References to Principles, Guidelines, Success Criteria and Conformance Requirements should be read in line with the WCAG 2.0 Recommendation.
Success Criterion 1.3.1
If a “for” attribute on a label element is filled but does not point to the ID of a form control, normally this throws a warning. However it was being thrown on button elements when it shouldn’t be. It now does not warn on any element defined as a “Labellable element” in the HTML5 definition. This includes button and a number of other HTML5-specific elements.