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Test Info: Warnings

<!DOCTYPE HTML>
<meta charset="utf-8" />
<title>HTML partial updates - declarative replace-children</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="placeholder" contentname="placeholder">Old content</div>
<template contentmethod="replace-children"><div id="placeholder" contentname="placeholder"><p id="stuff">New content</p></div></template>
<script>
test(() => {
const {firstChild} = document.getElementById("placeholder");
assert_equals(firstChild.id, "stuff")
assert_equals(firstChild.textContent, "New content");
}, "<template contentmethod=replace-children> with element");
</script>