feat: make Light DOM a global CSS opt-in - #429

Merged

Mohamed Mansour (mohamedmansour) merged 33 commits into

microsoft:mainfrom

mohamedmansour:mmansour-microsoft-investigate-light-dom

Aug 23, 2026

Commits on Aug 23, 2026

feat: make Light DOM the default rendering mode

Mohamed Mansour (mohamedmansour)
and
Copilot
committed
a8de627
fix: compare component styles semantically

Mohamed Mansour (mohamedmansour)
and
Copilot
committed
1d2d411
fix: preserve Light DOM hydration and styles

Mohamed Mansour (mohamedmansour)
and
Copilot
committed
9029955
fix: place routed styles in owning ShadowRoot

Mohamed Mansour (mohamedmansour)
and
Copilot
committed
1729c72
feat: make Light DOM the component invariant

Mohamed Mansour (mohamedmansour)
and
Copilot
committed
d7f9fb5
fix: eliminate repeated style metadata work

Mohamed Mansour (mohamedmansour)
and
Copilot
committed
4ad8c8c
fix: remove obsolete fixture DOM option

Mohamed Mansour (mohamedmansour)
and
Copilot
committed
b9eecae
fix: restore plugin CSS and harden style closures

Mohamed Mansour (mohamedmansour)
and
Copilot
committed
a84e8ac
Report component style delivery as plugin context

Mohamed Mansour (mohamedmansour)
and
Copilot
committed
1dad32c
Pin the Light CSS scope shape to its measured optimum

Mohamed Mansour (mohamedmansour)
and
Copilot
committed
1a98024
Pin the CSS module importmap inside its route host

Mohamed Mansour (mohamedmansour)
and
Copilot
committed
d2638ef
Move authored CSS into the diagnostic cache instead of cloning it

Mohamed Mansour (mohamedmansour)
and
Copilot
committed
5fd70c0
Correct the measured verdict on Light CSS scope alternatives

Mohamed Mansour (mohamedmansour)
and
Copilot
committed
9319bf9
Scope Light DOM CSS with build-time markers instead of @scope

Mohamed Mansour (mohamedmansour)
and
Copilot
committed
ce766e4
Keep the @scope enclosure for components that render opaque HTML

Mohamed Mansour (mohamedmansour)
and
Copilot
committed
7d9c2cb
Never qualify an at-rule prelude when stamping Light CSS

Mohamed Mansour (mohamedmansour)
and
Copilot
committed
cbfb67c
Cover the Light CSS stamper with input-only invariants

Mohamed Mansour (mohamedmansour)
and
Copilot
committed
a4928a8
Add shared CSS bundle chunking

Mohamed Mansour (mohamedmansour)
and
Copilot
committed
2fd748f
Fix Light events across Shadow boundaries

Mohamed Mansour (mohamedmansour)
and
Copilot
committed
881b7a0
Close the code review findings on Light DOM and CSS bundling

Mohamed Mansour (mohamedmansour)
and
Copilot
committed
d6ac74b
Add --css-bundle to the commerce example server

Mohamed Mansour (mohamedmansour)
and
Copilot
committed
1bf51ba
Document content-hashed filenames for CSS bundle chunks

Mohamed Mansour (mohamedmansour)
and
Copilot
committed
bedae70
Align lazy-hydration fixtures with the authored Shadow rule

Mohamed Mansour (mohamedmansour)
and
Copilot
committed
00d2bc7
Hoist active route styles into head

Mohamed Mansour (mohamedmansour)
and
Copilot
committed
dc47479
Restore Shadow-default mixed DOM strategy

Mohamed Mansour (mohamedmansour)
and
Copilot
committed
13e8543
Remove duplication introduced by the mixed DOM pivot

Mohamed Mansour (mohamedmansour)
and
Copilot
committed
c5e2455
feat: make Light DOM CSS authored and global

Mohamed Mansour (mohamedmansour)
and
Copilot
committed
06e6860
fix: tighten global Light CSS validation

Mohamed Mansour (mohamedmansour)
and
Copilot
committed
7b09019
feat: let bare templates opt into Light DOM

Mohamed Mansour (mohamedmansour)
and
Copilot
committed
c9df99f
Fix component stylesheet check regressions

Mohamed Mansour (mohamedmansour)
and
Copilot
committed
ae35e34
Fix Shadow DOM E2E expectations
Mohamed Mansour (mohamedmansour)
committed
ddc7ab5
fix: address CSS delivery review feedback

Mohamed Mansour (mohamedmansour)
and
Copilot
committed
af2f90f
Fix PR workflow indentation

Mohamed Mansour (mohamedmansour)
and
Copilot
committed
1ce9504

Navigation Menu

Uh oh!

feat: make Light DOM a global CSS opt-in - #429

feat: make Light DOM a global CSS opt-in#429
Mohamed Mansour (mohamedmansour) merged 33 commits into
microsoft:mainfrom
mohamedmansour:mmansour-microsoft-investigate-light-dom

Commits on Aug 23, 2026

feat: make Light DOM the default rendering mode

fix: compare component styles semantically

fix: preserve Light DOM hydration and styles

fix: place routed styles in owning ShadowRoot

feat: make Light DOM the component invariant

fix: eliminate repeated style metadata work

fix: remove obsolete fixture DOM option

fix: restore plugin CSS and harden style closures

Report component style delivery as plugin context

Pin the Light CSS scope shape to its measured optimum

Pin the CSS module importmap inside its route host

Move authored CSS into the diagnostic cache instead of cloning it

Correct the measured verdict on Light CSS scope alternatives

Scope Light DOM CSS with build-time markers instead of @scope

Keep the @scope enclosure for components that render opaque HTML

Never qualify an at-rule prelude when stamping Light CSS

Cover the Light CSS stamper with input-only invariants

Add shared CSS bundle chunking

Fix Light events across Shadow boundaries

Close the code review findings on Light DOM and CSS bundling

Add --css-bundle to the commerce example server

Document content-hashed filenames for CSS bundle chunks

Align lazy-hydration fixtures with the authored Shadow rule

Hoist active route styles into head

Restore Shadow-default mixed DOM strategy

Remove duplication introduced by the mixed DOM pivot

feat: make Light DOM CSS authored and global

fix: tighten global Light CSS validation

feat: let bare templates opt into Light DOM

Fix component stylesheet check regressions

Fix Shadow DOM E2E expectations

fix: address CSS delivery review feedback

Fix PR workflow indentation