[webkit-dev] Disallowing modal dialogs during unload events

Darin Fisher darin at chromium.org
Thu Apr 7 10:21:45 PDT 2011

As you know, I'm a very strong advocate of this change.  I think even if
ports aren't interested in experimenting with this change at the current
that we should proceed to experiment with it in Chromium.  I would very much
like us to have data about how many sites are impacted, so that we can share
that with others.


On Wed, Apr 6, 2011 at 4:37 PM, Sreeram Ramachandran <sreeram at google.com>wrote:

> We'd like to disallow modal dialogs (i.e., those arising from calls to
> alert, confirm, prompt or showModalDialog) during unload events
> (beforeunload, unload and pagehide) [1]. Chromium wants to do this
> [2]. Since this affects web compatibility, I'd like to get agreement
> from the other webkit ports as well.
> The benefits are:
> + Fewer annoyances for users who are trying to leave a page.
> + In the case of tab close, allows the browser to hide the tab before
> it has finished running the unload or pagehide event handlers (doesn't
> apply to beforeunload); gives the impression of better performance.
> This doesn't affect returning a non-null value from beforeunload; that
> will still cause the browser to show the stay-or-leave dialog. We
> think that is sufficient to satisfy legitimate needs to warn the user
> about data loss, etc.
> Outside webkit, this has been discussed on whatwg, but without a
> definite conclusion [3]. Firefox seems to be considering this as well
> [4].
> All in favour, say aye!
> [1] https://bugs.webkit.org/show_bug.cgi?id=56397
> [2] http://code.google.com/p/chromium/issues/detail?id=68780
> [3]
> http://lists.whatwg.org/pipermail/whatwg-whatwg.org/2010-February/025080.html
> [4] https://bugzilla.mozilla.org/show_bug.cgi?id=391834
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