Add role attribute

Why do you need to add “form” role to <form> element? Isn’t it redundant?

No, it may seem so but is not. The role defines a WAI-ARIA landmark to screen readers for quicker jumps around a page. Note the attribute can also take on the “search” landmark to distinguish it from a generic form, and does not necessarily need to be within the <form> tag but could also be put in the surrounding <div> tag. All Contact Form 7 forms should have role=”form” built-in to be WAI-ARIA compliant, and you might also consider building in support for the aria-label or aria-labelledby attributes for situations where there are multiple forms on a single page since screen readers will announce this to distinguish them.

See https://www.w3.org/WAI/GL/wiki/Using_ARIA_landmarks_to_identify_regions_of_a_page for reference.