Created attachment 449512 [details] testcase ###!!! ASSERTION: ComputeLineHeight screwed up: 'lineHeight >= 0', file /Users/jruderman/central/layout/generic/nsHTMLReflowState.cpp, line 2143 It seems this only happens with the "number" version of the line-height property. Seemingly-equivalent percent and em-unit values do not trigger the assertion failure.
Still happens on trunk.
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