Fix range: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=df596657bebcb96b917d75ff452316bbe8140a1a&tochange=5bfe22b4bd0d64b9d105b66b3ed0fcee10d70e93 In that range, bug 1610981 probably would've been the thing to fix this, since it dealt with animations and pseudo elements. Not sure if there's still a bug lurking elsewhere in the neighborhood of `em` resolution independent of pseudo-elements etc., but we can reopen or file a new bug if we get such a testcase.
Bug 1168977 Comment 5 Edit History
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Fix range: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=df596657bebcb96b917d75ff452316bbe8140a1a&tochange=5bfe22b4bd0d64b9d105b66b3ed0fcee10d70e93 In that range, bug 1610981 probably would've been the thing to fix this, since it dealt with animations relating to pseudo elements (both of which are used by the testcase here). Not sure if there's still a bug lurking elsewhere in the neighborhood of `em` resolution independent of pseudo-elements etc., but we can reopen or file a new bug if we get such a testcase.
Fix range: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=df596657bebcb96b917d75ff452316bbe8140a1a&tochange=5bfe22b4bd0d64b9d105b66b3ed0fcee10d70e93 In that range, bug 1610981 probably would've been the thing to fix this, since it dealt with animations relating to pseudo elements (both of which are used by the testcase here). Not sure if there's still a bug lurking elsewhere here, regarding `em` resolution, which is independent of pseudo-elements etc; but we can reopen or file a new bug if we get such a testcase.