[Webkit-unassigned] [Bug 217509] New: Element.requestFullscreen will unintended change document.activeElement

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=217509

            Bug ID: 217509
           Summary: Element.requestFullscreen will unintended change
                    document.activeElement
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Macintosh
                OS: macOS 10.15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: abc at hub.moe

Element.requestFullscreen() will unintended change document.activeElement on Safari 14+ if Document include an input element.

Reproduce:
1. Open https://semibold.github.io/Fullscreen/test/index.html on Safari 14+
2. Select Consoles tab in DevTools
3. Run `document.body.appendChild(document.createElement('input'))` to insert an input element
4. Run `console.log(document.activeElement)` (log: document.body)
5. Click [Request] button to requestFullscreen on current page
6. Run `console.log(document.activeElement)` (log: input. Expected: document.body)

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