With both attached reduced testcases: EXPECTED RESULTS: Red border should encompass the yellow children. ACTUAL RESULTS: Red border doesn't stretch far enough to the right -- it looks like it's only as wide as the first child plus the subsequent children's content-box-width. (It does not account for their padding.) This is not a recent regression -- here's the regression range: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=1dc6b294800d&tochange=c45f6e6d6005 That includes our changeset that enabled support for text-decoration-break in Nightlies, in bug 1006326. (It landed in Firefox 33 and was uplifted to 32). ni=mats who worked on that
Bug 1552357 Comment 3 Edit History
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With both attached reduced testcases: EXPECTED RESULTS: Red border should encompass the yellow children. ACTUAL RESULTS: Red border doesn't stretch far enough to the right -- it looks like it's only as wide as the first child plus the subsequent children's content-box-width. (It does not account for their padding.) This is not a recent regression -- here's the regression range: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=1dc6b294800d&tochange=c45f6e6d6005 That includes our changeset that enabled support for box-decoration-break in Nightlies, in bug 1006326. (It landed in Firefox 33 and was uplifted to 32). ni=mats who worked on that