Created attachment 8896361 [details] no-grid-header.gif STR (see attached screencast): Load https://www.mozilla.org/en-US/developer/css-grid/ Open layout panel Tick the checkbox for div.content.grid-content Scroll that node into the top of the viewport Hover one of the sections in the top row of the grid outline Expected: See a header in the page for `Row 1 / Column N` Actual: No header. It does work on row 2.
status-firefox57: --- → fix-optional
Priority: -- → P2
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