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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const lazy = {};
+
+ChromeUtils.defineESModuleGetters(lazy, {
+ atom: "chrome://remote/content/marionette/atom.sys.mjs",
+ error: "chrome://remote/content/shared/webdriver/Errors.sys.mjs",
+ PollPromise: "chrome://remote/content/marionette/sync.sys.mjs",
+});
+
+const ORDERED_NODE_ITERATOR_TYPE = 5;
+const FIRST_ORDERED_NODE_TYPE = 9;
+
+const DOCUMENT_FRAGMENT_NODE = 11;
+const ELEMENT_NODE = 1;
+
+const XUL_NS = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";
+
+/** XUL elements that support checked property. */
+const XUL_CHECKED_ELS = new Set(["button", "checkbox", "toolbarbutton"]);
+
+/** XUL elements that support selected property. */
+const XUL_SELECTED_ELS = new Set([
+ "menu",
+ "menuitem",
+ "menuseparator",
+ "radio",
+ "richlistitem",
+ "tab",
+]);
+
+/**
+ * This module provides shared functionality for dealing with DOM-
+ * and web elements in Marionette.
+ *
+ * A web element is an abstraction used to identify an element when it
+ * is transported across the protocol, between remote- and local ends.
+ *
+ * Each element has an associated web element reference (a UUID) that
+ * uniquely identifies the the element across all browsing contexts. The
+ * web element reference for every element representing the same element
+ * is the same.
+ *
+ * @namespace
+ */
+export const dom = {};
+
+dom.Strategy = {
+ ClassName: "class name",
+ Selector: "css selector",
+ ID: "id",
+ Name: "name",
+ LinkText: "link text",
+ PartialLinkText: "partial link text",
+ TagName: "tag name",
+ XPath: "xpath",
+};
+
+/**
+ * Find a single element or a collection of elements starting at the
+ * document root or a given node.
+ *
+ * If |timeout| is above 0, an implicit search technique is used.
+ * This will wait for the duration of <var>timeout</var> for the
+ * element to appear in the DOM.
+ *
+ * See the {@link dom.Strategy} enum for a full list of supported
+ * search strategies that can be passed to <var>strategy</var>.
+ *
+ * @param {Object<string, WindowProxy>} container
+ * Window object.
+ * @param {string} strategy
+ * Search strategy whereby to locate the element(s).
+ * @param {string} selector
+ * Selector search pattern. The selector must be compatible with
+ * the chosen search <var>strategy</var>.
+ * @param {object=} options
+ * @param {boolean=} options.all
+ * If true, a multi-element search selector is used and a sequence of
+ * elements will be returned, otherwise a single element. Defaults to false.
+ * @param {Element=} options.startNode
+ * Element to use as the root of the search.
+ * @param {number=} options.timeout
+ * Duration to wait before timing out the search. If <code>all</code>
+ * is false, a {@link NoSuchElementError} is thrown if unable to
+ * find the element within the timeout duration.
+ *
+ * @returns {Promise.<(Element|Array.<Element>)>}
+ * Single element or a sequence of elements.
+ *
+ * @throws InvalidSelectorError
+ * If <var>strategy</var> is unknown.
+ * @throws InvalidSelectorError
+ * If <var>selector</var> is malformed.
+ * @throws NoSuchElementError
+ * If a single element is requested, this error will throw if the
+ * element is not found.
+ */
+dom.find = function (container, strategy, selector, options = {}) {
+ const { all = false, startNode, timeout = 0 } = options;
+
+ let searchFn;
+ if (all) {
+ searchFn = findElements.bind(this);
+ } else {
+ searchFn = findElement.bind(this);
+ }
+
+ return new Promise((resolve, reject) => {
+ let findElements = new lazy.PollPromise(
+ async (resolve, reject) => {
+ try {
+ let res = await find_(container, strategy, selector, searchFn, {
+ all,
+ startNode,
+ });
+ if (res.length) {
+ resolve(Array.from(res));
+ } else {
+ reject([]);
+ }
+ } catch (e) {
+ reject(e);
+ }
+ },
+ { timeout }
+ );
+
+ findElements.then(foundEls => {
+ // the following code ought to be moved into findElement
+ // and findElements when bug 1254486 is addressed
+ if (!all && (!foundEls || !foundEls.length)) {
+ let msg = `Unable to locate element: ${selector}`;
+ reject(new lazy.error.NoSuchElementError(msg));
+ }
+
+ if (all) {
+ resolve(foundEls);
+ }
+ resolve(foundEls[0]);
+ }, reject);
+ });
+};
+
+async function find_(
+ container,
+ strategy,
+ selector,
+ searchFn,
+ { startNode = null, all = false } = {}
+) {
+ let rootNode;
+
+ if (dom.isShadowRoot(startNode)) {
+ rootNode = startNode.ownerDocument;
+ } else {
+ rootNode = container.frame.document;
+ }
+
+ if (!startNode) {
+ startNode = rootNode;
+ }
+
+ let res;
+ try {
+ res = await searchFn(strategy, selector, rootNode, startNode);
+ } catch (e) {
+ throw new lazy.error.InvalidSelectorError(
+ `Given ${strategy} expression "${selector}" is invalid: ${e}`
+ );
+ }
+
+ if (res) {
+ if (all) {
+ return res;
+ }
+ return [res];
+ }
+ return [];
+}
+
+/**
+ * Find a single element by XPath expression.
