chromium/third_party/blink/web_tests/accessibility/aria-fallback-roles.html

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
<html>
<head>
<script src="../resources/js-test.js"></script>
</head>
<body id="body">

<span tabindex="0" id="test1" role="unknownrole checkbox" aria-checked="true">test1</span>
<!--known role with whitespace edge cases-->
<span tabindex="0" id="test2" role="	button" data-testname="ignoring tab">test2</span>
<span tabindex="0" id="test3" role="  button" data-testname="ignoring whitespace">test3</span>
<span tabindex="0" id="test4" role="
button" data-testname="ignoring line break">test4</span>

<p id="description"></p>
<div id="console"></div>

<script>
    description("This tests that aria fallback roles work correctly.");
    if (window.accessibilityController) {
        const snippets = [
            ['test1', 'AXRole: AXCheckBox'],
            ['test2', 'AXRole: AXButton'],
            ['test3', 'AXRole: AXButton'],
            ['test4', 'AXRole: AXButton'],
        ];

        for (var [id, expectedRole] of snippets) {
            var test = document.getElementById(id);
            test.focus();
            test = accessibilityController.focusedElement;

            shouldBe("test.role", "expectedRole");
            debug("Role should be: " + test.role);
        }
    }
</script>

</body>
</html>