I am not sure what change caused it, or if this is the first instance of flakiness: http://build.webkit.org/builders/SnowLeopard%20Intel%20Release%20%28WebKit2%20Tests%29/builds/10280 http://build.webkit.org/results/SnowLeopard%20Intel%20Release%20(WebKit2%20Tests)/r82685%20(10281)/results.html The test itself was added in http://trac.webkit.org/changeset/82252. Some change sets that look suspicious: http://trac.webkit.org/changeset/82683 http://trac.webkit.org/changeset/82685
It's not due to (82681,82685], it started to flake on chromium bots like a month ago with the same text diff. http://test-results.appspot.com/dashboards/flakiness_dashboard.html#group=%40ToT%20-%20chromium.org&tests=inspector%2Fstyles%2Fstyles-add-blank-property.html See also http://code.google.com/p/chromium/issues/detail?id=75121.
... and it doesn't fail uniformly in subsequent runs on SL WK2.
I am going to add styles-add-blank-property.html to the mac-wk2 skipped list, since it is flaking again: http://build.webkit.org/results/SnowLeopard%20Intel%20Release%20(WebKit2%20Tests)/r83460%20(10576)/inspector/styles/styles-add-blank-property-pretty-diff.html
Added to the mac-wk2 skipped list in http://trac.webkit.org/changeset/83481
<rdar://problem/9273903>
This test has been stable lately, and is absent from the Mac-WK2 Skipped list at the moment.