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<!DOCTYPE HTML>
<meta charset="utf-8" />
<title>HTML partial updates: patching via innerHTML with ambiguous target</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>
<div id="placeholder">Old content in light DOM</div>
<script>
// The ID "container" appears both after the container on which innerHTML is
// set, and in created fragment. Which element should be updated depends on the
// details of how this is spec'd.
test(() => {
const container = document.getElementById("container");
const outerPlaceholder = document.getElementById("placeholder");
container.innerHTML = `<div id="placeholder">Old content in innerHTML</div><template patchfor="placeholder">New content</template>`;
const innerPlaceholder = container.firstChild;
assert_equals(innerPlaceholder.id, "placeholder");
// This is the surprising part, that the outer placeholder is updated even
// though it appears after the updated placeholder in the final tree order.
assert_equals(outerPlaceholder.textContent, "New content");
assert_equals(innerPlaceholder.textContent, "Old content in innerHTML");
}, "<template patchfor> in innerHTML patching inner element");
</script>
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