+ *
+ * @param {Document} document
+ * Document root.
+ * @param {Element} startNode
+ * Where in the DOM hiearchy to begin searching.
+ * @param {string} expression
+ * XPath search expression.
+ *
+ * @returns {Node}
+ * First element matching <var>expression</var>.
+ */
+dom.findByXPath = function (document, startNode, expression) {
+ let iter = document.evaluate(
+ expression,
+ startNode,
+ null,
+ FIRST_ORDERED_NODE_TYPE,
+ null
+ );
+ return iter.singleNodeValue;
+};
+
+/**
+ * Find elements by XPath expression.
+ *
+ * @param {Document} document
+ * Document root.
+ * @param {Element} startNode
+ * Where in the DOM hierarchy to begin searching.
+ * @param {string} expression
+ * XPath search expression.
+ *
+ * @returns {Iterable.<Node>}
+ * Iterator over nodes matching <var>expression</var>.
+ */
+dom.findByXPathAll = function* (document, startNode, expression) {
+ let iter = document.evaluate(
+ expression,
+ startNode,
+ null,
+ ORDERED_NODE_ITERATOR_TYPE,
+ null
+ );
+ let el = iter.iterateNext();
+ while (el) {
+ yield el;
+ el = iter.iterateNext();
+ }
+};
+
+/**
+ * Find all hyperlinks descendant of <var>startNode</var> which
+ * link text is <var>linkText</var>.
+ *
+ * @param {Element} startNode
+ * Where in the DOM hierarchy to begin searching.
+ * @param {string} linkText
+ * Link text to search for.
+ *
+ * @returns {Iterable.<HTMLAnchorElement>}
+ * Sequence of link elements which text is <var>s</var>.
+ */
+dom.findByLinkText = function (startNode, linkText) {
+ return filterLinks(startNode, async link => {
+ const visibleText = await lazy.atom.getVisibleText(link, link.ownerGlobal);
+ return visibleText.trim() === linkText;
+ });
+};
+
+/**
+ * Find all hyperlinks descendant of <var>startNode</var> which
+ * link text contains <var>linkText</var>.
+ *
+ * @param {Element} startNode
+ * Where in the DOM hierachy to begin searching.
+ * @param {string} linkText
+ * Link text to search for.
+ *
+ * @returns {Iterable.<HTMLAnchorElement>}
+ * Iterator of link elements which text containins
+ * <var>linkText</var>.
+ */
+dom.findByPartialLinkText = function (startNode, linkText) {
+ return filterLinks(startNode, async link => {
+ const visibleText = await lazy.atom.getVisibleText(link, link.ownerGlobal);
+
+ return visibleText.includes(linkText);
+ });
+};
+
+/**
+ * Filters all hyperlinks that are descendant of <var>startNode</var>
+ * by <var>predicate</var>.
+ *
+ * @param {Element} startNode
+ * Where in the DOM hierarchy to begin searching.
+ * @param {function(HTMLAnchorElement): boolean} predicate
+ * Function that determines if given link should be included in
+ * return value or filtered away.
+ *
+ * @returns {Array.<HTMLAnchorElement>}
+ * Array of link elements matching <var>predicate</var>.
+ */
+async function filterLinks(startNode, predicate) {
+ const links = [];
+
+ for (const link of getLinks(startNode)) {
+ if (await predicate(link)) {
+ links.push(link);
+ }
+ }
+
+ return links;
+}
+
+/**
+ * Finds a single element.
