Bug 219018

Summary:	Quirks mode: body fills the viewport, rather than the html element
Product:	WebKit	Reporter:	Andreu Botella <andreu>
Component:	Layout and Rendering	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Normal	CC:	andreu, bfulgham, simon.fraser, smoley, webkit-bug-importer, zalan
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified

Description Andreu Botella 2020-11-16 20:02:47 PST

By the Quirks Mode spec, the "body fills html" quirk sets the border box size in the block flow direction to the size of the html element minus the margins in body. However, WebKit seems to use the size of the viewport minus the margins, even when the html element has a smaller size.

Tests: https://wpt.fyi/results/quirks?label=pr_head&max-count=1&pr=26438

Comment 1 Smoley 2020-11-18 10:32:25 PST

Thanks for filing. I can reproduce this using http://wpt.live/quirks/body-fills-html-quirk.html on Safari 13.1.3 as well as STP 115 (14.1).

Comment 2 Radar WebKit Bug Importer 2020-11-18 10:32:38 PST

<rdar://problem/71545679>