[view-transitions] Skip view transition on hidden pages

https://bugs.webkit.org/show_bug.cgi?id=271248 rdar://125017653 Reviewed by Matt Woodrow. Follow: - https://drafts.csswg.org/css-view-transitions-1/#page-visibility-change-steps - w3c/csswg-drafts#9543 * LayoutTests/TestExpectations: * LayoutTests/imported/w3c/web-platform-tests/css/css-view-transitions/transition-in-hidden-page-expected.txt: * LayoutTests/imported/w3c/web-platform-tests/css/css-view-transitions/transition-in-hidden-page.html: * LayoutTests/imported/w3c/web-platform-tests/css/css-view-transitions/window-resize-aborts-transition-before-ready.html: * LayoutTests/imported/w3c/web-platform-tests/css/css-view-transitions/window-resize-aborts-transition.html: * LayoutTests/platform/ios/TestExpectations: * LayoutTests/platform/mac-wk2/TestExpectations: Remove duplicate test expectations to reduce confusion. * LayoutTests/platform/wpe/TestExpectations: * Source/WebCore/dom/Document.cpp: (WebCore::Document::visibilityStateChanged): Make this more robust to allow unregistering clients while iterating. (WebCore::Document::resolveViewTransitionRule): (WebCore::Document::reveal): (WebCore::Document::startViewTransition): * Source/WebCore/dom/ViewTransition.cpp: (WebCore::ViewTransition::ViewTransition): (WebCore::ViewTransition::stop): (WebCore::ViewTransition::visibilityStateChanged): * Source/WebCore/dom/ViewTransition.h: Canonical link: https://commits.webkit.org/283084@main
WebKit · Sep 3, 2024 · d985c51 · d985c51
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Showing 11 changed files with 50 additions and 13 deletions.
diff --git a/LayoutTests/TestExpectations b/LayoutTests/TestExpectations
@@ -7468,12 +7468,10 @@ imported/w3c/web-platform-tests/css/css-view-transitions/paint-holding-in-iframe
 imported/w3c/web-platform-tests/css/css-view-transitions/iframe-transition.sub.html [ Skip ]
 imported/w3c/web-platform-tests/css/css-view-transitions/fragmented-during-transition-skips.html [ Skip ]
 imported/w3c/web-platform-tests/css/css-view-transitions/root-element-display-none-during-transition-crash.html [ Skip ]
-imported/w3c/web-platform-tests/css/css-view-transitions/transition-in-hidden-page.html [ Skip ]
 
 # Flakes
 imported/w3c/web-platform-tests/css/css-view-transitions/synchronous-callback-skipped-before-run.html [ Failure Pass ]
 imported/w3c/web-platform-tests/css/css-view-transitions/old-content-intrinsic-aspect-ratio.html [ ImageOnlyFailure Pass ]
-imported/w3c/web-platform-tests/css/css-view-transitions/navigation/hide-before-reveal.html [ Failure Pass ]
 imported/w3c/web-platform-tests/css/css-view-transitions/navigation/pageswap-ctor.html [ Failure Pass ]
 
 # Reftests with variants are not supported
@@ -7494,6 +7492,7 @@ imported/w3c/web-platform-tests/css/css-view-transitions/navigation/chromium-pai
 imported/w3c/web-platform-tests/css/css-view-transitions/navigation/root-element-transition-iframe-with-startVT-on-main.html [ ImageOnlyFailure ]
 # https://github.com/w3c/csswg-drafts/issues/10800
 imported/w3c/web-platform-tests/css/css-view-transitions/navigation/pageswap-long-delay.html [ Failure ]
+webkit.org/b/278028 imported/w3c/web-platform-tests/css/css-view-transitions/navigation/hide-before-reveal.html [ Failure ]
 
