Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 9859ca110720f4aa00864da517dc6ea34a24e259
      
https://github.com/WebKit/WebKit/commit/9859ca110720f4aa00864da517dc6ea34a24e259
  Author: Ahmad Saleem <[email protected]>
  Date:   2026-10-12 (Mon, 12 Oct 2026)

  Changed paths:
    M 
LayoutTests/imported/w3c/web-platform-tests/html/rendering/non-replaced-elements/the-page/body-margin-3a-expected.txt
    M 
LayoutTests/imported/w3c/web-platform-tests/html/rendering/non-replaced-elements/the-page/body-margin-3b-expected.txt
    M Source/WebCore/html/HTMLAttributeNames.in
    M Source/WebCore/html/HTMLBodyElement.cpp

  Log Message:
  -----------
  Remove support for body's rightmargin and bottommargin presentational 
attributes
https://bugs.webkit.org/show_bug.cgi?id=327127
rdar://189727708

Reviewed by Chris Dumez.

This patch aligns WebKit with Gecko / Firefox and Blink / Chromium.

The HTML spec only maps the marginheight, topmargin, marginwidth and leftmargin
attributes on the body element to margin properties [1]. topmargin and 
marginheight
apply to both the top and bottom margins, and leftmargin and marginwidth apply 
to
both the left and right margins. WebKit also mapped the non-standard rightmargin
and bottommargin attributes to margin-right and margin-bottom, which this patch 
removes.

[1] https://html.spec.whatwg.org/multipage/rendering.html#the-page

* 
LayoutTests/imported/w3c/web-platform-tests/html/rendering/non-replaced-elements/the-page/body-margin-3a-expected.txt:
 Progression
* 
LayoutTests/imported/w3c/web-platform-tests/html/rendering/non-replaced-elements/the-page/body-margin-3b-expected.txt:
 Progression
* Source/WebCore/html/HTMLAttributeNames.in:
* Source/WebCore/html/HTMLBodyElement.cpp:
(WebCore::HTMLBodyElement::hasPresentationalHintsForAttribute const):
(WebCore::HTMLBodyElement::collectPresentationalHintsForAttribute):

Canonical link: https://commits.webkit.org/323444@main



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