[Webkit-unassigned] [Bug 236470] `contain:content` breaks fullscreen

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=236470

--- Comment #3 from zalan <zalan at apple.com> ---
diff --git a/Source/WebCore/css/fullscreen.css b/Source/WebCore/css/fullscreen.css
index c2a71ca3ceda..b67ed6ee0d01 100644
--- a/Source/WebCore/css/fullscreen.css
+++ b/Source/WebCore/css/fullscreen.css
@@ -48,6 +48,7 @@
   perspective: none !important;
   -webkit-transform-style: flat !important;
   overflow: visible !important;
+  contain: none !important;
 }

 video:-webkit-full-screen, audio:-webkit-full-screen {
diff --git a/Source/WebCore/css/parser/CSSParserContext.cpp b/Source/WebCore/css/parser/CSSParserContext.cpp
index 55d36bb58616..f6b19755e2ea 100644
--- a/Source/WebCore/css/parser/CSSParserContext.cpp
+++ b/Source/WebCore/css/parser/CSSParserContext.cpp
@@ -51,6 +51,7 @@ CSSParserContext::CSSParserContext(CSSParserMode mode, const URL& baseURL)
     individualTransformPropertiesEnabled = true;
     focusVisibleEnabled = true;
     inputSecurityEnabled = true;
+    containmentEnabled = true;
 #if ENABLE(CSS_TRANSFORM_STYLE_OPTIMIZED_3D)
     transformStyleOptimized3DEnabled = true;
 #endif

will submit a patch once I figured out how to test fullscreen.

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