User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:63.0) Gecko/20100101 Firefox/63.0 Steps to reproduce: 1- Load the attached test case Actual results: The first column item's content overflows over the one placed in the second column, despite both tracks are auto sized. (see baseline-orthogonal-issue-expected.png) Expected results: The size of the column tracks consider the baseline shims derived from the baseline alignment, avoiding any kind of content overflow (see baseline-orthogonal-issue-actual.png)

This issue is one of the causes of the failures detected in the following Web Platform Tests: https://github.com/web-platform-tests/wpt/blob/master/css/css-grid/alignment/self-baseline/grid-self-baseline-changes-grid-area-size-007.html https://github.com/web-platform-tests/wpt/blob/master/css/css-grid/alignment/self-baseline/grid-self-baseline-changes-grid-area-size-008.html https://github.com/web-platform-tests/wpt/blob/master/css/css-grid/alignment/self-baseline/grid-self-baseline-changes-grid-area-size-009.html https://github.com/web-platform-tests/wpt/blob/master/css/css-grid/alignment/self-baseline/grid-self-baseline-changes-grid-area-size-010.html https://github.com/web-platform-tests/wpt/blob/master/css/css-grid/alignment/self-baseline/grid-self-baseline-changes-grid-area-size-011.html https://github.com/web-platform-tests/wpt/blob/master/css/css-grid/alignment/self-baseline/grid-self-baseline-changes-grid-area-size-012.html

This is the relevant bits from the CSS Grid Layout spec that I consider apply to this bug: https://drafts.csswg.org/css-grid/#algo-baseline-shims