"IE9 is definitely better than IE8 and a step in the right direction, but I don't believe it to be a truly modern browser...IE9: More modern, but not really modern," he added.
Rouget wrote: "Microsoft is bragging a lot about HTML5. They are also suggesting that their HTML5 support is exceptionally good compared to other vendors," and then set about detailing why, with complex graphics and references to standards tests including caniuse.com and html5tests.com to back up his claim.
Microsoft's response to the attack is that "IE's approach to HTML5 is meant to suit real-world practicies":
Asked to comment on Rouget's claims, Microsoft said that IE's approach to HTML5 is meant to suit real-world practices. "We spent much time researching and looking at what developers are building today and what they want to build tomorrow to define what we build in Internet Explorer 9 today," reads a statement from the company.
"We used that research to inform our view of HTML5 and the pieces that matter most to designers and developers in building these next set of experiences on the Web. In terms of HTML5 defined, it remains a combination of what developers will want to do and the definitions set forth by the W3C as the ultimate authority in defining standards for the Web."