 # prerender not supported.
 imported/w3c/web-platform-tests/css/css-view-transitions/navigation/prerender-removed-during-navigation.html [ Skip ]

diff --git a/...ed/w3c/web-platform-tests/css/css-view-transitions/transition-in-hidden-page-expected.txt b/...ed/w3c/web-platform-tests/css/css-view-transitions/transition-in-hidden-page-expected.txt
@@ -1,5 +1,5 @@
 
-FAIL A view transition should be immediately skipped if started when document is hidden assert_unreached: Should have rejected: undefined Reached unreachable code
-FAIL A view transition should be skipped when a document becomes hidden while processing update callback assert_equals: expected "rejected" but got "fulfilled"
-FAIL A view transition should be skipped when a document becomes hidden while animating assert_equals: expected "finished" but got "timeout"
+PASS A view transition should be immediately skipped if started when document is hidden
+PASS A view transition should be skipped when a document becomes hidden while processing update callback
+PASS A view transition should be skipped when a document becomes hidden while animating
 
diff --git a/...s/imported/w3c/web-platform-tests/css/css-view-transitions/transition-in-hidden-page.html b/...s/imported/w3c/web-platform-tests/css/css-view-transitions/transition-in-hidden-page.html
@@ -21,8 +21,8 @@
       await wsc.minimize();
       assert_true(document.hidden);
       const transition = document.startViewTransition();
-      await wsc.restore();
       await promise_rejects_dom(t, "InvalidStateError", transition.ready);
+      await wsc.restore();
     }, "A view transition should be immediately skipped if started when document is hidden");
 
     promise_test(async t => {

diff --git a/...platform-tests/css/css-view-transitions/window-resize-aborts-transition-before-ready.html b/...platform-tests/css/css-view-transitions/window-resize-aborts-transition-before-ready.html
@@ -34,6 +34,12 @@
       popup_win = window.open('about:blank', 'popup', 'width=300,height=300');
   });
 
+  if (popup_win.document.visibilityState == "hidden") {
+    await new Promise((resolve) => {
+      popup_win.document.addEventListener("visibilitychange", resolve, { once: true });
+    });
+  }
+
   // Resize the window while the update callback is running (i.e. before
   // capturing the new state).
   let transition = popup_win.document.startViewTransition(async () => {

diff --git a/...rted/w3c/web-platform-tests/css/css-view-transitions/window-resize-aborts-transition.html b/...rted/w3c/web-platform-tests/css/css-view-transitions/window-resize-aborts-transition.html
@@ -45,6 +45,12 @@
         html::view-transition-old(*) {animation-duration: 10s;opacity: 1;}
       </style>`;
 
+    if (popupDoc.visibilityState == "hidden") {
+      await new Promise((resolve) => {
+        popupDoc.addEventListener("visibilitychange", resolve, { once: true });
+      });
+    }
+
     // Start a transition inside the popup.
     let transition = popupDoc.startViewTransition(() => {
       popupDoc.documentElement.classList.add('new');

diff --git a/LayoutTests/platform/ios/TestExpectations b/LayoutTests/platform/ios/TestExpectations
@@ -1337,6 +1337,8 @@ fast/css/variables/env/ios [ Pass ]
 
 # Tests use resizable popups which are not a thing on iOS.
 imported/w3c/web-platform-tests/css/css-view-transitions/window-resize-aborts-transition-before-ready.html [ Failure ]
+imported/w3c/web-platform-tests/css/css-view-transitions/window-resize-aborts-transition.html [ Failure ]
+imported/w3c/web-platform-tests/css/css-view-transitions/transition-in-hidden-page.html [ Failure ]
 
 imported/w3c/web-platform-tests/css/css-view-transitions/navigation/hide-before-reveal.html [ Failure ]
 imported/w3c/web-platform-tests/css/css-view-transitions/navigation/pageswap-push-from-click.html [ Failure ]

diff --git a/LayoutTests/platform/mac-wk2/TestExpectations b/LayoutTests/platform/mac-wk2/TestExpectations
@@ -1789,9 +1789,6 @@ imported/w3c/web-platform-tests/css/css-view-transitions/new-content-intrinsic-a
 tiled-drawing/scrolling/overflow/overflow-scrolled-down-tile-coverage.html [ Pass Failure ]
 tiled-drawing/scrolling/overflow/overflow-scrolled-up-tile-coverage.html [ Pass Failure ]
 
