[Webkit-unassigned] [Bug 91766] didFirstVisuallyNonEmptyLayout() callback not fired for initial about:blank page in new loading window

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=91766





--- Comment #7 from Adam Barth <abarth at webkit.org>  2012-07-19 13:28:35 PST ---
> > Why do you care whether an about:blank page is modified?
> 
> That's the point at which it is no longer safe to show the pending URL in a newly created tab.  If you create a new tab with a slowly loading URL, we'd like to be able to display the URL in the address bar (http://crbug.com/9682).  However, a URL spoof exploit becomes possible if another window modifies the about:blank page before the slow page commits.

How is that different from
1) loading page A into a window X
2) Letting that load fully complete
3) Navigating X to page B (which is very slow)
4) Changing the contents of page A

In both cases, you'll be showing the pending URL for B and the content from A.

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