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I then installed this module https://pypi.python.org/pypi/wtforms-html5 which allowed for it, and everything worked. But I was unhappy about adding an extra dependency, especially as it doesn't seem to be actively developed (https://github.com/brutus/wtforms-html5).
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I then ended up on the WTForms github page, and found that actually there is support for all the new HTML5 fields, but that these fields aren't imported by default. https://github.com/wtforms/wtforms/blob/master/wtforms/fields/html5.py Therefore instead of using