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<!DOCTYPE html>
<title>Shadow DOM: Slots and fallback contents</title>
<meta name="author" title="Hayato Ito" href="mailto:hayato@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="s1" name="slot1">
<div id="f1"></div>
</slot>
</template>
</div>
</div>
<script>
test(() => {
let n = createTestTree(test1);
removeWhiteSpaceOnlyTextNodes(n.test1);
assert_equals(n.f1.assignedSlot, null);
assert_array_equals(n.s1.assignedNodes(), []);
assert_array_equals(n.s1.assignedNodes({ flatten: true }), [n.f1]);
}, 'Slots fallback: Basic.');
test(() => {
let n = createTestTree(test1);
assert_array_equals(n.s1.assignedElements(), []);
assert_array_equals(n.s1.assignedElements({ flatten: true }), [n.f1]);
}, 'Slots fallback: Basic, elements only.');
</script>
<div id="test2">
<div id="host">
<template data-mode="open">
<slot id="s1" name="slot1">
<slot id="s2" name="slot2">
<div id="f1"></div>
</slot>
</slot>
</template>
</div>
</div>
<script>
test(() => {
let n = createTestTree(test2);
removeWhiteSpaceOnlyTextNodes(n.test2);
assert_equals(n.f1.assignedSlot, null);
assert_array_equals(n.s1.assignedNodes(), []);
assert_array_equals(n.s2.assignedNodes(), []);
assert_array_equals(n.s1.assignedNodes({ flatten: true }), [n.f1]);
assert_array_equals(n.s2.assignedNodes({ flatten: true }), [n.f1]);
}, 'Slots fallback: Slots in Slots.');
test(() => {
let n = createTestTree(test2);
assert_array_equals(n.s1.assignedElements(), []);
assert_array_equals(n.s2.assignedElements(), []);
assert_array_equals(n.s1.assignedElements({ flatten: true }), [n.f1]);
assert_array_equals(n.s2.assignedElements({ flatten: true }), [n.f1]);
}, 'Slots fallback: Slots in Slots, elements only.');
</script>
<div id="test3">
<div id="host">
<template data-mode="open">
<slot id="s1" name="slot1">
<slot id="s2" name="slot2">
<div id="f1"></div>
</slot>
</slot>
</template>
<div id="c1" slot="slot1"></div>
</div>
</div>
<script>
test(() => {
let n = createTestTree(test3);
removeWhiteSpaceOnlyTextNodes(n.test3);
assert_equals(n.c1.assignedSlot, n.s1);
assert_equals(n.f1.assignedSlot, null);
assert_array_equals(n.s1.assignedNodes(), [n.c1]);
assert_array_equals(n.s2.assignedNodes(), []);
assert_array_equals(n.s1.assignedNodes({ flatten: true }), [n.c1]);
assert_array_equals(n.s2.assignedNodes({ flatten: true }), [n.f1]);
}, 'Slots fallback: Fallback contents should not be used if a node is assigned.');
</script>
<div id="test4">
<div id="host">
<template data-mode="open">
<slot id="s1" name="slot1">
<slot id="s2" name="slot2">
<div id="f1"></div>
</slot>
</slot>
</template>
<div id="c1" slot="slot2"></div>
</div>
</div>
<script>
test(() => {
let n = createTestTree(test4);
removeWhiteSpaceOnlyTextNodes(n.test4);
assert_equals(n.c1.assignedSlot, n.s2);
assert_equals(n.f1.assignedSlot, null);
assert_array_equals(n.s1.assignedNodes(), []);
assert_array_equals(n.s2.assignedNodes(), [n.c1]);
assert_array_equals(n.s1.assignedNodes({ flatten: true }), [n.c1]);
assert_array_equals(n.s2.assignedNodes({ flatten: true }), [n.c1]);
}, 'Slots fallback: Slots in Slots: Assigned nodes should be used as fallback contents of another slot');
</script>
<div id="test5">
<div id="host1">
<template data-mode="open">
<div id="host2">
<template data-mode="open">
<slot id="s4" name="slot4">
<slot id="s3" name="slot3">
<div id="f3"></div>
</slot>
<div id="f4"></div>
</slot>
</template>
<slot id="s2" name="slot2" slot="slot3">
<slot id="s1" name="slot1">
<div id="f1"></div>
</slot>
<div id="f2"></div>
</slot>
</div>
</template>
<div id="c1" slot="slot1"></div>
</div>
</div>
<script>
test(() => {
let n = createTestTree(test5);
removeWhiteSpaceOnlyTextNodes(n.test5);
assert_array_equals(n.s1.assignedNodes(), [n.c1]);
