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Current Css3 Html5 Support

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Adrian Roselli

Member info

User since: 14 Dec 1998

Articles written: 85

The Tool

Last week saw the launch of, a very handy web site that displays a user's current IP address (along with a geographic breakdown to city, if possible), user agent string (browser, version and operating system) and support for CSS3 and HTML5 (read the article about it). It accomplishes this last bit by using the Modernizr JavaScript library to test a series of features in your browser:

  • @font-face
  • Canvas
  • Canvas Text
  • HTML5 Audio
  • HTML5 Video
  • rgba()
  • hsla()
  • border-image
  • border-radius
  • box-shadow
  • Multiple backgrounds
  • opacity
  • CSS Animations
  • CSS Columns
  • CSS Gradients
  • CSS Reflections
  • CSS 2D Transforms
  • CSS 3D Transforms
  • CSS Transitions
  • Geolocation API

If you are running the Google Chrome for Internet Explorer plug-in, it will show up in your browser user agent string on this page. However, it will also report your Internet Explorer browser as Chrome.

The Results

The site developers ran their own browsers through this tool and that collection of information has been gathered up and posted to provide information on current browser support for the latest standards (or recommendations). Deep Blue Sky, one of the developers of this site, has written up the level of support in all the A-Grade browsers. Yahoo's model outlines A-Grade browsers as "... identified, capable, modern and common" and claims "approximately 96% of our audience enjoys an A-grade experience." This is their codified way of simply saying, "the latest common browsers." If you read my post, Browser Performance Chart, then you'll see the same browsers. The article, Browser support for CSS3 and HTML5, covers the following browsers (the author didn't test against anything other than Windows versions):

  • Safari 4 (Win)
  • Firefox 3.5 (Win)
  • Google Chrome (Win)
  • Opera 10 (Win)
  • Internet Explorer 6, 7 & 8

The surprise in here is that Safari 4 outshone (outshined? outshinerified?) the others with Google Chrome coming up close behind. Firefox 3.5 was missing some key CSS3 support and Opera 10 was surprisingly lacking in support. As expected, Internet Explorer brings up the rear, lacking in everything but @font-face support (even in IE8) which has actually been there since version 6 (but only for the .eot format).

A founder of, Adrian Roselli (aardvark) is the Senior Usability Engineer at Algonquin Studios, located in Buffalo, New York.

Adrian has years of experience in graphic design, web design and multimedia design, as well as extensive experience in internet commerce and interface design and usability. He has been developing for the World Wide Web since its inception, and working the design field since 1993. Adrian is a founding member, board member, and writer to In addition, Adrian sits on the Digital Media Advisory Committee for a local SUNY college and a local private college, as well as the board for a local charter school.

You can see his brand-spanking-new blog at as well as his new web site to promote his writing and speaking at

Adrian authored the usability case study for in Usability: The Site Speaks for Itself, published by glasshaus. He has written three chapters for the book Professional Web Graphics for Non Designers, also published by glasshaus. Adrian also managed to get a couple chapters written (and published) for The Web Professional's Handbook before glasshaus went under. They were really quite good. You should have bought more of the books.

The access keys for this page are: ALT (Control on a Mac) plus: is an all-volunteer resource for web developers made up of a discussion list, a browser archive, and member-submitted articles. This article is the property of its author, please do not redistribute or use elsewhere without checking with the author.