When running in the content_shell like this new-run-webkit-tests --chromium --debug --driver-name=content_shell --additional-drt-flag=--dump-render-tree --additional-drt-flag=--no-sandbox fast/dom/shadow/shadowdom-for-progress-dynamic.html I get the following crash: STDERR: base::debug::StackTrace::StackTrace() [0x51829e] STDERR: base::(anonymous namespace)::StackDumpSignalHandler() [0x5318c4] STDERR: 0x7f27e5ffdaf0 STDERR: WebCore::ElementAttributeData::isMutable() [0x1e8dc1a] STDERR: WebCore::Element::mutableAttributeData() [0x2772a16] STDERR: WebCore::StyledElement::ensureInlineStyle() [0x2771b1f] STDERR: WebCore::StyledElement::setInlineStyleProperty() [0x315afab] STDERR: WebCore::ProgressValueElement::setWidthPercentage() [0x2ea587e] STDERR: WebCore::HTMLProgressElement::didElementStateChange() [0x2de261d] STDERR: WebCore::HTMLProgressElement::parseAttribute() [0x2de2586] STDERR: WebCore::Element::attributeChanged() [0x30c6d99] STDERR: WebCore::StyledElement::attributeChanged() [0x315ac29] STDERR: WebCore::Element::didModifyAttribute() [0x30cce76] STDERR: WebCore::Element::setAttributeInternal() [0x30ce836] STDERR: WebCore::Element::setAttribute() [0x30c6cf8] STDERR: WebCore::ElementV8Internal::setAttributeCallback() [0x34bd1c8] STDERR: v8::internal::HandleApiCallHelper<>() [0x16a7a05] STDERR: v8::internal::Builtin_Impl_HandleApiCall() [0x16a75e3] STDERR: v8::internal::Builtin_HandleApiCall() [0x16a116c] STDERR: 0x5eab750618e Tracked in chromium here: http://code.google.com/p/chromium/issues/detail?id=155474
It looks like the progress element's guts aren't being initialized properly.
Marked LayoutTest bugs, bugs with Chromium IDs, and some others as WontFix. Test failure bugs still are trackable via TestExpectations or disabled unit tests.