Bug 276414

Summary:	Handling of negative margins in MathML
Product:	WebKit	Reporter:	Frédéric Wang (:fredw) <fred.wang>
Component:	MathML	Assignee:	Frédéric Wang (:fredw) <fred.wang>
Status:	NEW
Severity:	Normal	CC:	webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified
Bug Depends on:	276428
Bug Blocks:	276169

Frédéric Wang (:fredw)

Reported 2024-07-10 02:26:48 PDT

It seems margin has been supported for mrow-like elements for a while and I've been doing that for other MathML elements in bug 276169's dependencies. MathML elements calculate their sizes from the coordinates/sizes of their children's margin boxes, which can lead to weird cases with negative margins. We should make sure these edge cases don't cause any wrong behavior laying MathML elements, probably clamping negative offsets to 0 when necessary.

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Frédéric Wang (:fredw)

Comment 1 2024-07-10 08:05:51 PDT

There are WPT crash tests for what I'm mentioning: http://wpt.live/mathml/crashtests/children-with-negative-inline-sizes.html http://wpt.live/mathml/crashtests/children-with-negative-block-sizes.html and they don't seem to cause any crash/asserts, so maybe some explicit clamping is not necessary.

Radar WebKit Bug Importer

Comment 2 2024-07-17 02:27:15 PDT

<rdar://problem/131909042>

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