forms - How to set HTML5 attributes like 'required' using a Slim template -

i m laying out form using slim template language , want add required attribute input.

input#first_name(required name="first_name" type="text" pattern="^[a-z][a-z]+$")

however html generated ends being

 <input id="first_name" name="first_name" pattern="^[a-z][a-z]+$" required="" type="text" />

and that's not need.

i've gone through docs can't see way slim add standalone html5 attribute.

likewise adding data-abide attribute form tag (as required zurb foundation framework) fails.

form.custom(data-abide method="post" action="/registration")

leads to

<form action="/registration" class="custom" data-abide="" method="post">

which zurb scripts ignore.

what missing?

in *.html.slim file do:

input#first_name required="" name="first_name" type="text" pattern="^[a-z][a-z]+$"

note empty attribute syntax:

<input required>

is equivalent to:

<input required="">

Error