There are two problems here. One is a Firefox bug, and one is a test bug. (1) [Firefox bug] All elements here are expected to show 2 scrollbars, but some of them are only showing one scrollbar. This is due to bug 1042151. (2) [Test bug] The test is assuming the scrollbars are always on the same side of the element. But in Firefox, we place the scrollbars on the writing-mode-specific "end" side of the element, I think. Here's are some testcases showing that, with a scrollbar on the left side in Firefox: ``` data:text/html,<div style="background:yellow;direction:rtl;overflow:scroll;width:100px;height:100px"><div style="width:999px;height:9999px"> data:text/html,<div style="background:yellow;writing-mode:vertical-rl;overflow:scroll;width:100px;height:100px"><div style="width:999px;height:9999px"> ``` (It looks like Safari agrees with Firefox on this, too, which is presumably why Safari "fails" this test as noted in comment 0 here.) tonikitoo, would you mind filing a github issue or doing whatever's needed to get (2) addressed?
Bug 1625674 Comment 4 Edit History
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There are two problems here. One is a Firefox bug, and one is a test bug. (1) [Firefox bug] All elements here are expected to show 2 scrollbars, but some of them are only showing one scrollbar. This is due to bug 1042151. (2) [Test bug] The test is assuming the scrollbars are always on the same side of the element. But in Firefox, we place the scrollbars on the writing-mode-specific "end" side of the element, I think. Here's are some testcases showing that, with a scrollbar on the left side in Firefox: ``` data:text/html,<div style="background:yellow;direction:rtl;overflow:scroll;width:100px;height:100px"><div style="width:999px;height:9999px"> data:text/html,<div style="background:yellow;writing-mode:vertical-rl;overflow:scroll;width:100px;height:100px"><div style="width:999px;height:9999px"> ``` ~(It looks like Safari agrees with Firefox on this, too, which is presumably why Safari "fails" this test as noted in comment 0 here.)~ [EDIT: This was apparently sort of wrong. I tested the last few versions of Safari, in April 2021 -- 14, 13.1, 12.1, 11.1 -- and they don't agree with Firefox **on the second testcase here**.] tonikitoo, would you mind filing a github issue or doing whatever's needed to get (2) addressed?