[Webkit-unassigned] [Bug 223042] New: REGRESSION: unstyled progress elements don't render when view is not frontmost window

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=223042

            Bug ID: 223042
           Summary: REGRESSION: unstyled progress elements don't render
                    when view is not frontmost window
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: macOS 11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: chrisgrande at mac.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 422864

  --> https://bugs.webkit.org/attachment.cgi?id=422864&action=review

Nova Progress Bar demo

An unstyled progress element, both determinate and indeterminate, for example:

    <progress value="30" max="100"></progress>

When the window displaying the unstyled progress element is no longer active the progress bar vanishes completely. 

If the progress bar is styled for example:

    progress[value] {
      -webkit-appearance: none;
       appearance: none;

      width: 250px;
      height: 20px;
    } 

The styled progress bar will continue to be correctly rendered when the window is no longer active.

---

This is a regression from <10.15 where the progress bar would correctly render and in the correct unfocused aqua state.

This occurs in Safari/Safari Tech Preview, and WebViews embedded within applications. 

Attached is a screen recording of Nova, where the window is moved in and out of focus with a both styled and unstyled progress element.

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