Disable client-side validation in MVC 3 "cancel" submit button

What is this mystical force that causes the answer to reveal itself as soon as you post a question somewhere?

It looks like in MVC 3 you disable client-side validation on a button by adding the class "cancel" to it. So in my example:

<input type="submit" name="backButton" value="← Back"
 title="Go back to step 1." class="cancel" />

works great. And no ID attribute is needed either. If you have an actual style class on the button, just do this:

<input type="submit" name="backButton" value="← Back"
 title="Go back to step 1." class="style-name cancel" />

I know... very old question.. Yet it was the top of the search results when I looked.

For MVC 4 (and a BUTTON) it seems (at least for me) that the answer is simply adding the formnovalidate="formnovalidate"

 <button type="submit" class="btn btn-outline-success border-0" formnovalidate="formnovalidate" name="command" value="Back" title="Back">
    <span class="fas fa-arrow-left" aria-hidden="true"></span>
    &nbsp;Back
</button>

The validation scripts seem to be linked to the submit type input. By changing cancel to a button, validation is skipped:

<button type="button" onclick="document.location.href('Index')">Cancel</button>