+ *
+ * @param {dom.Strategy} strategy
+ * Selector strategy to use.
+ * @param {string} selector
+ * Selector expression.
+ * @param {Document} document
+ * Document root.
+ * @param {Element=} startNode
+ * Optional Element from which to start searching.
+ *
+ * @returns {Element}
+ * Found element.
+ *
+ * @throws {InvalidSelectorError}
+ * If strategy <var>using</var> is not recognised.
+ * @throws {Error}
+ * If selector expression <var>selector</var> is malformed.
+ */
+async function findElement(
+ strategy,
+ selector,
+ document,
+ startNode = undefined
+) {
+ switch (strategy) {
+ case dom.Strategy.ID: {
+ if (startNode.getElementById) {
+ return startNode.getElementById(selector);
+ }
+ let expr = `.//*[@id="${selector}"]`;
+ return dom.findByXPath(document, startNode, expr);
+ }
+
+ case dom.Strategy.Name: {
+ if (startNode.getElementsByName) {
+ return startNode.getElementsByName(selector)[0];
+ }
+ let expr = `.//*[@name="${selector}"]`;
+ return dom.findByXPath(document, startNode, expr);
+ }
+
+ case dom.Strategy.ClassName:
+ return startNode.getElementsByClassName(selector)[0];
+
+ case dom.Strategy.TagName:
+ return startNode.getElementsByTagName(selector)[0];
+
+ case dom.Strategy.XPath:
+ return dom.findByXPath(document, startNode, selector);
+
+ case dom.Strategy.LinkText: {
+ const links = getLinks(startNode);
+ for (const link of links) {
+ const visibleText = await lazy.atom.getVisibleText(
+ link,
+ link.ownerGlobal
+ );
+ if (visibleText.trim() === selector) {
+ return link;
+ }
+ }
+ return undefined;
+ }
+
+ case dom.Strategy.PartialLinkText: {
+ const links = getLinks(startNode);
+ for (const link of links) {
+ const visibleText = await lazy.atom.getVisibleText(
+ link,
+ link.ownerGlobal
+ );
+ if (visibleText.includes(selector)) {
+ return link;
+ }
+ }
+ return undefined;
+ }
+
+ case dom.Strategy.Selector:
+ try {
+ return startNode.querySelector(selector);
+ } catch (e) {
+ throw new lazy.error.InvalidSelectorError(
+ `${e.message}: "${selector}"`
+ );
+ }
+ }
+
+ throw new lazy.error.InvalidSelectorError(`No such strategy: ${strategy}`);
+}
+
+/**
+ * Find multiple elements.
+ *
+ * @param {dom.Strategy} strategy
+ * Selector strategy to use.
+ * @param {string} selector
+ * Selector expression.
+ * @param {Document} document
+ * Document root.
+ * @param {Element=} startNode
+ * Optional Element from which to start searching.
+ *
+ * @returns {Array.<Element>}
+ * Found elements.
+ *
+ * @throws {InvalidSelectorError}
+ * If strategy <var>strategy</var> is not recognised.
+ * @throws {Error}
+ * If selector expression <var>selector</var> is malformed.
+ */
+async function findElements(
+ strategy,
+ selector,
+ document,
+ startNode = undefined
+) {
+ switch (strategy) {
+ case dom.Strategy.ID:
+ selector = `.//*[@id="${selector}"]`;
+
+ // fall through
+ case dom.Strategy.XPath:
+ return [...dom.findByXPathAll(document, startNode, selector)];
+
+ case dom.Strategy.Name:
+ if (startNode.getElementsByName) {
+ return startNode.getElementsByName(selector);
+ }
+ return [
+ ...dom.findByXPathAll(document, startNode, `.//*[@name="${selector}"]`),
+ ];
+
+ case dom.Strategy.ClassName:
+ return startNode.getElementsByClassName(selector);
+
+ case dom.Strategy.TagName:
+ return startNode.getElementsByTagName(selector);
+
+ case dom.Strategy.LinkText:
+ return [...(await dom.findByLinkText(startNode, selector))];
+
+ case dom.Strategy.PartialLinkText:
+ return [...(await dom.findByPartialLinkText(startNode, selector))];
+
+ case dom.Strategy.Selector:
+ return startNode.querySelectorAll(selector);
+
+ default:
+ throw new lazy.error.InvalidSelectorError(
+ `No such strategy: ${strategy}`
+ );
+ }
+}
+
+function getLinks(startNode) {
+ // DocumentFragment doesn't have `getElementsByTagName` so using `querySelectorAll`.
