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<!DOCTYPE html>
<title>Tests element upgrade order after adding a scoped custom element definition</title>
<meta name="author" title="Xiaocheng Hu" href="mailto:xiaochengh@chromium.org">
<link rel="help" href="https://wicg.github.io/webcomponents/proposals/Scoped-Custom-Element-Registries">
<link rel="help" href="https://github.com/WICG/webcomponents/issues/923">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<script>
let definitionCount = 0;
function nextCustomElementDefinition() {
const log = [];
const name = `test-element-${++definitionCount}`;
const constructor = class extends HTMLElement {
constructor() {
super();
log.push(this.id);
}
};
return {name, constructor, log};
}
function attachShadowForTest(t, {parent, registry}) {
parent = parent || document.body;
const host = parent.ownerDocument.createElement('div');
const shadow = host.attachShadow({mode: 'open', registry});
parent.appendChild(host);
t.add_cleanup(() => host.remove());
return shadow;
}
function createIFrameForTest(t, {parent, nextSibling}) {
parent = parent || document.body;
const iframe = parent.ownerDocument.createElement('iframe');
parent.insertBefore(iframe, nextSibling);
if (!iframe.contentDocument.body) {
iframe.contentDocument.body = iframe.contentDocument.createElement('body');
}
t.add_cleanup(() => iframe.remove());
return iframe;
}
test(t => {
const {name, constructor, log} = nextCustomElementDefinition();
const registry = new CustomElementRegistry;
const shadow = attachShadowForTest(t, {registry});
shadow.innerHTML = `
<${name} id="a"></${name}>
<${name} id="b"></${name}>
<${name} id="c"></${name}>
`;
registry.define(name, constructor);
assert_array_equals(log, ['a', 'b', 'c']);
}, 'Upgrade in tree order in the same tree scope');
test(t => {
// document
// +- shadow1
// | +- a
// | +- shadow2
// | +- b
// +- shadow3
// +- c
const {name, constructor, log} = nextCustomElementDefinition();
const registry = new CustomElementRegistry;
const shadow1 = attachShadowForTest(t, {registry});
shadow1.innerHTML = `<${name} id="a"></${name}>`;
const shadow2 = attachShadowForTest(t, {registry, parent: shadow1});
shadow2.innerHTML = `<${name} id="b"></${name}>`;
const shadow3 = attachShadowForTest(t, {registry});
shadow3.innerHTML = `<${name} id="c"></${name}>`;
registry.define(name, constructor);
assert_array_equals(log, ['a', 'b', 'c']);
}, 'Upgrade in shadow-including tree order across tree scopes');
test(t => {
// document
// +- shadow1
// | +- a
// | +- shadow3
// | +- c
// +- shadow2
// +- b
const {name, constructor, log} = nextCustomElementDefinition();
const registry = new CustomElementRegistry;
const shadow1 = attachShadowForTest(t, {registry});
shadow1.innerHTML = `<${name} id="a"></${name}>`;
const shadow2 = attachShadowForTest(t, {registry});
shadow2.innerHTML = `<${name} id="b"></${name}>`;
const shadow3 = attachShadowForTest(t, {registry, parent: shadow1});
shadow3.innerHTML = `<${name} id="c"></${name}>`;
registry.define(name, constructor);
assert_array_equals(log, ['a', 'c', 'b']);
}, 'Upgrade order does not depend on shadow root attach order');
test(t => {
// document
// +- iframe1
// | +- shadow1
// | | +- a
// | +- iframe2
// | +- shadow2
// | +- b
// +- shadow3
// +- c
const {name, constructor, log} = nextCustomElementDefinition();
const registry = new CustomElementRegistry;
const iframe1 = createIFrameForTest(t, {});
const shadow1 = attachShadowForTest(t, {registry, parent: iframe1.contentDocument.body});
shadow1.innerHTML = `<${name} id="a"></${name}>`;
const iframe2 = createIFrameForTest(t, {parent: iframe1.contentDocument.body});
const shadow2 = attachShadowForTest(t, {registry, parent: iframe2.contentDocument.body});
shadow2.innerHTML = `<${name} id="b"></${name}>`;
const shadow3 = attachShadowForTest(t, {registry});
shadow3.innerHTML = `<${name} id="c"></${name}>`;
registry.define(name, constructor);
assert_array_equals(log, ['a', 'b', 'c']);
}, 'Upgrade in association order across documents, then tree order in each document');
test(t => {
// document
// +- iframe2
// | +- shadow2
// | +- b
// +- iframe1
// | +- shadow1
// | +- a
const {name, constructor, log} = nextCustomElementDefinition();
const registry = new CustomElementRegistry;
const iframe1 = createIFrameForTest(t, {});
const shadow1 = attachShadowForTest(t, {registry, parent: iframe1.contentDocument.body});
shadow1.innerHTML = `<${name} id="a"></${name}>`;
const iframe2 = createIFrameForTest(t, {nextSibling: iframe1});
const shadow2 = attachShadowForTest(t, {registry, parent: iframe2.contentDocument.body});
shadow2.innerHTML = `<${name} id="b"></${name}>`;
registry.define(name, constructor);
assert_array_equals(log, ['a', 'b']);
}, 'Upgrade order is not affected by DOM order between child frames');
test(t => {
// document
// +- iframe1
// | +- shadow2
// | +- b
// +- iframe2
// | +- shadow1
// | +- a
const {name, constructor, log} = nextCustomElementDefinition();
const registry = new CustomElementRegistry;
const iframe1 = createIFrameForTest(t, {});
const iframe2 = createIFrameForTest(t, {});
const shadow1 = attachShadowForTest(t, {registry});
const host1 = shadow1.host;
shadow1.innerHTML = `<${name} id="a"></${name}>`;
const shadow2 = attachShadowForTest(t, {registry});
const host2 = shadow2.host;
shadow2.innerHTML = `<${name} id="b"></${name}>`;
iframe1.contentDocument.body.appendChild(host2);
iframe2.contentDocument.body.appendChild(host1);
registry.define(name, constructor);
assert_array_equals(log, ['b', 'a']);
}, 'Upgrade order is affected by shadow tree adoption across documents');
test(t => {
// Create a registry in one window, but associate it with another document first
// document
// +- iframe1
// | +- shadow1
// | +- a
// +- shadowr2
// +- b
const {name, constructor, log} = nextCustomElementDefinition();
const registry = new CustomElementRegistry;
const iframe1 = createIFrameForTest(t, {});
const shadow1 = attachShadowForTest(t, {registry, parent: iframe1.contentDocument.body});
shadow1.innerHTML = `<${name} id="a"></${name}>`;
const shadow2 = attachShadowForTest(t, {registry});
shadow2.innerHTML = `<${name} id="b"></${name}>`;
registry.define(name, constructor);
assert_array_equals(log, ['a', 'b']);
}, 'Elements in the "owner" window of a scoped registry are not always upgraded first');
</script>
</body>
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