallback', async function () {
+      const descriptor = Object.getOwnPropertyDescriptor(Navigator.prototype, 'clipboard')
+      const execCommandDescriptor = Object.getOwnPropertyDescriptor(document, 'execCommand')
+      assert(descriptor && descriptor.configurable)
+
+      delete navigator.clipboard
+      delete Navigator.prototype.clipboard
+      assert.equal('clipboard' in navigator, false)
+
+      let selectedText
+      Object.defineProperty(document, 'execCommand', {
+        configurable: true,
+        value(command) {
+          if (command === 'copy') selectedText = getSelection().toString()
+          return true
+        },
+      })
+
+      try {
+        const target = document.createElement('div')
+        target.textContent = 'product\u3000name'
+        target.id = 'copy-target'
+        document.body.append(target)
+
+        const button = document.querySelector('clipboard-copy')
+        button.click()
+        await whenCopied
+      } finally {
+        if (execCommandDescriptor) {
+          Object.defineProperty(document, 'execCommand', execCommandDescriptor)
+        } else {
+          delete document.execCommand
+        }
+        Object.defineProperty(Navigator.prototype, 'clipboard', descriptor)
+      }
+
+      assert.equal(selectedText, 'product\u3000name')
+    })
+
     it('does not copy when disabled', async function () {
       const target = document.createElement('div')
       target.innerHTML = 'Hello world!'