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https://github.com/web-platform-tests/wpt
26 December 2018, 22:31:15 UTC
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Tip revision: 5714cf6b90a4549afee19fcc37b0633d327e1cd0 authored by Alex Moshchuk on 12 April 2018, 18:55:42 UTC
Use PostTask to schedule cross-process postMessage forwarding.
Tip revision: 5714cf6
reaction-timing.html 
<!DOCTYPE html>
<html>
<head>
<title>Custom Elements: Custom element reactions must be invoked before returning to author scripts</title>
<meta name="author" title="Ryosuke Niwa" href="mailto:rniwa@webkit.org">
<meta name="assert" content="Custom element reactions must be invoked before returning to author scripts">
<link rel="help" href="https://html.spec.whatwg.org/multipage/scripting.html#invoke-custom-element-reactions">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<div id="log"></div>
<script>

class MyCustomElement extends HTMLElement {
    attributeChangedCallback(...args) {
        this.handler(...args);
    }

    handler() { }
}
MyCustomElement.observedAttributes = ['data-title', 'title'];
customElements.define('my-custom-element', MyCustomElement);

test(function () {
    var instance = document.createElement('my-custom-element');
    var anotherInstance = document.createElement('my-custom-element');

    var callbackOrder = [];
    instance.handler = function () {
        callbackOrder.push([this, 'begin']);
        anotherInstance.setAttribute('data-title', 'baz');
        callbackOrder.push([this, 'end']);
    }
    anotherInstance.handler = function () {
        callbackOrder.push([this, 'begin']);
        callbackOrder.push([this, 'end']);
    }

    instance.setAttribute('title', 'foo');
    assert_equals(callbackOrder.length, 4);

    assert_array_equals(callbackOrder[0], [instance, 'begin']);
    assert_array_equals(callbackOrder[1], [anotherInstance, 'begin']);
    assert_array_equals(callbackOrder[2], [anotherInstance, 'end']);
    assert_array_equals(callbackOrder[3], [instance, 'end']);

}, 'setAttribute and removeAttribute must enqueue and invoke attributeChangedCallback');

test(function () {
    var shouldCloneAnotherInstance = false;
    var anotherInstanceClone;
    var log = [];

    class SelfCloningElement extends HTMLElement {
        constructor() {
            super();
            log.push([this, 'begin']);
            if (shouldCloneAnotherInstance) {
                shouldCloneAnotherInstance = false;
                anotherInstanceClone = anotherInstance.cloneNode(false);
            }
            log.push([this, 'end']);
        }
    }
    customElements.define('self-cloning-element', SelfCloningElement);

    var instance = document.createElement('self-cloning-element');
    var anotherInstance = document.createElement('self-cloning-element');
    shouldCloneAnotherInstance = true;

    assert_equals(log.length, 4);
    var instanceClone = instance.cloneNode(false);

    assert_equals(log.length, 8);
    assert_array_equals(log[0], [instance, 'begin']);
    assert_array_equals(log[1], [instance, 'end']);
    assert_array_equals(log[2], [anotherInstance, 'begin']);
    assert_array_equals(log[3], [anotherInstance, 'end']);
    assert_array_equals(log[4], [instanceClone, 'begin']);
    assert_array_equals(log[5], [anotherInstanceClone, 'begin']);
    assert_array_equals(log[6], [anotherInstanceClone, 'end']);
    assert_array_equals(log[7], [instanceClone, 'end']);
}, 'Calling Node.prototype.cloneNode(false) must push a new element queue to the processing stack');

</script>
</body>
</html>
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