We have these 2 tests (Ahem font must be installed on your system) http://www.gtalbot.org/BrowserBugsSection/css21testsuite/containing-block-031.html http://www.gtalbot.org/BrowserBugsSection/css21testsuite/containing-block-032.html that can be adjusted to be submitted to WPT once Issue 8284 https://github.com/w3c/csswg-drafts/issues/8284 is resolved. I think bug 489207 and bug 743599 should be resolved as DUPLICATEs.
Bug 489100 Comment 29 Edit History
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We have these 2 tests (Ahem font must be installed on your system) http://www.gtalbot.org/BrowserBugsSection/css21testsuite/containing-block-031.html http://www.gtalbot.org/BrowserBugsSection/css21testsuite/containing-block-032.html that can be adjusted to be submitted to WPT once Issue 8284 https://github.com/w3c/csswg-drafts/issues/8284 is resolved. [Edit] I am really eager to submit these because we have been keeping these for over 13 years now: https://lists.w3.org/Archives/Public/public-css-testsuite/2010Jul/0046.html [/Edit] I think bug 489207 and bug 743599 should be resolved as DUPLICATEs.