Bug 240341 - Turn legacy properties that share a computed style into aliases or shorthands
Summary: Turn legacy properties that share a computed style into aliases or shorthands
Status: NEW
Alias: None
Product: WebKit
Classification: Unclassified
Component: CSS (show other bugs)
Version: WebKit Nightly Build
Hardware: Unspecified Unspecified
: P2 Normal
Assignee: Nobody
URL:
Keywords: InRadar
Depends on: 104805 166782 197656 239808 243562
Blocks:
  Show dependency tree / graph
 
Reported: 2022-05-12 06:23 PDT by Oriol Brufau
Modified: 2022-11-13 02:55 PST (History)
2 users (show)

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Description Oriol Brufau 2022-05-12 06:23:22 PDT 
Currently, there are 8 pairs of properties that share a computed style:

 * background-clip, -webkit-background-clip
 * background-origin, -webkit-background-origin
 * background-size, -webkit-background-size
 * box-shadow, -webkit-box-shadow
 * mask-clip, -webkit-mask-clip
 * mask-composite, -webkit-mask-composite
 * mask-mode, -webkit-mask-source-type
 * text-combine-upright, -webkit-text-combine

This is a non-standard hack. CSS Cascade defines 2 standard ways: https://www.w3.org/TR/css-cascade-5/#aliasing
 * legacy name aliases, for properties with the same exact syntax
 * legacy shorthands, for properties with different syntax

So the -webkit- properties above should be turned into aliases or shorthands.

The current hack is more likely to break things, e.g. revert-layer was broken before bug 238125, and CSSOM is still broken (bug 238874).
Comment 1 Tim Nguyen (:ntim) 2022-05-12 08:34:26 PDT 
Bug 104805 is an example of legacy shorthand.
Comment 2 Radar WebKit Bug Importer 2022-05-19 06:24:13 PDT 
<rdar://problem/93572921>