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Test Info:

<!DOCTYPE html>
<title>Shadow DOM: Slots and fallback contents in Document tree</title>
<meta name="author" title="Takayoshi Kochi" href="mailto:kochi@google.com">
<script src='/resources/testharness.js'></script>
<script src='/resources/testharnessreport.js'></script>
<script src="resources/shadow-dom.js"></script>
<div id="test1">
<div id="host">
<template data-mode="open">
<slot id="innerSlot"></slot>
</template>
<slot id="slot"><div id="fallback">This is fallback content</div></slot>
</div>
</div>
<script>
'use strict';
let n1 = createTestTree(test1);
removeWhiteSpaceOnlyTextNodes(n1.test1);
test(() => {
assert_array_equals(n1.innerSlot.assignedNodes(), [n1.slot]);
assert_array_equals(n1.innerSlot.assignedNodes({ flatten: true }), [n1.slot]);
}, 'Children of a slot in a document tree should not be counted in flattened ' +
'assigned nodes.');
</script>
<div id="test2">
<div id="host">
<template data-mode="open">
<div id="innerHost">
<template data-mode="open">
<slot id="innerSlot"></slot>
</template>
<slot id="slot"><div id="fallback">This is fallback content</div></slot>
</div>
</template>
</div>
</div>
<script>
'use strict';
let n2 = createTestTree(test2);
removeWhiteSpaceOnlyTextNodes(n2.test2);
test(() => {
assert_array_equals(n2.innerSlot.assignedNodes(), [n2.slot]);
assert_array_equals(n2.innerSlot.assignedNodes({ flatten: true }),
[n2.fallback]);
}, 'Slot fallback content in shadow tree should be counted in flattened ' +
'assigned nodes.');
</script>