Insert fontawesome icon into form submission button

[Jon Subscripted]

Hi all,

I'm trying to insert a fontawesome icon into a form submission button.

<i class="fas fa-bookmark"></i>

The form is being created in the controller using FORM.

  form=FORM(INPUT(_name='bookmark',_id="bookmark",_type='hidden'),
              INPUT(_type='submit',_class='btn btn',_value=T('Bookmark')))

I've tried a couple of things so far (listed bellow), but none of them worked:

1. form=FORM(INPUT(_name='bookmark',_id="bookmark",_type='hidden'),         INPUT(_type='submit',_class='btn btn',_value='<i class="fas fa-bookmark"></i>'+T('Bookmark')))
2. form=FORM(INPUT(_name='bookmark',_id="bookmark",_type='hidden'),
                 INPUT(_type='submit',_class='btn btn',_value=XML('<i class="fas fa-bookmark"></i>')+T('Bookmark')))
   

Any suggestions on how could I do this?

Thanks, Jon.

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