mirror of
https://github.com/LadybirdBrowser/ladybird
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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.
15 lines
372 B
Plaintext
15 lines
372 B
Plaintext
=== var() through chain ===
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child color: rgb(0, 128, 0)
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parent --ref-color: green
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child --ref-color (inherited): green
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=== inherit keyword ===
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inherit-parent: from-parent
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inherit-child: overridden
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inherit-grandchild: overridden
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=== unset keyword ===
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unset-child: "root-value"
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=== var() fallback ===
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fallback: fallback-value
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=== Multiple var() ===
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combined: hello red 10px
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