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There's a good chance that someone having fun with canvas does not run a system which supports any version of IE... which might explain the lack of testing.

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A missing doctype shouldn't have anything to do with the system, though, assuming that's what the problem is. Clearly other browsers are more forgiving.

I didn't mean it from the code standard perspective. In a live product, invalid html is bad regardless of a system and it should be tested in all browsers.

But for one-off interesting thing, you'll probably check it in browser(s) you have installed only, or maybe even only your favourite one... and it's unlikely that IE will be that browser. Just a reflection on the setup of an average webdev interested in canvas.

Not having a doctype does indeed cause IE to go into quirks mode. This is still true even in IE9. Thankfully, <!DOCTYPE html> is recognized correctly, even by IE6.

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