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Test Info:

<!doctype html>
<head>
<link rel="match" href="cross-shadow-boundary-slot-3-ref.html"/>
</head>
<span id="outer">Outer</span>
<div id="host">
<template shadowrootmode="open">
<span>Inner</span>
<div id="innerHost">
<template shadowrootmode="open">
<slot></slot>
<span>Nested</span>
</template>
<span id="slotted">Slotted</span>
</div>
</template>
</div>
<script>
// Selected texts are
// er
// Inner
// Slot Nested
const start = outer.firstChild;
const end = host.shadowRoot.getElementById("slotted").firstChild;
window.getSelection()
.setBaseAndExtent(start, 3, end, 4);
</script>