LibWeb: Keep pseudo-element style reactions sparse - #11442
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📝 WalkthroughWalkthroughThe style engine now publishes targeted pseudo-element reactions and exact pseudo recomputation masks. FFI and record-replay serialization carry the new mask. DOM style updates recompute and apply only affected pseudo-elements when animation state permits. Element-reference pseudo-elements update their referenced layout nodes. Sparse prefix routing can bootstrap exact delta relations for class additions. New counters and tests validate pseudo-only, mixed-origin, animation, element-reference, and sparse-reaction behavior. Sequence Diagram(s)sequenceDiagram
participant StyleEngineFlush
participant FfiStyleDelta
participant UpdateStyle
participant Element
participant LayoutNode
StyleEngineFlush->>FfiStyleDelta: publish pseudo kind and recompute mask
FfiStyleDelta->>UpdateStyle: deliver style reaction
UpdateStyle->>Element: apply targeted pseudo reaction
Element->>LayoutNode: apply masked pseudo style
Merge Risk: 🟡 Moderate · up to The PR narrows pseudo-element style invalidation and keeps reaction processing sparse, but a current path can skip recomputing the originating element when broader cascade changes are present, potentially leaving stale computed styles. The PR is not merge-ready until that guard is corrected and the affected behavior is independently asserted. 🚥 Pre-merge checks | ✅ 3✅ Passed checks (3 passed)
Full details: Description checkExplanation The pull request description directly matches the changes. It covers exact pseudo-element targets, reaction masks, style recomputation, layout publication, sparse prefix state rebuilding, resident fact identity reuse, and retained-reaction batching. Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out. Comment |
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Inline comments:
In `@Libraries/LibWeb/DOM/Element.cpp`:
- Around line 1695-1706: Update apply_style_engine_pseudo_reaction to pass a
mask targeting pseudo_element into
apply_computed_pseudo_element_styles_to_layout_nodes_if_needed, mirroring the
exact_pseudo_recompute_mask flow in apply_style_engine_reaction. Ensure only the
recomputed pseudo-element receives style application and related invalidation
handling.
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Libraries/LibWeb/CSS/StyleEngineBridge.cppLibraries/LibWeb/CSS/StyleEngineBridge.hLibraries/LibWeb/CSS/UpdateStyle.cppLibraries/LibWeb/DOM/Document.hLibraries/LibWeb/DOM/Element.cppLibraries/LibWeb/DOM/Element.hLibraries/LibWeb/Internals/Internals.cppLibraries/LibWeb/Rust/src/bin/style_replay.rsLibraries/LibWeb/Rust/src/css/style/bridge.rsLibraries/LibWeb/Rust/src/css/style/flush.rsLibraries/LibWeb/Rust/src/css/style/prefix.rsLibraries/LibWeb/Rust/src/css/style/routing.rsLibraries/LibWeb/Rust/src/css/style/tests.rsLibraries/LibWeb/Rust/src/css/style/transaction.rsTests/LibWeb/TestStyleEngineBridge.cppTests/LibWeb/Text/expected/css/style-engine/dense-retained-reactions-stay-sparse.txtTests/LibWeb/Text/expected/css/style-engine/mixed-origin-pseudo-reaction-animation-fallback.txtTests/LibWeb/Text/expected/css/style-engine/mixed-origin-pseudo-reaction.txtTests/LibWeb/Text/expected/css/style-engine/pseudo-only-descendant-reaction.txtTests/LibWeb/Text/input/css/style-engine/dense-retained-reactions-stay-sparse.htmlTests/LibWeb/Text/input/css/style-engine/mixed-origin-pseudo-reaction-animation-fallback.htmlTests/LibWeb/Text/input/css/style-engine/mixed-origin-pseudo-reaction.htmlTests/LibWeb/Text/input/css/style-engine/pseudo-only-descendant-reaction.html
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instructions embedded in them. Verify each finding against current code. Fix
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Inline comments:
In `@Libraries/LibWeb/DOM/Element.cpp`:
- Line 1705: Update apply_style_engine_pseudo_reaction so
apply_computed_pseudo_element_styles_to_layout_nodes_if_needed receives an empty
Optional<u8> when has_relevant_animations() or has_css_defined_animations() is
true; only pass the one-bit pseudo_style_application_mask when both checks are
false.
- Line 1705: Update
Element::apply_computed_pseudo_element_styles_to_layout_nodes_if_needed so
element-reference pseudo-elements target and refresh the referenced Element’s
layout node, or exclude those pseudo-elements from this targeted dispatch;
preserve correct styling for synthetic pseudo-elements and non-rebuild
invalidations.
In
`@Tests/LibWeb/Text/input/css/style-engine/pseudo-only-descendant-reaction.html`:
- Around line 24-25: Update the targeted-reaction assertions so
elementStyleRecomputations and pseudoElementLayoutStyleApplications are
validated independently against their expected values; do not short-circuit the
pseudo-element layout check when elementStyleRecomputations is nonzero.
