LayoutTests/accessibility/custom-elements/current.html

<!DOCTYPE html>
<html>
<body>
<script src="../../resources/js-test.js"></script>
<script src="../../resources/accessibility-helper.js"></script>
<custom-element id="custom-location"></custom-element>
<custom-element id="custom-page" aria-current="page"></custom-element>
<script>

customElements.define('custom-element', class CustomElement extends HTMLElement {
    constructor()
    {
        super();
        const internals = this.attachInternals();
        internals.ariaCurrent = 'location';
    }
});

description("This tests that aria fallback roles work correctly.");
if (!window.accessibilityController)
    debug('This test requires accessibilityController');
else {
    shouldBeEqualToString('accessibilityController.accessibleElementById("custom-location").currentStateValue', 'location');
    shouldBeEqualToString('accessibilityController.accessibleElementById("custom-page").currentStateValue', 'page');
}

</script>
</body>
</html>