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+/**
+ * @fileoverview Utilities for mixed-content in Web Platform Tests.
+ * @author burnik@google.com (Kristijan Burnik)
+ * Disclaimer: Some methods of other authors are annotated in the corresponding
+ *     method's JSDoc.
+ */
+
+/**
+ * Normalizes the target port for use in a URL. For default ports, this is the
+ *     empty string (omitted port), otherwise it's a colon followed by the port
+ *     number. Ports 80, 443 and an empty string are regarded as default ports.
+ * @param {number} targetPort The port to use
+ * @return {string} The port portion for using as part of a URL.
+ */
+function getNormalizedPort(targetPort) {
+  return ([80, 443, ""].indexOf(targetPort) >= 0) ? "" : ":" + targetPort;
+}
+
+/**
+ * Creates a GUID.
+ *     See: https://en.wikipedia.org/wiki/Globally_unique_identifier
+ *     Original author: broofa (http://www.broofa.com/)
+ *     Sourced from: http://stackoverflow.com/a/2117523/4949715
+ * @return {string} A pseudo-random GUID.
+ */
+function guid() {
+  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
+    var r = Math.random() * 16 | 0, v = c == 'x' ? r : (r & 0x3 | 0x8);
+    return v.toString(16);
+  });
+}
+
+/**
+ * Initiates a new XHR via GET.
+ * @param {string} url The endpoint URL for the XHR.
+ * @param {string} responseType Optional - how should the response be parsed.
+ *     Default is "json".
+ *     See: https://xhr.spec.whatwg.org/#dom-xmlhttprequest-responsetype
+ * @return {Promise} A promise wrapping the success and error events.
+ */
+function xhrRequest(url, responseType) {
+  return new Promise(function(resolve, reject) {
+    var xhr = new XMLHttpRequest();
+    xhr.open('GET', url, true);
+    xhr.responseType = responseType || "json";
+
+    xhr.addEventListener("error", function() {
+      reject(Error("Network Error"));
+    });
+
+    xhr.addEventListener("load", function() {
+      if (xhr.status != 200)
+        return reject(Error(xhr.statusText));
+
+      resolve(xhr.response);
+    });
+
+    xhr.send();
+  });
+}
+
+/**
+ * Sets attributes on a given DOM element.
+ * @param {DOMElement} element The element on which to set the attributes.
+ * @param {object} An object with keys (serving as attribute names) and values.
+ */
+function setAttributes(el, attrs) {
+  attrs = attrs || {}
+  for (var attr in attrs)
+    el.setAttribute(attr, attrs[attr]);
+}
+
+
+/**
+ * Binds to success and error events of an object wrapping them into a promise
+ *     available through {@code element.eventPromise}. The success event
+ *     resolves and error event rejects.
+ * @param {object} element An object supporting events on which to bind the
+ *     promise.
+ * @param {string} resolveEventName [="load"] The event name to bind resolve to.
+ * @param {string} rejectEventName [="error"] The event name to bind reject to.
+ */
+function bindEvents(element, resolveEventName, rejectEventName) {
+  element.eventPromise = new Promise(function(resolve, reject) {
+    element.addEventListener(resolveEventName  || "load", resolve);
+    element.addEventListener(rejectEventName || "error",
+                             function(e) { e.preventDefault(); reject(); } );
+  });
+}
+
+/**
+ * Creates a new DOM element.
+ * @param {string} tagName The type of the DOM element.
+ * @param {object} attrs A JSON with attributes to apply to the element.
+ * @param {DOMElement} parent Optional - an existing DOM element to append to
+ *     If not provided, the returned element will remain orphaned.
+ * @param {boolean} doBindEvents Optional - Whether to bind to load and error
+ *     events and provide the promise wrapping the events via the element's
+ *     {@code eventPromise} property. Default value evaluates to false.
+ * @return {DOMElement} The newly created DOM element.
+ */
+function createElement(tagName, attrs, parent, doBindEvents) {
+  var element = document.createElement(tagName);
+
+  if (doBindEvents)
+    bindEvents(element);
+
+  // We set the attributes after binding to events to catch any
+  // event-triggering attribute changes. E.g. form submission.
+  //
+  // But be careful with images: unlike other elements they will start the load
+  // as soon as the attr is set, even if not in the document yet, and sometimes
+  // complete it synchronously, so the append doesn't have the effect we want.
+  // So for images, we want to set the attrs after appending, whereas for other
+  // elements we want to do it before appending.
