Last modified: 2014-09-18 23:02:12 UTC
These were blacklisted because there were apparently (WebKit) browsers that blocked submission for invalid values, but didn't make it clear the user why. Testing with http://jsfiddle.net/hLceeL4m/2/ , Firefox 30.0 and Chromium 35.0.1916.153 seem to work fine. Safari 7 seems to let you submit, which is not compliant, but also not a confusing UX the way the original problems were. Safari 8 is coming out soon with Yosemite, so that and Opera should be tested.