Google Chrome input type="date"
Actually chrome's support for 'date' is broken. (See here). At least for the moment.
The use of 'date' in the HTML is absolutely fine - browser's which do not know of or support an input type are supposed to fallback to type='text'.
Currently chrome partially supports date, in a way that is essentially broken (it adds a couple of up-down buttons, but no datepicker.)
Of course you do need to bear in mind that if you are using type='date', and if the browser supports it, then you'll want to disable whatever datepicker support you'd otherwise be using.
UPDATE (6 Feb 2012):
It looks to me like this is now fixed. Chrome no longer claims to support input type='date', and does not provide the partially complete implementation.
UPDATE (17 Aug 2012):
Chrome does now have input type="date" support, and it's more functional this time.
Chrome does not have issues with date-inputs, you are using the wrong date-format, sir. Chrome isn't the only browser until today which has support for the new HTML5 inputs. Opera for example displays a dropdown with a calendar on inputs with type="date"
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Also the size-attribute does not exist on HTML5-date-inputs.