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[webkit-changes] [WebKit/WebKit] c39e3b: Propagate
attribute changes int...</span></a></span> </h1> <p class="darkgray font13"> <span class="sender pipe"><a href="/search?l=webkit-changes@lists.webkit.org&q=from:%22Cameron+McCormack%22" rel="nofollow"><span itemprop="author" itemscope itemtype="http://schema.org/Person"><span itemprop="name">Cameron McCormack</span></span></a></span> <span class="date"><a href="/search?l=webkit-changes@lists.webkit.org&q=date:20260926" rel="nofollow">Sat, 26 Sep 2026 13:23:41 -0700</a></span> </p> </div> <div itemprop="articleBody" class="msgBody"> <!--X-Body-of-Message--> <pre> Branch: refs/heads/main Home: <a rel="nofollow" href="https://github.com/WebKit/WebKit">https://github.com/WebKit/WebKit</a> Commit: c39e3bbd953988fd6c963873ba3c6e53cde93d8f <a rel="nofollow" href="https://github.com/WebKit/WebKit/commit/c39e3bbd953988fd6c963873ba3c6e53cde93d8f">https://github.com/WebKit/WebKit/commit/c39e3bbd953988fd6c963873ba3c6e53cde93d8f</a> Author: Cameron McCormack <hey...@apple.com> Date: 2026-09-26 (Sat, 26 Sep 2026)</pre><pre> Changed paths: M LayoutTests/http/tests/site-isolation/compositing/iframes/iframe-scrolling-change-expected.txt M LayoutTests/http/tests/site-isolation/compositing/iframes/iframe-scrolling-change.html M LayoutTests/platform/ios/TestExpectations A LayoutTests/platform/ios/compositing/iframes/iframe-scrolling-change-expected.txt A LayoutTests/scrollingcoordinator/scrolling-tree/frame-scrolling-attribute-change-expected.txt A LayoutTests/scrollingcoordinator/scrolling-tree/frame-scrolling-attribute-change.html M Source/WebCore/page/LocalFrameView.cpp M Source/WebCore/page/LocalFrameView.h M Source/WebCore/platform/ScrollView.cpp M Source/WebCore/platform/ScrollView.h Log Message: ----------- Propagate <iframe scrolling> attribute changes into the frame proactively <a rel="nofollow" href="https://bugs.webkit.org/show_bug.cgi?id=325198">https://bugs.webkit.org/show_bug.cgi?id=325198</a> rdar://188326221 Reviewed by Matt Woodrow. Rather than wait for scrollbars to appear, causing a relayout, which then correctly updates the scrolling mode of the document. Otherwise, when overlay scrollbars are used, we won't respond to the attribute change immediately. * LayoutTests/http/tests/site-isolation/compositing/iframes/iframe-scrolling-change-expected.txt: * LayoutTests/http/tests/site-isolation/compositing/iframes/iframe-scrolling-change.html: * LayoutTests/platform/ios/TestExpectations: * LayoutTests/scrollingcoordinator/scrolling-tree/frame-scrolling-attribute-change-expected.txt: Added. * LayoutTests/scrollingcoordinator/scrolling-tree/frame-scrolling-attribute-change.html: Added. * Source/WebCore/page/LocalFrameView.cpp: (WebCore::LocalFrameView::scrollbarModesDidChange): * Source/WebCore/page/LocalFrameView.h: * Source/WebCore/platform/ScrollView.cpp: (WebCore::ScrollView::setScrollbarModes): * Source/WebCore/platform/ScrollView.h: (WebCore::ScrollView::scrollbarModesDidChange): * LayoutTests/platform/ios/compositing/iframes/iframe-scrolling-change-expected.txt: Copied from LayoutTests/http/tests/site-isolation/compositing/iframes/iframe-scrolling-change-expected.txt. 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