Rule Definition
An attacker can use a form to do spam emailing. Ensure the form markup does not contain id attribute.
Violation Code Sample
<form id="test">...</form><button form="test">X</button>
<form>...<input type="submit" value="Submit"></form>
Reference
https://html5sec.org/#1
http://www.whatwg.org/specs/web-apps/current-work/multipage/association-of-controls-and-forms.html#attr-fs-formaction
Related Technologies
HTML5
Technical Criterion
CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
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