+  var isImg = (tagName == "img");
+  if (!isImg)
+    setAttributes(element, attrs);
+
+  if (parent)
+    parent.appendChild(element);
+
+  if (isImg)
+    setAttributes(element, attrs);
+
+  return element;
+}
+
+function createRequestViaElement(tagName, attrs, parent) {
+  return createElement(tagName, attrs, parent, true).eventPromise;
+}
+
+/**
+ * Creates a new empty iframe and appends it to {@code document.body} .
+ * @param {string} name The name and ID of the new iframe.
+ * @param {boolean} doBindEvents Whether to bind load and error events.
+ * @return {DOMElement} The newly created iframe.
+ */
+function createHelperIframe(name, doBindEvents) {
+  return createElement("iframe",
+                       {"name": name, "id": name},
+                       document.body,
+                       doBindEvents);
+}
+
+/**
+ * Creates a new iframe, binds load and error events, sets the src attribute and
+ *     appends it to {@code document.body} .
+ * @param {string} url The src for the iframe.
+ * @return {Promise} The promise for success/error events.
+ */
+function requestViaIframe(url) {
+  return createRequestViaElement("iframe", {"src": url}, document.body);
+}
+
+/**
+ * Creates a new image, binds load and error events, sets the src attribute and
+ *     appends it to {@code document.body} .
+ * @param {string} url The src for the image.
+ * @return {Promise} The promise for success/error events.
+ */
+function requestViaImage(url) {
+  return createRequestViaElement("img", {"src": url}, document.body);
+}
+
+/**
+ * Initiates a new XHR GET request to provided URL.
+ * @param {string} url The endpoint URL for the XHR.
+ * @return {Promise} The promise for success/error events.
+ */
+function requestViaXhr(url) {
+  return xhrRequest(url);
+}
+
+/**
+ * Initiates a new GET request to provided URL via the Fetch API.
+ * @param {string} url The endpoint URL for the Fetch.
+ * @return {Promise} The promise for success/error events.
+ */
+function requestViaFetch(url) {
+  return fetch(url);
+}
+
+/**
+ * Creates a new Worker, binds message and error events wrapping them into.
+ *     {@code worker.eventPromise} and posts an empty string message to start
+ *     the worker.
+ * @param {string} url The endpoint URL for the worker script.
+ * @return {Promise} The promise for success/error events.
+ */
+function requestViaWorker(url) {
+  var worker = new Worker(url);
+  bindEvents(worker, "message", "error");
+  worker.postMessage('');
+
+  return worker.eventPromise;
+}
+
+/**
+ * Sets the href attribute on a navigable DOM element and performs a navigation
+ *     by clicking it. To avoid navigating away from the current execution
+ *     context, a target attribute is set to point to a new helper iframe.
+ * @param {DOMElement} navigableElement The navigable DOMElement
+ * @param {string} url The href for the navigable element.
+ * @return {Promise} The promise for success/error events.
+ */
+function requestViaNavigable(navigableElement, url) {
+  var iframe = createHelperIframe(guid(), true);
+  setAttributes(navigableElement,
+                {"href": url,
+                 "target": iframe.name});
+  navigableElement.click();
+
+  return iframe.eventPromise;
+}
+
+/**
+ * Creates a new anchor element, appends it to {@code document.body} and
+ *     performs the navigation.
+ * @param {string} url The URL to navigate to.
+ * @return {Promise} The promise for success/error events.
+ */
+function requestViaAnchor(url) {
+  var a = createElement("a", {"innerHTML": "Link to resource"}, document.body);
+
+  return requestViaNavigable(a, url);
+}
+
+/**
+ * Creates a new area element, appends it to {@code document.body} and performs
+ *     the navigation.
+ * @param {string} url The URL to navigate to.
+ * @return {Promise} The promise for success/error events.
+ */
+function requestViaArea(url) {
+  var area = createElement("area", {}, document.body);
+
+  return requestViaNavigable(area, url);
+}
+
+/**
+ * Creates a new script element, sets the src to url, and appends it to
+ *     {@code document.body}.
+ * @param {string} url The src URL.
+ * @return {Promise} The promise for success/error events.
+ */
+function requestViaScript(url) {
+  return createRequestViaElement("script", {"src": url}, document.body);
+}
+
+/**
+ * Creates a new form element, sets attributes, appends it to
+ *     {@code document.body} and submits the form.
+ * @param {string} url The URL to submit to.
+ * @return {Promise} The promise for success/error events.
+ */
+function requestViaForm(url) {
+  var iframe = createHelperIframe(guid());
+  var form = createElement("form",
+                           {"action": url,
+                            "method": "POST",
+                            "target": iframe.name},
+                           document.body);
+  bindEvents(iframe);
+  form.submit();
+
+  return iframe.eventPromise;
+}
+
+/**
+ * Creates a new link element for a stylesheet, binds load and error events,
+ *     sets the href to url and appends it to {@code document.head}.
