Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 824d434d74a36754b75566c9939b0aef46e21757
      
https://github.com/WebKit/WebKit/commit/824d434d74a36754b75566c9939b0aef46e21757
  Author: Elika Etemad <[email protected]>
  Date:   2026-09-05 (Sat, 05 Sep 2026)

  Changed paths:
    M LayoutTests/css3/parse-align-items.html
    M 
LayoutTests/imported/w3c/web-platform-tests/css/css-align/abspos/safe-align-self-htb.html
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LayoutTests/imported/w3c/web-platform-tests/css/css-align/abspos/safe-align-self-vlr.html
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LayoutTests/imported/w3c/web-platform-tests/css/css-align/abspos/safe-justify-self-htb.html
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LayoutTests/imported/w3c/web-platform-tests/css/css-align/parsing/align-items-computed-expected.txt
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LayoutTests/imported/w3c/web-platform-tests/css/css-align/parsing/justify-self-valid.html
    M 
LayoutTests/imported/w3c/web-platform-tests/css/css-align/parsing/place-items-computed-expected.txt
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LayoutTests/imported/w3c/web-platform-tests/css/css-align/parsing/place-items-computed.html
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    M 
LayoutTests/imported/w3c/web-platform-tests/html/semantics/forms/the-select-element/customizable-select/update.css
    M Source/WebCore/css/CSSProperties.json
    M Source/WebCore/css/html.css
    M Source/WebCore/css/parser/CSSPropertyParserConsumer+Align.cpp
    M Source/WebCore/rendering/PositionedLayoutConstraints.cpp
    M Source/WebCore/style/values/align/StyleAlignItems.cpp
    M Source/WebCore/style/values/align/StyleAlignItems.h
    M Source/WebCore/style/values/align/StyleAlignSelf.cpp
    M Source/WebCore/style/values/align/StyleAlignSelf.h
    M Source/WebCore/style/values/align/StyleJustifyItems.cpp
    M Source/WebCore/style/values/align/StyleJustifyItems.h
    M Source/WebCore/style/values/align/StyleJustifySelf.cpp
    M Source/WebCore/style/values/align/StyleJustifySelf.h

  Log Message:
  -----------
  Keep base appearance select popover in view by using 'safe' alignment
https://bugs.webkit.org/show_bug.cgi?id=322683
rdar://185952139

Reviewed by Alan Baradlay.

The <select> picker currently uses the default overflow alignment safety,
which honors the preferred alignment as long as it can be scrolled to.
However for <select> pickers, we want to prioritize keeping them in view,
even if that would mean spilling out of their 'position-area' by overlapping
the <select> button itself when they are too tall to fit on either side of
the button.

This patch implements the 'safe' alignment behavior recently specified for
fixed positioned boxes (because of this issue) in PositionedLayoutConstraints,
and applies it to the <select> picker in our UA style sheet.

See CSSWG discussion in:
  https://github.com/w3c/csswg-drafts/issues/14172
  https://github.com/w3c/csswg-drafts/issues/14008
  https://github.com/w3c/csswg-drafts/issues/12920

