Import wpt@357b83b809e3cbc7a1805e7c3ca108a7980d782f

third_party/WebKit/LayoutTests/imported/wpt/custom-elements/resources/custom-elements-helpers.js

 function create_window_in_test(t, srcdoc) {
   let p = new Promise((resolve) => {
     let f = document.createElement('iframe');
     f.srcdoc = srcdoc ? srcdoc : '';
     f.onload = (event) => {
       let w = f.contentWindow;
       t.add_cleanup(() => f.parentNode && f.remove());
       resolve(w);
     };
     document.body.appendChild(f);
   });
   return p;
 }
 
 function test_with_window(f, name, srcdoc) {
   promise_test((t) => {
     return create_window_in_test(t, srcdoc)
     .then((w) => {
       f(w);
     });
   }, name);
 }
+
+function create_attribute_changed_callback_log(element, name, oldValue, newValue, namespace) {
+    return {
+        type: 'attributeChanged',
+        element: element,
+        name: name,
+        namespace: namespace,
+        oldValue: oldValue,
+        newValue: newValue,
+        actualValue: element.getAttributeNS(namespace, name)
+    };
+}
+
+function assert_attribute_log_entry(log, expected) {
+    assert_equals(log.type, 'attributeChanged');
+    assert_equals(log.name, expected.name);
+    assert_equals(log.oldValue, expected.oldValue);
+    assert_equals(log.newValue, expected.newValue);
+    assert_equals(log.actualValue, expected.newValue);
+    assert_equals(log.namespace, expected.namespace);
+}
+
+
+function define_new_custom_element(observedAttributes) {
+    let log = [];
+    let name = 'custom-element-' + define_new_custom_element._element_number++;
+
+    class CustomElement extends HTMLElement {
+        constructor() {
+            super();
+            log.push({type: 'constructed', element: this});
+        }
+        attributeChangedCallback(...args) {
+            log.push(create_attribute_changed_callback_log(this, ...args));
+        }
+        connectedCallback() { log.push({type: 'connected', element: this}); }
+        disconnectedCallback() { log.push({type: 'disconnected', element: this}); }
+        adoptedCallback(oldDocument, newDocument) { log.push({type: 'adopted', element: this, oldDocument: oldDocument, newDocument: newDocument}); }
+    }
+    CustomElement.observedAttributes = observedAttributes;
+
+    customElements.define(name, CustomElement);
+
+    return {
+        name: name,
+        takeLog: function () {
+            let currentLog = log; log = [];
+            currentLog.types = () => currentLog.map((entry) => entry.type);
+            currentLog.last = () => currentLog[currentLog.length - 1];
+            return currentLog;
+        }
+    };
+}
+define_new_custom_element._element_number = 1;
+
+function document_types() {
+    return [
+        {
+            name: 'the document',
+            create: function () { return Promise.resolve(document); },
+            isOwner: true,
+            hasBrowsingContext: true,
+        },
+        {
+            name: 'the document of the template elements',
+            create: function () {
+                return new Promise(function (resolve) {
+                    var template = document.createElementNS('http://www.w3.org/1999/xhtml', 'template');
+                    var doc = template.content.ownerDocument;
+                    if (!doc.documentElement)
+                        doc.appendChild(doc.createElement('html'));
+                    resolve(doc);
+                });
+            },
+            hasBrowsingContext: false,
+        },
+        {
+            name: 'a new document',
+            create: function () {
+                return new Promise(function (resolve) {
+                    var doc = new Document();
+                    doc.appendChild(doc.createElement('html'));
+                    resolve(doc);
+                });
+            },
+            hasBrowsingContext: false,
+        },
+        {
+            name: 'a cloned document',
+            create: function () {
+                return new Promise(function (resolve) {
+                    var doc = document.cloneNode(false);
+                    doc.appendChild(doc.createElement('html'));
+                    resolve(doc);
+                });
+            },
+            hasBrowsingContext: false,
+        },
+        {
+            name: 'a document created by createHTMLDocument',
+            create: function () {
+                return Promise.resolve(document.implementation.createHTMLDocument());
+            },
+            hasBrowsingContext: false,
+        },
+        {
+            name: 'an HTML document created by createDocument',
+            create: function () {
+                return Promise.resolve(document.implementation.createDocument('http://www.w3.org/1999/xhtml', 'html', null));
+            },
+            hasBrowsingContext: false,
+        },
+        {
+            name: 'the document of an iframe',
+            create: function () {
+                return new Promise(function (resolve, reject) {
+                    var iframe = document.createElement('iframe');
+                    iframe.onload = function () { resolve(iframe.contentDocument); }
+                    iframe.onerror = function () { reject('Failed to load an empty iframe'); }
+                    document.body.appendChild(iframe);
+                });
+            },
+            hasBrowsingContext: true,
+        },
+        {
+            name: 'an HTML document fetched by XHR',
+            create: function () {
+                return new Promise(function (resolve, reject) {
+                    var xhr = new XMLHttpRequest();
+                    xhr.open('GET', 'resources/empty-html-document.html');
+                    xhr.overrideMimeType('text/xml');
+                    xhr.onload = function () { resolve(xhr.responseXML); }
+                    xhr.onerror = function () { reject('Failed to fetch the document'); }
+                    xhr.send();
+                });
+            },
+            hasBrowsingContext: false,
+        }
+    ];
+}