File: template-patchfor-innerHTML-within.html

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<!DOCTYPE HTML>
<meta charset="utf-8" />
<title>HTML partial updates: patching via innerHTML</title>
<link rel=help href="https://github.com/WICG/declarative-partial-updates">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="container"></div>
<script>
test(() => {
    const container = document.getElementById("container");
    container.innerHTML = `<div id="placeholder">Old content in innerHTML</div><template patchfor="placeholder">New content</template>`;
    // <template patchfor> doesn't work within an innerHTML fragment, so the
    // placeholder should be intact and the <template> element remain in tree.
    const placeholder = container.querySelector("div");
    assert_equals(placeholder.id, "placeholder");
    assert_equals(placeholder.textContent, "Old content in innerHTML");
    assert_not_equals(container.querySelector("template"), null);
}, "<template patchfor> in innerHTML patching inner element");
</script>