The IE test center has several page visibility tests, of which we are failing 3 because we do not expose the PAGE_HIDDEN, PAGE_VISIBLE, PAGE_PREVIEW string constants (or rather the WEBKIT_* prefixed versions of those). Failing tests: http://samples.msdn.microsoft.com/ietestcenter/WebPerf/PageVisibility/test_api_exists_attributes.htm http://samples.msdn.microsoft.com/ietestcenter/WebPerf/PageVisibility/test_read_only_conformance_attributes.htm http://samples.msdn.microsoft.com/ietestcenter/WebPerf/PageVisibility/test_iframe_attributes.htm Spec: http://www.w3.org/TR/page-visibility/#sec-document-visibility-interface
The constants seem to be gone from the latest editor's draft. It didn't make sense having string constants anyway. https://dvcs.w3.org/hg/webperf/raw-file/tip/specs/PageVisibility/Overview.html#sec-document-visibility-interface
(In reply to comment #1) > The constants seem to be gone from the latest editor's draft. It didn't make sense having string constants anyway. > > https://dvcs.w3.org/hg/webperf/raw-file/tip/specs/PageVisibility/Overview.html#sec-document-visibility-interface Thanks. I missed that update. Instead, I'll try to let someone at MS know the tests are out of date.