[Webkit-unassigned] [Bug 218361] New: JS Promises in detached iframes do not settle

Thu Oct 29 15:52:29 PDT 2020

https://bugs.webkit.org/show_bug.cgi?id=218361

            Bug ID: 218361
           Summary: JS Promises in detached iframes do not settle
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: cdumez at apple.com

JS Promises in detached iframes do not settle:

===
<!doctype html>
<title>Test that the promise from detached iframes do get resolved.</title>
<body></body>
<script>
frame = document.createElement('iframe');
document.body.appendChild(frame);
frame.contentWindow.Promise.resolve("test").then(() => {
    alert("Resolved! URL is: " + document.URL);
});
frame.remove();
</script>
===

I see an alert in Chrome and Firefox (with the URL being the top document URL). No alert in Safari.

This is causing issues with our DOM API returning promises as well.

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