IETC: WebKit does not support ridiculous text-shadow spread values
Spread of 96px in the test. Seems pretty big. Not sure if we should support this.
It's also possible I'm misunderstanding the bug.
WebKit only supports spread in box-shadow, not in text-shadow.
CSS WG is currently discussing spread on text-shadow. It's unclear how it behaves. Thread starts at http://lists.w3.org/Archives/Public/www-style/2012Jan/0991.html
Note that spread is in the spec now and has been for some time: https://drafts.csswg.org/css-text-decor-4/#ref-for-propdef-text-shadow%E2%91%A1
I raised an issue about `spread` on `text-shadow` here: https://github.com/w3c/csswg-drafts/issues/6971