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Test Info:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Default properties on &lt;semantics&gt; and &lt;maction&gt;</title>
<meta name="assert" content="Test that only the first children of semantics/maction are displayed.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<div id="log"></div>
<div>
<math>
<semantics>
<mn>1</mn>
<mn>2</mn>
<mn>3</mn>
<mn>4</mn>
<mn>5</mn>
</semantics>
<maction>
<mn>1</mn>
<mn>2</mn>
<mn>3</mn>
<mn>4</mn>
<mn>5</mn>
</maction>
</math>
</div>
<script>
["semantics", "maction"].forEach(name => {
let element = document.getElementsByTagName(name)[0];
test(() => {
let child = element.firstElementChild;
assert_not_equals(window.getComputedStyle(child).display, "none", `Child ${child.innerText} does not have display: none`);
for (child = child.nextElementSibling; child; child = child.nextElementSibling) {
assert_equals(window.getComputedStyle(child).display, "none", `Child ${child.innerText} has display: none`);
}
}, `Display value of children of the <${name}> element`);
});
</script>
</body>
</html>