Created attachment 269976 [details] testcase ###!!! ASSERTION: illegal height for mtable: 'aDesiredSize.height >= 0', file /Users/jruderman/trunk/mozilla/layout/mathml/base/src/nsMathMLmtableFrame.cpp, line 562
Still happens on trunk.
@Jesse Ruderman Please contribute a step by step instruction how to reproduce the problem.
Steps were presumably just "load attached testcase in a debug build". (Jesse's testcases are generally self-contained & just need to be loaded; and note that assertions only happen in debug builds.) Good news: currently, this bug's testcase does not trigger any assertions for me (in a debug build), on Linux at least. Jesse, do you still get any assertions? If not, I think this is WORKSFORME.
Summary: "ASSERTION: illegal height for mtable" with display: table-caption, negative margin → In Debug Builds: "ASSERTION: illegal height for mtable" with display: table-caption, negative margin
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