The testcase and reference have identical DOMs, so they should look the same. (This happens with both -moz-grid and -moz-grid-group.)
I'm surprised it works at all. We only recently started supporting arbitrary inline elements in XUL, but I don't remember why.
Same thing happens with -moz-box as well (including <xul:hbox>).
Component: XP Toolkit/Widgets: XUL → XUL
QA Contact: xptoolkit.xul → xptoolkit.widgets
Fixed by the checkin for bug 484448. Tests added.
Status: NEW → RESOLVED
Last Resolved: 9 years ago
Resolution: --- → FIXED
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