Mapping To Rule
An implementation procedure does not need to be a one-to-one mapping to an ACT rule. A single implementation procedure can test multiple ACT rules. In manual test procedures, it is common to test multiple things at once. For instance, a procedure looking at the language of a page will simultaneously test whether or not the <html> element has a lang attribute, if the value of the lang attribute is valid, and if the value matches the language of the page. These are 3 separate rules, covered in a single test procedure of an implementation.
An accessibility tool or methodology can also have multiple implementation procedures that when combined, map to a single ACT rule. It is common in automated test tools to split up certain rules to build up more appropriate remediation advice. For example there can be a single ACT rule to test that all elements with the img role have an accessible name. An automated tool may implement testing img elements separate from role="img", so that remediation advice for elements that can have an alt attribute will differ from elements that can’t.
