[Webkit-unassigned] [Bug 171321] Add flag allow-modals to iframe sandbox

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=171321

--- Comment #3 from Rick Byers <rbyers at chromium.org> ---
It looks like there was some discussion here: https://groups.google.com/a/chromium.org/d/msg/blink-dev/wXbgxLu63Fo/YtsqkySmTWcJ

But yeah given that it's been in Chrome now for ages I'd say it's pretty clear that it's web compatible.  I found a couple reports of site breakage when Chrome made the change (eg. https://bugs.chromium.org/p/chromium/issues/detail?id=543485) but it sounds like those the user might actually want to preserve were fixed by adding allow-modals.

+mkwst who drove this effort in Chromium and can probably provide more data on the web compat risk.

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