Visiting http://acid2.acidtests.org/ directs the user to click a link in order to take the Acid2 test. The link directs the user to an anchor on the same page (#top), but nothing happens. Clicking the link in other browsers causes the page to display the famed smiley face.
Dupe of or related to bug 20038?
In this case there is no form submission (unlike Bug 20038). Will investigate.
The bisect-builds script reports:
Works: r35231 Fails: r35249
Running git-bisect shows that this regressed in r35244.
fixed in r35648