[Webkit-unassigned] [Bug 222398] New: Activating Reader View permanently sets window.PublicKeyCredential to undefined

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=222398

            Bug ID: 222398
           Summary: Activating Reader View permanently sets
                    window.PublicKeyCredential to undefined
           Product: WebKit
           Version: Safari 14
          Hardware: Mac (Intel)
                OS: macOS 11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: matthew at millerti.me

Created attachment 421492

  --> https://bugs.webkit.org/attachment.cgi?id=421492&action=review

Video demonstrating the issue

I accidentally discovered today in Safari 14.0.3 that activating Reader View sets that tab's `window.PublicKeyCredential` to `undefined`. This permanently disables API's like WebAuthn in that tab, and the undefined value persists across page reloads. The webpage must be reloaded in a new tab to restore functionality.

I've attached a video demonstrating the issue, as well as a screenshot showing `window.PublicKeyCredential` returning `undefined` after having toggled Reader View with the keyboard shortcut Cmd + Shift + R.

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