* LayoutTests/css3/parse-align-items.html:
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LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/position-area-overflow-icb-006-ltr-ref.html:
 Copied from 
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/position-area-overflow-icb-003-ref.html.
* 
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/position-area-overflow-icb-006-ltr.html:
 Copied from 
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/position-area-overflow-icb-004.html.
* 
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/position-area-overflow-icb-006-rtl-expected.html:
 Copied from 
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/position-area-overflow-icb-003-ref.html.
* 
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/position-area-overflow-icb-006-rtl-ref.html:
 Renamed from 
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/position-area-overflow-icb-003-ref.html.
* 
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/position-area-overflow-icb-006-rtl.html:
 Copied from 
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/position-area-overflow-icb-004.html.
* 
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/position-area-overflow-icb-007-ltr-expected.html:
 Added.
* 
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/position-area-overflow-icb-007-ltr-ref.html:
 Added.
* 
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/position-area-overflow-icb-007-ltr.html:
 Copied from 
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/position-area-overflow-icb-004.html.
* 
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/position-area-overflow-icb-007-rtl-expected.html:
 Added.
* 
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/position-area-overflow-icb-007-rtl-ref.html:
 Added.
* 
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/position-area-overflow-icb-007-rtl.html:
 Renamed from 
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/position-area-overflow-icb-003.html.
* 
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/position-area-overflow-icb-008-ltr-expected.html:
 Added.
* 
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/position-area-overflow-icb-008-ltr-ref.html:
 Added.
* 
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/position-area-overflow-icb-008-ltr.html:
 Copied from 
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/position-area-overflow-icb-004.html.
* 
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/position-area-overflow-icb-008-rtl-expected.html:
 Added.
* 
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/position-area-overflow-icb-008-rtl-ref.html:
 Added.
* 
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/position-area-overflow-icb-008-rtl.html:
 Renamed from 
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/position-area-overflow-icb-004.html.
* 
LayoutTests/imported/w3c/web-platform-tests/css/css-grid/abspos/grid-abspos-staticpos-align-self-safe-001-expected.html:
* 
LayoutTests/imported/w3c/web-platform-tests/css/css-grid/abspos/grid-abspos-staticpos-align-self-safe-001-ref.html:
* 
LayoutTests/imported/w3c/web-platform-tests/html/semantics/forms/the-select-element/customizable-select/update.css:
(select::picker(select),):
* Source/WebCore/css/CSSProperties.json:
* Source/WebCore/css/html.css:
(:-internal-select-popover):
* Source/WebCore/css/parser/CSSPropertyParserConsumer+Align.cpp:
(WebCore::CSSPropertyParserHelpers::consumeAlignSelf):
(WebCore::CSSPropertyParserHelpers::consumeJustifySelf):
(WebCore::CSSPropertyParserHelpers::consumeAlignItems):
(WebCore::CSSPropertyParserHelpers::consumeJustifyItems):
* Source/WebCore/rendering/PositionedLayoutConstraints.cpp:
(WebCore::PositionedLayoutConstraints::resolveAlignmentShift const):
* Source/WebCore/style/values/align/StyleAlignItems.cpp:
(WebCore::Style::AlignItems::resolve const):
(WebCore::Style::CSSValueConversion<AlignItems>::operator):
* Source/WebCore/style/values/align/StyleAlignItems.h:
(WebCore::Style::AlignItems::AlignItems):
(WebCore::Style::AlignItems::canHaveOverflowPosition):
(WebCore::Style::AlignItems::switchOn const):
* Source/WebCore/style/values/align/StyleAlignSelf.cpp:
(WebCore::Style::AlignSelf::resolve const):
(WebCore::Style::CSSValueConversion<AlignSelf>::operator):
* Source/WebCore/style/values/align/StyleAlignSelf.h:
(WebCore::Style::AlignSelf::AlignSelf):
(WebCore::Style::AlignSelf::canHaveOverflowPosition):
(WebCore::Style::AlignSelf::switchOn const):
* Source/WebCore/style/values/align/StyleJustifyItems.cpp:
(WebCore::Style::JustifyItems::resolve const):
(WebCore::Style::CSSValueConversion<JustifyItems>::operator):
* Source/WebCore/style/values/align/StyleJustifyItems.h:
(WebCore::Style::JustifyItems::JustifyItems):
(WebCore::Style::JustifyItems::canHaveOverflowPosition):
(WebCore::Style::JustifyItems::switchOn const):
* Source/WebCore/style/values/align/StyleJustifySelf.cpp:
(WebCore::Style::JustifySelf::resolve const):
(WebCore::Style::CSSValueConversion<JustifySelf>::operator):
* Source/WebCore/style/values/align/StyleJustifySelf.h:
(WebCore::Style::JustifySelf::JustifySelf):
(WebCore::Style::JustifySelf::canHaveOverflowPosition):
(WebCore::Style::JustifySelf::switchOn const):

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