-# rdar://133772823 ([Sonoma wk2] imported/w3c/web-platform-tests/css/css-view-transitions/navigation/hide-before-reveal.html is a flaky failure
-[ Sonoma+ ] imported/w3c/web-platform-tests/css/css-view-transitions/navigation/hide-before-reveal.html [ Pass Failure ]
-
 # webkit.org/b/278178  [macOS Debug] imported/w3c/web-platform-tests/css/cssom-view/scroll-behavior-smooth-positions.html is a flaky failure
 imported/w3c/web-platform-tests/css/cssom-view/scroll-behavior-smooth-positions.html [ Pass Failure ]
 

diff --git a/LayoutTests/platform/wpe/TestExpectations b/LayoutTests/platform/wpe/TestExpectations
@@ -1588,6 +1588,7 @@ compositing/visible-rect/scrolled.html [ Failure ]
 compositing/video/video-border-radius-clipping.html [ Pass ImageOnlyFailure ]
 
 imported/w3c/web-platform-tests/css/css-view-transitions/capture-with-visibility-mixed-descendants.html [ ImageOnlyFailure ]
+imported/w3c/web-platform-tests/css/css-view-transitions/transition-in-hidden-page.html [ Skip ]
 
 webkit.org/b/272224 imported/w3c/web-platform-tests/selection/textcontrols/selectionchange.html [ Failure ]
 

diff --git a/Source/WebCore/dom/Document.cpp b/Source/WebCore/dom/Document.cpp
@@ -2343,8 +2343,9 @@ void Document::visibilityStateChanged()
 {
     // https://w3c.github.io/page-visibility/#reacting-to-visibilitychange-changes
     queueTaskToDispatchEvent(TaskSource::UserInteraction, Event::create(eventNames().visibilitychangeEvent, Event::CanBubble::Yes, Event::IsCancelable::No));
-    for (auto& client : m_visibilityStateCallbackClients)
+    m_visibilityStateCallbackClients.forEach([](auto& client) {
         client.visibilityStateChanged();
+    });
 
 #if ENABLE(MEDIA_STREAM) && PLATFORM(IOS_FAMILY)
     if (auto mediaSessionManager = PlatformMediaSessionManager::sharedManagerIfExists()) {
@@ -8068,7 +8069,7 @@ void Document::dispatchPagehideEvent(PageshowEventPersistence persisted)
 // https://www.w3.org/TR/css-view-transitions-2/#vt-rule-algo
 std::variant<Document::SkipTransition, Vector<AtomString>> Document::resolveViewTransitionRule()
 {
-    if (visibilityState() == VisibilityState::Hidden)
+    if (hidden())
         return SkipTransition { };
 
     auto rule = styleScope().resolver().viewTransitionRule();
@@ -8089,7 +8090,7 @@ void Document::reveal()
 
     PageRevealEvent::Init init;
 
-    RefPtr<ViewTransition> inboundTransition = ViewTransition::resolveInboundCrossDocumentViewTransition(*this, std::exchange(m_inboundViewTransitionParams, nullptr));
+    RefPtr inboundTransition = ViewTransition::resolveInboundCrossDocumentViewTransition(*this, std::exchange(m_inboundViewTransitionParams, nullptr));
     if (inboundTransition)
         init.viewTransition = inboundTransition;
 
@@ -10828,6 +10829,7 @@ void Document::flushDeferredRenderingIsSuppressedForViewTransitionChanges()
     }
 }
 
