How does modernizr check support for the new input attributes in webforms2.0?

Well, that's pretty much my whole question. I can see how they check for CSS3-support, trying to fetch style.borderRadius and such to see if the browser knows what the heck is going on. But since most browsers will let the attribute stay (<input type="date">), but still not support it fully, I can't understand how 开发者_StackOverflowthey do their magic.

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For each input type it's different, mostly: http://github.com/Modernizr/Modernizr/blob/master//modernizr.js#L699-751

I think the inline comments describe the considerations for each, so... I'll direct you there. :)

But the first thing we do is do elem.value = ':)' and see if that sticks. If it does, then it's an indication the feature isn't in place.

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There is an issue with the detection of date, datetime, etc using this method in Chromium 15 and the above test fails. I have updated the code and submitted it here: https://github.com/buzypi/Modernizr/blob/patch-1/modernizr.js and created a pull request here: https://github.com/Modernizr/Modernizr/pull/439