This should draw an outline but doesn't: <a href="http://www.apple.com" style="outline:10px auto purple"><h3>Hello</h3></a>
Created attachment 11034 [details] Test case Here is the above html attached as a test case.
<rdar://problem/4778099>
The reason the outline doesn't paint is that there is no line box for the <a>. I think there may also be an issue with outline painting when the dirty rect while painting doesn't intersect the first <a>. (This could come up more often with printing when the continuation splits across page breaks).
Created attachment 14456 [details] Improve continuation outline painting a lot.
Comment on attachment 14456 [details] Improve continuation outline painting a lot. r=me!
Fixed in r21363.