Is HTML 5 supported by all the main browsers?

Question

I am looking at the custom attributes feature of html 5 here at this link http://ejohn.org/blog/html-5-data-attributes/

This look like the perfect thing for when

Answer 1

Almost no web technology is completely supported by any browser; no bugs, quirks or issues.

HTML5 is designed for backwards compatibility, and it will hardly break your site (take <input type=url> for instance - non-supporting browsers show an ordinary text box, Opera lets you select an URL from history/bookmarks). I'd go by the approach: develop, try in the browsers you need to support - if it works, awesome. If not, don't use it. Just like with other specs.

Answer 2

No.

The Wikipedia page "Comparison of layout engines (HTML 5)" does a good job of listing which engines have implemented which parts of HTML5.

There is currently a lot of red boxes on those tables, and that is based on the latest development version, not the version most users will be using.

Answer 3

Various portions of HTML5 are supported by the different browsers, for various definitions of 'supported'.

Several parts work right now, reliably. The data-* attributes you ask about in your question work just fine in every browser, even IE6; however, nobody yet supports the fun "dataset" method to access them. As long as you're fine with just grabbing them by the full attr name, you're golden. I use them to store state all the time in my webapps, as they're the officially blessed method for doing so.

Wikipedia has a good summary of the various support levels across browsers: http://en.wikipedia.org/wiki/Comparison_of_layout_engines_(HTML_5)

Answer 4

no, not yet. wait at least until gecko and webkit support it.

ps: you could use html 5 with data attributes anyway, if you need it for javascript purposes. or choose some other unused attributes (title, abbr, ...others?)

Answer 5

Full support of HTML 5 is a way off BUT...

Creating custom attributes is nothing new and is likely to work in all the main browsers - but test to be sure that it will work in your case.

We can use HTML 5 now, just not all of it. A lot of HTML 5 is about formalising the way that HTML is currently used and ensuring backwards compatibility - so if a feature works in browsers now, use it.

Answer 6

As of August 25, HTML 5 is still a working draft. http://dev.w3.org/html5/spec/Overview.html