I've got some testcases on bug 1737904 (which I've just duped here), that helps demonstrate/visualize this issue. 2D version: https://bugzilla.mozilla.org/attachment.cgi?id=9247877 3D version: https://bugzilla.mozilla.org/attachment.cgi?id=9247878 I think it's reasonable to expect those testcase to render the same (or nearly the same), but the 3D one is much more jaggy/stairsteppy on its edges, apparently due to this bug.
Bug 1339664 Comment 4 Edit History
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I've got some testcases on bug 1737904 (which I've just duped here), that helps demonstrate/visualize this issue. 2D version: https://bugzilla.mozilla.org/attachment.cgi?id=9247877 3D version: https://bugzilla.mozilla.org/attachment.cgi?id=9247878 I think it's reasonable to expect those two testcases to render the same as each other (or nearly the same); but in current Firefox (going back to bug 1323797's commits), the 3D testcase is much more jaggy/stairsteppy on its edges, apparently due to this bug.