[Webkit-unassigned] [Bug 90546] New: Scrollbar width is not applied when element hidden

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=90546

           Summary: Scrollbar width is not applied when element hidden
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: New Bugs
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: allan.jardine at sprymedia.co.uk


I have a function which attempts to calculate the width of a scrollbar by putting two elements on to the page, one inside the other and forcing the inner element to a larger height than the outer which is overflow: auto; Then by subtracting the outer width from the inner we get the scrollbar width.

This works in nearly all applications, apparent from when -webkit-scrollbar styles are applied to the scrolling element, and the element is visibility: hidden (note that if the element is visible, then it works as expected).

Test case with element visible - works as expected: http://sprymedia.co.uk/media/misc/webkit/custom_scroll_visible.html
Test case with element hidden - doesn't work: http://sprymedia.co.uk/media/misc/webkit/custom_scroll_hidden.html

If -webkit-scrollbar styles are not applied, then it will work regardless of visibility.

Tested in WebKit r121825 and shipping Safari 5.1.7 (7534.57.2).

Filed in 'New Bugs' as I'm not sure if this is a Javascript or rendering engine issue.

-- 
Configure bugmail: https://bugs.webkit.org/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are the assignee for the bug.