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Test Info:

<!DOCTYPE html>
<meta charset="utf-8" >
<meta name="author" title="Di Zhang" href="mailto:dizhangg@chromium.org">
<meta name="assert" content="Basic slot fallback content, when dynamically created">
<title>Shadow DOM: Slots and fallback contents</title>
<link rel="match" href="slot-fallback-content-007-ref.html">
<div id="host">FAIL
<slot id="slot1" name="slot1">FAIL</slot>
<slot id="slot2" name="slot2">SLOT2</slot>
<slot id="slot3" name="slot3"></slot>
<slot id="slot4" name="slot4"></slot>
<div id="A">FAIL</div>
<div id="B" slot="slot1">B</div>
<div id="C" slot="slot3">C</div>
<div id="D" slot="slot-DNE">FAIL</div>
<div id="E" slot="slot1">E</div>
<div id="F">FAIL</div>
</div>
<script>
const shadowRoot = host.attachShadow({ mode: "open" });
shadowRoot.appendChild(slot1);
shadowRoot.appendChild(slot2);
shadowRoot.appendChild(slot3);
shadowRoot.appendChild(slot4);
</script>