Bug 258548

If the equivalent HTML attribute is present, ARIA attribute should be ignored as defined in the standard(see https://www.w3.org/TR/wai-aria-1.2/#usage and https://www.w3.org/TR/core-aam-1.2/#mapping_conflicts: "When a host language declares a WAI-ARIA attribute to be in direct semantic conflict with a native attribute for a given element, user agents MUST ignore the WAI-ARIA attribute and instead use the host language attribute with the same implicit semantic.")

Spec https://www.w3.org/TR/html-aam-1.0/#att-required, 'If the element includes both the required attribute and the aria-required attribute with a valid value, User Agents MUST expose only the required attribute value.'

Example code:
<input type="text" required aria-required="false">

How to check the value:
Inspector -> Elements -> Node -> Accessibility -> Required

Expected:
Required is Yes

Actual:
Required is No