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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - I found one more onbeforeunload event return value coercion edge case"
href="https://bugs.webkit.org/show_bug.cgi?id=169789">169789</a>
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<th>Summary</th>
<td>I found one more onbeforeunload event return value coercion edge case
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<th>Classification</th>
<td>Unclassified
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<th>Product</th>
<td>WebKit
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<th>Version</th>
<td>Safari Technology Preview
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<th>Hardware</th>
<td>Unspecified
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<th>OS</th>
<td>Unspecified
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>Normal
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<th>Priority</th>
<td>P2
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<th>Component</th>
<td>HTML Events
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<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
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<th>Reporter</th>
<td>d@domenic.me
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<pre>The newly-introduced test at <a href="http://w3c-test.org/html/browsers/browsing-the-web/unloading-documents/beforeunload-canceling.html">http://w3c-test.org/html/browsers/browsing-the-web/unloading-documents/beforeunload-canceling.html</a> named
<span class="quote">> Returning false must not cancel the event, because it's coerced to the DOMString "false" which does not cancel CustomEvents: CustomEvent, cancelable</span >
does not pass in Safari Tech Preview 25. Everything else does (except the test "Returning a string must not cancel the event: BeforeUnloadEvent with type "click", cancelable" which is fine since it's best if Safari doesn't implement createEvent("beforeunload"); see <a href="https://github.com/whatwg/dom/issues/362">https://github.com/whatwg/dom/issues/362</a>.)</pre>
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