[Webkit-unassigned] [Bug 243164] New: Scrolling through large tables leads to checkerboarding

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=243164

            Bug ID: 243164
           Summary: Scrolling through large tables leads to
                    checkerboarding
           Product: WebKit
           Version: Safari 13
          Hardware: Mac (Intel)
                OS: macOS 10.15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Scrolling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mdutta at mathworks.com
                CC: simon.fraser at apple.com

Created attachment 461193

  --> https://bugs.webkit.org/attachment.cgi?id=461193&action=review

This ZIP contains a sample HTML page which statically renders a large table with <table> and <div> elements

While scrolling through a virtualized tables, we notice a flash of white where the contents of the table disappear when we scroll fast using the scroll bar.
To check this issue, we try scrolling through a statically rendered table of large size of rows and columns,

We notice content disappearing while we are scrolling fast using the scroll bar and pointing device.

To reproduce the issue :
1. Unzip the contents of the attached `testfile.zip`
2. Run `npm install` and then `npm start` to start a local server
3. Access the http://localhost:8080 and scroll the table and div once the page loads. (Due to the large size, it might take some time)

We face this same problem with a virtualized implementation of the Table where the cells are loaded on demand when they are scrolled in the view port.

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