desc-img-alt-describedby-presentational-dynamic.html

<!doctype HTML>
<img src="foo.jpg" id="test" alt="test" aria-describedby="t1">
<span id="t1" role="presentation">foo</span>
<script>
setTimeout(() => {
    let span = document.createElement("span");
    span.id = "t1";
    span.role = "presentation";
    span.innerText = "foo";
    document.body.appendChild(span);
}, 0);
</script>

chromium/content/test/data/accessibility/accname/desc-img-alt-describedby-presentational-dynamic.html