This article has more up-to-date documentation on what attributes and attribute values have been and have not been implemented, and in some cases, some background on that: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/Input#Browser_compatibility This site seems to be a bit behind on Firefox versions but has test pages: http://www.wufoo.com/html5/ Are any of these attributes/types particularly important to your project?