[Webkit-unassigned] [Bug 273364] pral.com.pk - Double bounce animation compared to other browsers

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=273364

--- Comment #10 from Antoine Quint <graouts at webkit.org> ---
This is the stack when the `transitioncancel` event gets triggered:

#0      0x000000014ed4dc70 in WebCore::StyleOriginatedAnimation::cancelFromStyle(WebCore::WebAnimation::Silently) at ~/Source/WebCore/animation/StyleOriginatedAnimation.cpp:223
#1      0x0000000151aac230 in WebCore::Styleable::cancelStyleOriginatedAnimations(WTF::Vector<WTF::WeakPtr<WebCore::StyleOriginatedAnimation, WebCore::WeakPtrImplWithEventTargetData, WTF::RawPtrTraits<WebCore::WeakPtrImplWithEventTargetData>>, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc> const&) const at ~/Source/WebCore/style/Styleable.cpp:311
#2      0x00000001519d138c in WebCore::RenderTreeUpdater::tearDownRenderers(WebCore::Element&, WebCore::RenderTreeUpdater::TeardownType, WebCore::RenderTreeBuilder&)::$_1::operator()(unsigned int) const at ~/Source/WebCore/rendering/updating/RenderTreeUpdater.cpp:726
#3      0x00000001519cfd84 in WebCore::RenderTreeUpdater::tearDownRenderers(WebCore::Element&, WebCore::RenderTreeUpdater::TeardownType, WebCore::RenderTreeBuilder&) at ~/Source/WebCore/rendering/updating/RenderTreeUpdater.cpp:774
#4      0x00000001519d0fac in WebCore::RenderTreeUpdater::tearDownRenderers(WebCore::Element&) at ~/Source/WebCore/rendering/updating/RenderTreeUpdater.cpp:667
#5      0x000000014f86f0b4 in WebCore::Element::addShadowRoot(WTF::Ref<WebCore::ShadowRoot, WTF::RawPtrTraits<WebCore::ShadowRoot>, WTF::DefaultRefDerefTraits<WebCore::ShadowRoot>>&&) at ~/Source/WebCore/dom/Element.cpp:2870
#6      0x000000014f881af4 in WebCore::Element::createUserAgentShadowRoot() at ~/Source/WebCore/dom/Element.cpp:3028
#7      0x000000014f881a0c in WebCore::Element::ensureUserAgentShadowRoot() at ~/Source/WebCore/dom/Element.cpp:3020
#8      0x000000014f927b7c in WebCore::ImageOverlay::updateSubtree(WebCore::HTMLElement&, WebCore::TextRecognitionResult const&) at ~/Source/WebCore/dom/ImageOverlay.cpp:377
#9      0x000000014f926404 in WebCore::ImageOverlay::updateWithTextRecognitionResult(WebCore::HTMLElement&, WebCore::TextRecognitionResult const&, WebCore::ImageOverlay::CacheTextRecognitionResults) at ~/Source/WebCore/dom/ImageOverlay.cpp:493
#10     0x0000000119ca0a24 in auto WebKit::WebPage::requestTextRecognition(WebCore::Element&, WebCore::TextRecognitionOptions&&, WTF::CompletionHandler<void (WTF::RefPtr<WebCore::Element, WTF::RawPtrTraits<WebCore::Element>, WTF::DefaultRefDerefTraits<WebCore::Element>>&&)>&&)::$_1::operator()<WebCore::TextRecognitionResult>(WebCore::TextRecognitionResult&&) const at ~/Source/WebKit/WebProcess/WebPage/WebPage.cpp:8848

So that's why this is specific to <img>, we're adding a shadow root to that element when text is recognized within that image. I presume this only happens when the cursor is over that image.

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