[Webkit-unassigned] [Bug 281786] New: Auto-scrolling on popular Guitar Tab site doesn't work when page is zoomed

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=281786

            Bug ID: 281786
           Summary: Auto-scrolling on popular Guitar Tab site doesn't work
                    when page is zoomed
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jalkut at red-sweater.com

The Ultimate Guitar tab site features an autoscroll button which is intended to scroll the content of the page automatically so you can play along.

The scroll works fine in Safari UNLESS you've zoomed the page to any non-100% zoom level.

To reproduce:

1. Navigate to any Ultimate Guitar song page, for example: https://tabs.ultimate-guitar.com/tab/the-beths/expert-in-a-dying-field-chords-4271140
2. Ensure the page is zoomed to actual size by pressing Cmd-0
3. Click the "Autoscroll" button at the bottom of the page
4. While the page content is scrolling, press Cmd-+ to increase the zoom factor for the page.

Expected: the scrolling should continue

Actual: the scrolling stops

Notice that if you switch back to 100% (Cmd-0) the scrolling immediately begins again. Then zooming to a non-100% factor immediately stops it.

I don't know if this is ultimately (hah!) a bug in their autoscrolling code, or something wrong in WebKit. I confirmed though that the same feature works at all zoom sizes in Chrome.

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