[Webkit-unassigned] [Bug 199451] New: scrollLeft can become positive in vertical-rl writing-mode when -webkit-scrollbar is used

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=199451

            Bug ID: 199451
           Summary: scrollLeft can become positive in vertical-rl
                    writing-mode when -webkit-scrollbar is used
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Scrolling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fred.wang at free.fr
                CC: cathiechen at igalia.com, simon.fraser at apple.com
            Blocks: 161611

Created attachment 373393

  --> https://bugs.webkit.org/attachment.cgi?id=373393&action=review

testcase

See the attached testcase.

The elements have writing-mode vertical-rl and so scrollLeft goes from 0 (right) to left -200 (left).

However, when using -webkit-scrollbar, it is possible to make scrollLeft take a positive value. 

Note that this issue does not seem to happen with other writing-mode / direction values or when -webkit-scrollbar is not set:
https://people.igalia.com/fwang/scrollLeft-scrollTop.html

For now Cathie added a workround to https://w3c-test.org/css/cssom-view/scrollIntoView-vertical-rl-writing-mode.html to make the test pass in WebKit (it seems -webkit-scrollbar is used when using WebKit's layout test runner)


Referenced Bugs:

https://bugs.webkit.org/show_bug.cgi?id=161611
[Bug 161611] Support ScrollIntoViewOptions for Element.scrollIntoView
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