Mozilla has launched a scathing attack on Microsoft, criticising the latest Internet Explorer release for not being modern enough, and highlighting a number of ways in which it is failing.

Paul Rouget, technology evangelist at Mozilla, commended IE9 for being better than IE8, but said it still does not stand up against the competition.

"IE9 is a step in the right direction, but I don't believe it to be a truly modern browser," he wrote in a blog post.

Rouget cited several reasons why IE9 is failing, starting with its lack of support for modern web standards, including HTML5.

Microsoft's claims about IE9's support features are flawed, according to Rouget, because they are drawn from internal Microsoft tests. Worse still, they were created during the development of the browser.

"Does IE9 support 99 per cent of the HTML5 specification as insinuated by Microsoft? No, they're actually pretty far from it," he said.

"The tests Microsoft are referring to are the ones they created during the development of IE9. It's not that surprising that they pass the very tests they used to design and develop the browser."

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