+ if (dom.isShadowRoot(startNode)) {
+ return startNode.querySelectorAll("a");
+ }
+ return startNode.getElementsByTagName("a");
+}
+
+/**
+ * Finds the closest parent node of <var>startNode</var> matching a CSS
+ * <var>selector</var> expression.
+ *
+ * @param {Node} startNode
+ * Cycle through <var>startNode</var>'s parent nodes in tree-order
+ * and return the first match to <var>selector</var>.
+ * @param {string} selector
+ * CSS selector expression.
+ *
+ * @returns {Node=}
+ * First match to <var>selector</var>, or null if no match was found.
+ */
+dom.findClosest = function (startNode, selector) {
+ let node = startNode;
+ while (node.parentNode && node.parentNode.nodeType == ELEMENT_NODE) {
+ node = node.parentNode;
+ if (node.matches(selector)) {
+ return node;
+ }
+ }
+ return null;
+};
+
+/**
+ * Determines if <var>obj<var> is an HTML or JS collection.
+ *
+ * @param {object} seq
+ * Type to determine.
+ *
+ * @returns {boolean}
+ * True if <var>seq</va> is a collection.
+ */
+dom.isCollection = function (seq) {
+ switch (Object.prototype.toString.call(seq)) {
+ case "[object Arguments]":
+ case "[object Array]":
+ case "[object DOMTokenList]":
+ case "[object FileList]":
+ case "[object HTMLAllCollection]":
+ case "[object HTMLCollection]":
+ case "[object HTMLFormControlsCollection]":
+ case "[object HTMLOptionsCollection]":
+ case "[object NodeList]":
+ return true;
+
+ default:
+ return false;
+ }
+};
+
+/**
+ * Determines if <var>shadowRoot</var> is detached.
+ *
+ * A ShadowRoot is detached if its node document is not the active document
+ * or if the element node referred to as its host is stale.
+ *
+ * @param {ShadowRoot} shadowRoot
+ * ShadowRoot to check for detached state.
+ *
+ * @returns {boolean}
+ * True if <var>shadowRoot</var> is detached, false otherwise.
+ */
+dom.isDetached = function (shadowRoot) {
+ return !shadowRoot.ownerDocument.isActive() || dom.isStale(shadowRoot.host);
+};
+
+/**
+ * Determines if <var>el</var> is stale.
+ *
+ * An element is stale if its node document is not the active document
+ * or if it is not connected.
+ *
+ * @param {Element} el
+ * Element to check for staleness.
+ *
+ * @returns {boolean}
+ * True if <var>el</var> is stale, false otherwise.
+ */
+dom.isStale = function (el) {
+ if (!el.ownerGlobal) {
+ // Without a valid inner window the document is basically closed.
+ return true;
+ }
+
+ return !el.ownerDocument.isActive() || !el.isConnected;
+};
+
+/**
+ * Determine if <var>el</var> is selected or not.
+ *
+ * This operation only makes sense on
+ * <tt>&lt;input type=checkbox&gt;</tt>,
+ * <tt>&lt;input type=radio&gt;</tt>,
+ * and <tt>&gt;option&gt;</tt> elements.
+ *
+ * @param {Element} el
+ * Element to test if selected.
+ *
+ * @returns {boolean}
+ * True if element is selected, false otherwise.
+ */
+dom.isSelected = function (el) {
+ if (!el) {
+ return false;
+ }
+
+ if (dom.isXULElement(el)) {
+ if (XUL_CHECKED_ELS.has(el.tagName)) {
+ return el.checked;
+ } else if (XUL_SELECTED_ELS.has(el.tagName)) {
+ return el.selected;
+ }
+ } else if (dom.isDOMElement(el)) {
+ if (el.localName == "input" && ["checkbox", "radio"].includes(el.type)) {
+ return el.checked;
+ } else if (el.localName == "option") {
+ return el.selected;
+ }
+ }
+
+ return false;
+};
+
+/**
+ * An element is considered read only if it is an
+ * <code>&lt;input&gt;</code> or <code>&lt;textarea&gt;</code>
+ * element whose <code>readOnly</code> content IDL attribute is set.
+ *
+ * @param {Element} el
+ * Element to test is read only.
+ *
+ * @returns {boolean}
+ * True if element is read only.
