adding html5 field attributes to a model form

I'm trying to edit the field type in a form that is using the html5 doctype. I've tried two ways:

class AddressForm(ModelForm):

    contact_email = forms.TextInput(attrs={'type': 'email'})

and 

class AddressForm(ModelForm):

    def __init__(self, *args, **kwargs):

            super(AddressForm, self).__init__(*args, **kwargs)

            self.fields['contact_email'].widget.attrs["type"] = 'email'

Neither works. 

Am I looking in the wrong place?

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