mysticatea / webkit-test

Webkit's weird behavior

https://mysticatea.github.io/webkit-test/index.html

1. iframe.html has a button to change URL fragment.
2. index.html has <iframe> element for iframe.html.
3. index.html subscribes the hashchange event of iframe.html.
   • It updates the URL fragment of index.html.

Expected behavior

The URL fragments of index.html and iframe.html are changed.

Actual behavior

• Chromium 90.0.4421.0 : Fine
• Firefox 86.0b10 : Fine
• Safari 14.1 : Bad - The top-level browsing context navigated to iframe.html for some reason.

WebKit Bugzilla

• https://bugs.webkit.org/show_bug.cgi?id=223439