The following layout test is failing on Chromium media/track/track-css-matching-lang.html Probable cause: Added in r140874. crash log for DumpRenderTree (pid 3605): STDOUT: <empty> STDERR: objc[3605]: Class MockCrApp is implemented in both /Volumes/data/b/build/slave/WebKit_Mac10_6__dbg_/build/src/xcodebuild/Debug/libwebkit.dylib and /Volumes/data/b/build/slave/WebKit_Mac10_6__dbg_/build/src/xcodebuild/Debug/DumpRenderTree.app/Contents/MacOS/DumpRenderTree. One of the two will be used. Which one is undefined. STDERR: ASSERTION FAILED: !element || element->isHTMLUnknownElement() STDERR: ../../third_party/WebKit/Source/WebCore/html/HTMLUnknownElement.h(57) : WebCore::HTMLUnknownElement *WebCore::toHTMLUnknownElement(WebCore::HTMLElement *) STDERR: 1 0x2c038b9f WebCore::toHTMLUnknownElement(WebCore::HTMLElement*) STDERR: 2 0x2c035fa9 WebCore::createV8HTMLWrapper(WebCore::HTMLElement*, v8::Handle<v8::Object>, v8::Isolate*) STDERR: 3 0x2cbad3b4 WebCore::wrap(WebCore::HTMLElement*, v8::Handle<v8::Object>, v8::Isolate*) STDERR: 4 0x2cb96344 WebCore::wrap(WebCore::Element*, v8::Handle<v8::Object>, v8::Isolate*) STDERR: 5 0x2ba50e94 v8::Handle<v8::Value> WebCore::toV8Fast<v8::AccessorInfo, WebCore::Element>(WebCore::Element*, v8::AccessorInfo const&, WebCore::Element*) STDERR: 6 0x2b9e30b8 WebCore::ElementV8Internal::firstElementChildAttrGetter(v8::Local<v8::String>, v8::AccessorInfo const&) STDERR: 7 0x260ac840 v8::internal::JSObject::GetPropertyWithCallback(v8::internal::Object*, v8::internal::Object*, v8::internal::String*) STDERR: 8 0x260ac339 v8::internal::Object::GetProperty(v8::internal::Object*, v8::internal::LookupResult*, v8::internal::String*, PropertyAttributes*) STDERR: 9 0x25fef4da v8::internal::LoadIC::Load(v8::internal::InlineCacheState, v8::internal::Handle<v8::internal::Object>, v8::internal::Handle<v8::internal::String>) STDERR: 10 0x25ff535e v8::internal::LoadIC_Miss(v8::internal::Arguments, v8::internal::Isolate*) STDERR: 11 0x33b0a216 STDERR: Received signal 11 SEGV_MAPERR 0000bbadbeef STDERR: [0x000028d8f22f] STDERR: [0x000028d8f1cb] STDERR: [0x000028d8ee5b] STDERR: [0x000097bb505b] STDERR: [0x0000ffffffff] STDERR: [0x00002c035fa9] STDERR: [0x00002cbad3b4] STDERR: [0x00002cb96344] STDERR: [0x00002ba50e94] STDERR: [0x00002b9e30b8] STDERR: [0x0000260ac840] STDERR: [0x0000260ac339] STDERR: [0x000025fef4da] STDERR: [0x000025ff535e] STDERR: [0x000033b0a216] STDERR: ax: bbadbeef, bx: 6f697b00, cx: 6f697bd4, dx: 6f697bd4 STDERR: di: 2d969e93, si: 2d969e40, bp: bfffa6e8, sp: bfffa6b0, ss: 23, flags: 10282 STDERR: ip: 2c038ba9, cs: 1b, ds: 23, es: 23, fs: 0, gs: f
I think, since Source/WebCore/html/HTMLTagNames.in is not updated, default create wrapper is used for WebVTTElement. WebVTTElement is not unknown. So ASSERT fails.
*** This bug has been marked as a duplicate of bug 107579 ***