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[AutoSizing] Resolve viewport units against the preferred content size https://bugs.webkit.org/show_bug.cgi?id=213408 <rdar://problem/64267539> Reviewed by Tim Horton. Source/WebCore: Instead of resolving the viewport units against the maximum content size constraints, let's use the preferred content size. It ensures that content with vw, vh units does not grow beyond the preferred content size. Test: fast/dynamic/size-to-content-autosize-with-viewport-units.html * page/FrameView.cpp: (WebCore::FrameView::performSizeToContentAutoSize): (WebCore::FrameView::enableAutoSizeMode): Let's "ignore" viewport units during the initial pass and use the preferred width to finalize the vw vh unit values (we don't really ignore them, but they are resolved against a [ 1, 1 ] viewport). This approach fails if the main content has 100vw with overflow hidden. Such content would end up with a [ 1, 1 ] size (we might want to detect it and resolved the values against the horizontal constraint). (WebCore::FrameView::overrideViewportWidthForCSSViewportUnits): (WebCore::FrameView::resetOverriddenViewportWidthForCSSViewportUnits): * page/FrameView.h: * testing/Internals.cpp: (WebCore::Internals::enableSizeToContentAutoSizeMode): * testing/Internals.h: * testing/Internals.idl: LayoutTests: * fast/dynamic/size-to-content-autosize-with-viewport-units-expected.txt: Added. * fast/dynamic/size-to-content-autosize-with-viewport-units.html: Added. Canonical link: https://commits.webkit.org/226217@main git-svn-id: https://svn.webkit.org/repository/webkit/trunk@263311 268f45cc-cd09-0410-ab3c-d52691b4dbfc

2020-06-20 02:44:55 +00:00

350px 175px 35px 0px