assert_array_equals(n.s2.assignedNodes(), []);
assert_array_equals(n.s3.assignedNodes(), [n.s2]);
assert_array_equals(n.s4.assignedNodes(), []);
assert_array_equals(n.s1.assignedNodes({ flatten: true }), [n.c1]);
assert_array_equals(n.s2.assignedNodes({ flatten: true }), [n.c1, n.f2]);
assert_array_equals(n.s3.assignedNodes({ flatten: true }), [n.c1, n.f2]);
assert_array_equals(n.s4.assignedNodes({ flatten: true }), [n.c1, n.f2, n.f4]);
}, 'Slots fallback: Complex case.');
test(() => {
let n = createTestTree(test5);
assert_array_equals(n.s1.assignedElements(), [n.c1]);
assert_array_equals(n.s2.assignedElements(), []);
assert_array_equals(n.s3.assignedElements(), [n.s2]);
assert_array_equals(n.s4.assignedElements(), []);
assert_array_equals(n.s1.assignedElements({ flatten: true }), [n.c1]);
assert_array_equals(n.s2.assignedElements({ flatten: true }), [n.c1, n.f2]);
assert_array_equals(n.s3.assignedElements({ flatten: true }), [n.c1, n.f2]);
assert_array_equals(n.s4.assignedElements({ flatten: true }), [n.c1, n.f2, n.f4]);
}, 'Slots fallback: Complex case, elements only.');
test(() => {
let n = createTestTree(test5);
removeWhiteSpaceOnlyTextNodes(n.test5);
let d1 = document.createElement('div');
n.s2.appendChild(d1);
assert_array_equals(n.s1.assignedNodes({ flatten: true }), [n.c1]);
assert_array_equals(n.s2.assignedNodes({ flatten: true }), [n.c1, n.f2, d1]);
assert_array_equals(n.s3.assignedNodes({ flatten: true }), [n.c1, n.f2, d1]);
assert_array_equals(n.s4.assignedNodes({ flatten: true }), [n.c1, n.f2, d1, n.f4]);
}, 'Slots fallback: Mutation. Append fallback contents.');
test(() => {
let n = createTestTree(test5);
removeWhiteSpaceOnlyTextNodes(n.test5);
n.f2.remove();
assert_array_equals(n.s1.assignedNodes({ flatten: true }), [n.c1]);
assert_array_equals(n.s2.assignedNodes({ flatten: true }), [n.c1]);
assert_array_equals(n.s3.assignedNodes({ flatten: true }), [n.c1]);
assert_array_equals(n.s4.assignedNodes({ flatten: true }), [n.c1, n.f4]);
}, 'Slots fallback: Mutation. Remove fallback contents.');
test(() => {
let n = createTestTree(test5);
removeWhiteSpaceOnlyTextNodes(n.test5);
let d2 = document.createElement('div');
d2.setAttribute('slot', 'slot2');
n.host1.appendChild(d2);
assert_array_equals(n.s2.assignedNodes(), [d2]);
assert_array_equals(n.s2.assignedNodes({ flatten: true }), [d2]);
assert_array_equals(n.s3.assignedNodes({ flatten: true }), [d2]);
assert_array_equals(n.s4.assignedNodes({ flatten: true }), [d2, n.f4]);
}, 'Slots fallback: Mutation. Assign a node to a slot so that fallback contens are no longer used.');
test(() => {
let n = createTestTree(test5);
removeWhiteSpaceOnlyTextNodes(n.test5);
n.c1.remove();
assert_array_equals(n.s1.assignedNodes(), []);
assert_array_equals(n.s1.assignedNodes({ flatten: true }), [n.f1]);
assert_array_equals(n.s2.assignedNodes({ flatten: true }), [n.f1, n.f2]);
assert_array_equals(n.s3.assignedNodes({ flatten: true }), [n.f1, n.f2]);
assert_array_equals(n.s4.assignedNodes({ flatten: true }), [n.f1, n.f2, n.f4]);
}, 'Slots fallback: Mutation. Remove an assigned node from a slot so that fallback contens will be used.');
test(() => {
let n = createTestTree(test5);
removeWhiteSpaceOnlyTextNodes(n.test5);
n.s1.remove();
assert_array_equals(n.s1.assignedNodes(), []);
assert_array_equals(n.s1.assignedNodes({ flatten: true }), [],
'fall back contents should be empty because s1 is not in a shadow tree.');
assert_array_equals(n.s2.assignedNodes({ flatten: true }), [n.f2]);
assert_array_equals(n.s3.assignedNodes({ flatten: true }), [n.f2]);
assert_array_equals(n.s4.assignedNodes({ flatten: true }), [n.f2, n.f4]);
}, 'Slots fallback: Mutation. Remove a slot which is a fallback content of another slot.');
</script>