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http://lists.w3.org/Archives/Public/public-css-testsuite/2012Nov/0054.html
Safari and Chrome pass the suggested test case: | div { line-height: 0;} span { margin:0 1px; line-height: normal; } | <div id=test>x<span></span></div> | <div id=ref>x</div><div id=s_ref>x<span>x</span></div> [[ In other words, I guess the best option is to spec the quirk about "zero-height line boxes" and include both test cases. ]] I don't know what to spec here. If I'm missing something and the spec should change, please elaborate. I've added the test case.
dbaron: Do you know anything about this quirk?