+ * @param {string} url The URL for a stylesheet.
+ * @return {Promise} The promise for success/error events.
+ */
+function requestViaLinkStylesheet(url) {
+  return createRequestViaElement("link",
+                                 {"rel": "stylesheet", "href": url},
+                                 document.head);
+}
+
+/**
+ * Creates a new link element for a prefetch, binds load and error events, sets
+ *     the href to url and appends it to {@code document.head}.
+ * @param {string} url The URL of a resource to prefetch.
+ * @return {Promise} The promise for success/error events.
+ */
+function requestViaLinkPrefetch(url) {
+  // TODO(kristijanburnik): Check if prefetch should support load and error
+  // events. For now we assume it's not specified.
+  // https://developer.mozilla.org/en-US/docs/Web/HTTP/Link_prefetching_FAQ
+  return createRequestViaElement("link",
+                                 {"rel": "prefetch", "href": url},
+                                 document.head);
+}
+
+/**
+ * Creates a new media element with a child source element, binds loadeddata and
+ *     error events, sets attributes and appends to document.body.
+ * @param {string} type The type of the media element (audio/video/picture).
+ * @param {object} media_attrs The attributes for the media element.
+ * @param {object} source_attrs The attributes for the child source element.
+ * @return {DOMElement} The newly created media element.
+ */
+function createMediaElement(type, media_attrs, source_attrs) {
+  var mediaElement = createElement(type, {});
+  var sourceElement = createElement("source", {}, mediaElement);
+
+  mediaElement.eventPromise = new Promise(function(resolve, reject) {
+    mediaElement.addEventListener("loadeddata", resolve);
+    // Notice that the source element will raise the error.
+    sourceElement.addEventListener("error", reject);
+  });
+
+  setAttributes(mediaElement, media_attrs);
+  setAttributes(sourceElement, source_attrs);
+  document.body.appendChild(mediaElement);
+
+  return mediaElement;
+}
+
+/**
+ * Creates a new video element, binds loadeddata and error events, sets
+ *     attributes and source URL and appends to {@code document.body}.
+ * @param {string} url The URL of the video.
+ * @return {Promise} The promise for success/error events.
+ */
+function requestViaVideo(url) {
+  return createMediaElement("video",
+                            {},
+                            {type: "video/mp4", src: url}).eventPromise;
+}
+
+/**
+ * Creates a new audio element, binds loadeddata and error events, sets
+ *     attributes and source URL and appends to {@code document.body}.
+ * @param {string} url The URL of the audio.
+ * @return {Promise} The promise for success/error events.
+ */
+function requestViaAudio(url) {
+  return createMediaElement("audio",
+                            {},
+                            {type: "audio/mpeg", src: url}).eventPromise;
+}
+
+/**
+ * Creates a new picture element, binds loadeddata and error events, sets
+ *     attributes and source URL and appends to {@code document.body}. Also
+ *     creates new image element appending it to the picture
+ * @param {string} url The URL of the image for the source and image elements.
+ * @return {Promise} The promise for success/error events.
+ */
+function requestViaPicture(url) {
+  var picture = createMediaElement("picture", {}, {"srcset": url,
+                                                "type": "image/png"});
+  return createRequestViaElement("img", {"src": url}, picture);
+}
+
+/**
+ * Creates a new object element, binds load and error events, sets the data to
+ *     url, and appends it to {@code document.body}.
+ * @param {string} url The data URL.
+ * @return {Promise} The promise for success/error events.
+ */
+function requestViaObject(url) {
+  return createRequestViaElement("object", {"data": url}, document.body);
+}
+
+/**
+ * Creates a new WebSocket pointing to {@code url} and sends a message string
+ * "echo". The {@code message} and {@code error} events are triggering the
+ * returned promise resolve/reject events.
+ * @param {string} url The URL for WebSocket to connect to.
+ * @return {Promise} The promise for success/error events.
+ */
+function requestViaWebSocket(url) {
+  return new Promise(function(resolve, reject) {
+    var websocket = new WebSocket(url);
+
+    websocket.addEventListener("message", function(e) {
+      resolve(JSON.parse(e.data));
+    });
+
+    websocket.addEventListener("open", function(e) {
+      websocket.send("echo");
+    });
+
+    websocket.addEventListener("error", function(e) {
+      reject(e)
+    });
+  });
+}
+
+// SanityChecker does nothing in release mode. See sanity-checker.js for debug
+// mode.
+function SanityChecker() {}
+SanityChecker.prototype.checkScenario = function() {};
+SanityChecker.prototype.setFailTimeout = function(test, timeout) {};