mirror of
https://github.com/LadybirdBrowser/ladybird
synced 2026-04-26 01:35:08 +02:00
9e8e568b43
Replace per-element OrderedHashMap storage for custom properties with a RefCounted chain (CustomPropertyData) that enables structural sharing. Each chain node stores only the properties declared directly on its element, with a parent pointer to the inherited chain. Elements that don't override any custom properties share the parent's data directly (just a RefPtr copy). During cascade, only entries that actually differ from the parent are stored in own_values - the rest are inherited through the chain. During var() resolution, resolved values are compared against the parent's and matching entries are dropped, enabling further sharing. The chain uses a depth limit (max 32) with flattening, plus absorption of small parent nodes (threshold 8) to keep lookups fast. This reduces custom property memory from ~79 MB to ~5.7 MB on cloudflare.com.
40 lines
830 B
Plaintext
40 lines
830 B
Plaintext
=== Basic inheritance ===
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root --color: green
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parent --color: green
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child --color: green
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grandchild --color: green
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=== Root property inheritance ===
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parent --font: serif
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child --font: serif
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grandchild --font: serif
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=== Override at middle ===
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parent --size: 10px
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child --size: 20px
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grandchild --size: 20px
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=== Parent-only property ===
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parent --extra: hello
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child --extra: hello
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grandchild --extra: hello
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=== Deep chain ===
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deep --a: 1
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deep --b: 2
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deep --c: 3
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deep --d: 4
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deep --e: 5
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deep --f: 6
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deep --color: red
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=== Shadowing ===
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shadow-parent --x: parent
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shadow-child --x: child
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shadow-child --y: parent
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=== Pseudo-elements ===
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pseudo::before --pseudo-var: from-pseudo
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pseudo::before --inherited-var: from-element
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=== Dynamic update ===
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before: (empty)
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after:
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changed:
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removed: (empty)
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=== Nonexistent ===
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nonexistent: (empty)
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