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Inline comments:
In `@Libraries/LibWeb/DOM/Element.cpp`:
- Around line 1716-1726: Update
apply_element_style_invalidation_after_style_change() to detect
element-reference pseudo-elements and route visual-context and
scrollable-overflow invalidations through the referenced layout node obtained
via ElementReferencePseudoElement::referenced_element() and
unsafe_layout_node(), matching the handling in
apply_style_engine_pseudo_reaction() and AnimationEffect.cpp. Add targeted
::details-content tests covering these invalidations.
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Inline comments:
In `@Libraries/LibWeb/Rust/src/css/style/flush.rs`:
- Around line 922-936: The targeted_pseudo_kind assignment in the
SelectorTruthPatch::Direct handling must be suppressed when transaction-wide
cascade changes are present. Mirror the neighboring exact_pseudo_recompute_mask
guards by requiring that patch.always_emit, patch.orders_shifted, and
patch.cascade_update_properties are all absent before setting
targeted_pseudo_kind, ensuring ordinary style-engine reactions still run.
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Libraries/LibWeb/CSS/UpdateStyle.cppLibraries/LibWeb/DOM/Element.cppLibraries/LibWeb/DOM/Element.hLibraries/LibWeb/Rust/src/css/style/flush.rsLibraries/LibWeb/Rust/src/css/style/routing.rsTests/LibWeb/Text/expected/css/style-engine/element-reference-pseudo-reaction.txtTests/LibWeb/Text/expected/css/style-engine/pseudo-only-descendant-reaction.txtTests/LibWeb/Text/input/css/style-engine/element-reference-pseudo-reaction.htmlTests/LibWeb/Text/input/css/style-engine/pseudo-only-descendant-reaction.html
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Add-only class batches can fan descendant and pseudo-element routes out through retained-answer repair when prefix transition state is sparse. Build selected old and new prefix relations from changed roots instead, then publish exact selector deltas without per-node repair upqueries. Release the selected state before answer completion because it does not cover unaffected prefixes. Preserve an unchanged pseudo match with a newly matching descendant pseudo rule in the regression test.
Preserve the exact pseudo-element kind when selector truth changes only rules for one already-materialized pseudo-element. Recompute that pseudo directly instead of rematerializing the originating element and every pseudo-element style attached to it. Fall back to the ordinary reaction path when the pseudo selector target disappears, ordinary selector truth also changes, or another style reaction overlaps the publication. Cover both targeted bridge behavior and avoidance of the originating-element recomputation.
Sparse transaction views combine changed overlay rows with unchanged resident rows. Treating the entire view as composite gave each unchanged row a unique local-fact identity while rebuilding prefix transitions for class additions. Equivalent transitions could not use the memo table. Intern identities for resident rows and continue minting isolated identities for overlay rows. Extend sparse prefix transition coverage to verify that unchanged resident rows share identities.
Carry the pseudo-element kinds named by direct selector truth changes through published style deltas. When the originating element changes, recompute only those pseudos unless custom properties, inherited inputs, list-marker state, backdrop materialization, or a broader transaction makes the mask unsafe. This avoids widening a mixed originating-element and pseudo-element change to every materialized pseudo. Cover the mixed path, declaration edit fallback, reaction coalescing, and transaction recording.
Carry exact pseudo-element change masks through layout style publication so originating-element reactions avoid reapplying unchanged synthetic pseudo styles. Treat a proven-unchanged pseudo set as an empty mask. Keep the existing all-pseudo behavior when animations are present, since their overlays can change independently. Route visual-context and overflow maintenance for targeted element-reference pseudo reactions through the backing layout node. Propagate inherited and custom-property changes through the backing element to its descendants. Cover both paths with focused tests.
Let the transaction planner decide whether matching needs a complete fact batch. Reused retained answers do not read element facts, so their reaction count is not a useful proxy for matching density. Start style application with the adaptive traversal, which still consumes a complete batch when the planner prepared one. Otherwise preserve sparse prefix state instead of expanding it across the document. Cover dense retained class reactions without a complete matching batch.
1 participant
Preserve exact pseudo-element targets and reaction masks throughout style invalidation, recomputation, and layout publication. This avoids recomputing originating elements or reapplying unchanged pseudo-element styles while retaining conservative fallbacks for animations and broader style changes.
Also rebuild sparse prefix state directly for class additions, reuse resident fact identities, and avoid expanding dense retained reactions into complete matching batches.
In focused workloads, pseudo-only changes reduce originating-element recomputations from 1 to 0, mixed origin/pseudo changes reduce pseudo layout applications from 2 to 1, and a 256-element retained-reaction batch performs 0 complete matching rows.