+// https://drafts.csswg.org/css-view-transitions/#ViewTransition-prepare
 RefPtr<ViewTransition> Document::startViewTransition(StartViewTransitionCallbackOptions&& callbackOptions)
 {
     if (!globalObject())
@@ -10851,6 +10853,11 @@ RefPtr<ViewTransition> Document::startViewTransition(StartViewTransitionCallback
 
     Ref viewTransition = ViewTransition::createSamePage(*this, WTFMove(updateCallback), WTFMove(activeTypes));
 
+    if (hidden()) {
+        viewTransition->skipViewTransition(Exception { ExceptionCode::InvalidStateError, "View transition was skipped because document visibility state is hidden."_s });
+        return viewTransition;
+    }
+
     if (RefPtr activeViewTransition = m_activeViewTransition)
         activeViewTransition->skipViewTransition(Exception { ExceptionCode::AbortError, "Old view transition aborted by new view transition."_s });
 

diff --git a/Source/WebCore/dom/ViewTransition.cpp b/Source/WebCore/dom/ViewTransition.cpp
@@ -68,6 +68,7 @@ ViewTransition::ViewTransition(Document& document, RefPtr<ViewTransitionUpdateCa
     , m_finished(createPromiseAndWrapper(document))
     , m_types(ViewTransitionTypeSet::create(document, WTFMove(initialActiveTypes)))
 {
+    document.registerForVisibilityStateChangedCallbacks(*this);
 }
 
 ViewTransition::ViewTransition(Document& document, Vector<AtomString>&& initialActiveTypes)
@@ -859,12 +860,26 @@ RenderViewTransitionCapture* ViewTransition::viewTransitionNewPseudoForCapturedE
     return nullptr;
 }
 
+// https://drafts.csswg.org/css-view-transitions/#page-visibility-change-steps
+void ViewTransition::visibilityStateChanged()
+{
+    if (!document())
+        return;
+
+    if (protectedDocument()->hidden()) {
+        if (protectedDocument()->activeViewTransition() == this)
+            skipViewTransition(Exception { ExceptionCode::InvalidStateError, "Skipping view transition because document visibility state has become hidden."_s });
+    } else
+        ASSERT(!protectedDocument()->activeViewTransition());
+}
+
 void ViewTransition::stop()
 {
     if (!document())
         return;
 
     m_phase = ViewTransitionPhase::Done;
+    document()->unregisterForVisibilityStateChangedCallbacks(*this);
 
     if (document()->activeViewTransition() == this)
         clearViewTransition();

diff --git a/Source/WebCore/dom/ViewTransition.h b/Source/WebCore/dom/ViewTransition.h
@@ -35,6 +35,7 @@
 #include "Styleable.h"
 #include "ViewTransitionTypeSet.h"
 #include "ViewTransitionUpdateCallback.h"
+#include "VisibilityChangeClient.h"
 #include <wtf/CheckedRef.h>
 #include <wtf/Ref.h>
 #include <wtf/TZoneMalloc.h>
@@ -150,7 +151,7 @@ struct ViewTransitionParams {
     float initialPageZoom;
 };
 
-class ViewTransition : public RefCounted<ViewTransition>, public CanMakeWeakPtr<ViewTransition>, public ActiveDOMObject {
+class ViewTransition : public RefCounted<ViewTransition>, public VisibilityChangeClient, public ActiveDOMObject {
     WTF_MAKE_TZONE_ALLOCATED(ViewTransition);
 public:
     static Ref<ViewTransition> createSamePage(Document&, RefPtr<ViewTransitionUpdateCallback>&&, Vector<AtomString>&&);
@@ -208,6 +209,9 @@ class ViewTransition : public RefCounted<ViewTransition>, public CanMakeWeakPtr<
 
     void clearViewTransition();
 
+    // VisibilityChangeClient.
+    void visibilityStateChanged() final;
+
     // ActiveDOMObject.
     void stop() final;