There are many IDEs with HTML 5, it is important not to share the current web technologies with HTML5, because they are really very close to being the same. For example, the latest version of the Adobe tool offers support for HTML5, as well as other IDEs such as Aptana. Unfortunately, the HTML5 specification has not yet been completed, so there may be discrepancies between browsers that the builder can work around, but will put a lot of burden on you.
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