[Webkit-unassigned] [Bug 196497] New: When scrolling the Twitter timeline page, some tweet's block background color changes to black

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=196497

            Bug ID: 196497
           Summary: When scrolling the Twitter timeline page, some tweet's
                    block background color changes to black
           Product: WebKit
           Version: Safari 12
          Hardware: Macintosh
                OS: macOS 10.14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: blude at me.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 366497

  --> https://bugs.webkit.org/attachment.cgi?id=366497&action=review

Screen recording of the bug on the Twitter timeline

This issue affects specially the Twitter timeline page. Sometimes, when scrolling the page, a tweet block background color changes to black. Hovering the element may change it back to normal.

1) Open a Twitter timeline page. (Used my own timeline, https://twitter.com/@blude)

2) Scroll down the page. (Keep the mouse pointer away from the main timeline region)

The tweet content blocks have a `:hover` selector used to change its background color to light-gray.

Some rare blocks, anecdotally ones with rich media displayed, will have its background color changed or flashed to black when scrolling.

The tweet blocks should retain its normal background color.

Hovering the mouse pointer into the affected block will revert the background color to its correct style. 

This issued was not noticed in macOS Safari version prior to 12.1

The attached video file has a screen recording of the issue.

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