+ */
+dom.isReadOnly = function (el) {
+ return (
+ dom.isDOMElement(el) &&
+ ["input", "textarea"].includes(el.localName) &&
+ el.readOnly
+ );
+};
+
+/**
+ * An element is considered disabled if it is a an element
+ * that can be disabled, or it belongs to a container group which
+ * <code>disabled</code> content IDL attribute affects it.
+ *
+ * @param {Element} el
+ * Element to test for disabledness.
+ *
+ * @returns {boolean}
+ * True if element, or its container group, is disabled.
+ */
+dom.isDisabled = function (el) {
+ if (!dom.isDOMElement(el)) {
+ return false;
+ }
+
+ switch (el.localName) {
+ case "option":
+ case "optgroup":
+ if (el.disabled) {
+ return true;
+ }
+ let parent = dom.findClosest(el, "optgroup,select");
+ return dom.isDisabled(parent);
+
+ case "button":
+ case "input":
+ case "select":
+ case "textarea":
+ return el.disabled;
+
+ default:
+ return false;
+ }
+};
+
+/**
+ * Denotes elements that can be used for typing and clearing.
+ *
+ * Elements that are considered WebDriver-editable are non-readonly
+ * and non-disabled <code>&lt;input&gt;</code> elements in the Text,
+ * Search, URL, Telephone, Email, Password, Date, Month, Date and
+ * Time Local, Number, Range, Color, and File Upload states, and
+ * <code>&lt;textarea&gt;</code> elements.
+ *
+ * @param {Element} el
+ * Element to test.
+ *
+ * @returns {boolean}
+ * True if editable, false otherwise.
+ */
+dom.isMutableFormControl = function (el) {
+ if (!dom.isDOMElement(el)) {
+ return false;
+ }
+ if (dom.isReadOnly(el) || dom.isDisabled(el)) {
+ return false;
+ }
+
+ if (el.localName == "textarea") {
+ return true;
+ }
+
+ if (el.localName != "input") {
+ return false;
+ }
+
+ switch (el.type) {
+ case "color":
+ case "date":
+ case "datetime-local":
+ case "email":
+ case "file":
+ case "month":
+ case "number":
+ case "password":
+ case "range":
+ case "search":
+ case "tel":
+ case "text":
+ case "time":
+ case "url":
+ case "week":
+ return true;
+
+ default:
+ return false;
+ }
+};
+
+/**
+ * An editing host is a node that is either an HTML element with a
+ * <code>contenteditable</code> attribute, or the HTML element child
+ * of a document whose <code>designMode</code> is enabled.
+ *
+ * @param {Element} el
+ * Element to determine if is an editing host.
+ *
+ * @returns {boolean}
+ * True if editing host, false otherwise.
+ */
+dom.isEditingHost = function (el) {
+ return (
+ dom.isDOMElement(el) &&
+ (el.isContentEditable || el.ownerDocument.designMode == "on")
+ );
+};
+
+/**
+ * Determines if an element is editable according to WebDriver.
+ *
+ * An element is considered editable if it is not read-only or
+ * disabled, and one of the following conditions are met:
+ *
+ * <ul>
+ * <li>It is a <code>&lt;textarea&gt;</code> element.
+ *
+ * <li>It is an <code>&lt;input&gt;</code> element that is not of
+ * the <code>checkbox</code>, <code>radio</code>, <code>hidden</code>,
+ * <code>submit</code>, <code>button</code>, or <code>image</code> types.
+ *
+ * <li>It is content-editable.
+ *
+ * <li>It belongs to a document in design mode.
+ * </ul>
+ *
+ * @param {Element} el
+ * Element to test if editable.
+ *
+ * @returns {boolean}
+ * True if editable, false otherwise.
+ */
+dom.isEditable = function (el) {
+ if (!dom.isDOMElement(el)) {
+ return false;
+ }
+
+ if (dom.isReadOnly(el) || dom.isDisabled(el)) {
+ return false;
+ }
+
+ return dom.isMutableFormControl(el) || dom.isEditingHost(el);
+};
+
+/**
+ * This function generates a pair of coordinates relative to the viewport
+ * given a target element and coordinates relative to that element's
+ * top-left corner.
+ *
+ * @param {Node} node
+ * Target node.
+ * @param {number=} xOffset
+ * Horizontal offset relative to target's top-left corner.
+ * Defaults to the centre of the target's bounding box.
+ * @param {number=} yOffset
+ * Vertical offset relative to target's top-left corner. Defaults to
+ * the centre of the target's bounding box.
+ *
+ * @returns {Object<string, number>}
+ * X- and Y coordinates.
