[Webkit-unassigned] [Bug 189376] New: Ignore-opens-during-unload counter of a parent should apply to its children during beforeunload event

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=189376

            Bug ID: 189376
           Summary: Ignore-opens-during-unload counter of a parent should
                    apply to its children during beforeunload event
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: timothygu99 at gmail.com
                CC: cdumez at apple.com

Per https://html.spec.whatwg.org/multipage/browsing-the-web.html#prompt-to-unload-a-document, the ignore-opens-during-unload counter of the document on which "prompt to unload" is called should stay incremented even as its descendants are being prompted for unload. This is the behavior of Firefox as well as Chrome 70+.

Test is available at https://github.com/web-platform-tests/wpt/blob/master/html/webappapis/dynamic-markup-insertion/opening-the-input-stream/ignore-opens-during-unload.window.js. In particular, the "document.open should bail out when ignore-opens-during-unload is greater than 0 during beforeunload event (open(parent) while unloading parent and child)" test currently fails.

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