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Test Info:

<!DOCTYPE html>
<!-- Any copyright is dedicated to the Public Domain.
<html class="reftest-wait">
<script>
function runTest() {
// Insert <p> after <summary>.
var paragraph = document.createElement("p");
var details_text = document.createTextNode("This is the details.");
paragraph.appendChild(details_text);
var details = document.getElementById("details");
details.appendChild(paragraph);
document.documentElement.removeAttribute("class");
}
</script>
<body onload="runTest();">
<details open id="details">
<summary>Summary</summary>
</details>
</body>
</html>