+ *
+ * @throws TypeError
+ * If <var>xOffset</var> or <var>yOffset</var> are not numbers.
+ */
+dom.coordinates = function (node, xOffset = undefined, yOffset = undefined) {
+ let box = node.getBoundingClientRect();
+
+ if (typeof xOffset == "undefined" || xOffset === null) {
+ xOffset = box.width / 2.0;
+ }
+ if (typeof yOffset == "undefined" || yOffset === null) {
+ yOffset = box.height / 2.0;
+ }
+
+ if (typeof yOffset != "number" || typeof xOffset != "number") {
+ throw new TypeError("Offset must be a number");
+ }
+
+ return {
+ x: box.left + xOffset,
+ y: box.top + yOffset,
+ };
+};
+
+/**
+ * This function returns true if the node is in the viewport.
+ *
+ * @param {Element} el
+ * Target element.
+ * @param {number=} x
+ * Horizontal offset relative to target. Defaults to the centre of
+ * the target's bounding box.
+ * @param {number=} y
+ * Vertical offset relative to target. Defaults to the centre of
+ * the target's bounding box.
+ *
+ * @returns {boolean}
+ * True if if <var>el</var> is in viewport, false otherwise.
+ */
+dom.inViewport = function (el, x = undefined, y = undefined) {
+ let win = el.ownerGlobal;
+ let c = dom.coordinates(el, x, y);
+ let vp = {
+ top: win.pageYOffset,
+ left: win.pageXOffset,
+ bottom: win.pageYOffset + win.innerHeight,
+ right: win.pageXOffset + win.innerWidth,
+ };
+
+ return (
+ vp.left <= c.x + win.pageXOffset &&
+ c.x + win.pageXOffset <= vp.right &&
+ vp.top <= c.y + win.pageYOffset &&
+ c.y + win.pageYOffset <= vp.bottom
+ );
+};
+
+/**
+ * Gets the element's container element.
+ *
+ * An element container is defined by the WebDriver
+ * specification to be an <tt>&lt;option&gt;</tt> element in a
+ * <a href="https://html.spec.whatwg.org/#concept-element-contexts">valid
+ * element context</a>, meaning that it has an ancestral element
+ * that is either <tt>&lt;datalist&gt;</tt> or <tt>&lt;select&gt;</tt>.
+ *
+ * If the element does not have a valid context, its container element
+ * is itself.
+ *
+ * @param {Element} el
+ * Element to get the container of.
+ *
+ * @returns {Element}
+ * Container element of <var>el</var>.
+ */
+dom.getContainer = function (el) {
+ // Does <option> or <optgroup> have a valid context,
+ // meaning is it a child of <datalist> or <select>?
+ if (["option", "optgroup"].includes(el.localName)) {
+ return dom.findClosest(el, "datalist,select") || el;
+ }
+
+ return el;
+};
+
+/**
+ * An element is in view if it is a member of its own pointer-interactable
+ * paint tree.
+ *
+ * This means an element is considered to be in view, but not necessarily
+ * pointer-interactable, if it is found somewhere in the
+ * <code>elementsFromPoint</code> list at <var>el</var>'s in-view
+ * centre coordinates.
+ *
+ * Before running the check, we change <var>el</var>'s pointerEvents
+ * style property to "auto", since elements without pointer events
+ * enabled do not turn up in the paint tree we get from
+ * document.elementsFromPoint. This is a specialisation that is only
+ * relevant when checking if the element is in view.
+ *
+ * @param {Element} el
+ * Element to check if is in view.
+ *
+ * @returns {boolean}
+ * True if <var>el</var> is inside the viewport, or false otherwise.
+ */
+dom.isInView = function (el) {
+ let originalPointerEvents = el.style.pointerEvents;
+
+ try {
+ el.style.pointerEvents = "auto";
+ const tree = dom.getPointerInteractablePaintTree(el);
+
+ // Bug 1413493 - <tr> is not part of the returned paint tree yet. As
+ // workaround check the visibility based on the first contained cell.
+ if (el.localName === "tr" && el.cells && el.cells.length) {
+ return tree.includes(el.cells[0]);
+ }
+
+ return tree.includes(el);
+ } finally {
+ el.style.pointerEvents = originalPointerEvents;
+ }
+};
+
+/**
+ * This function throws the visibility of the element error if the element is
+ * not displayed or the given coordinates are not within the viewport.
+ *
+ * @param {Element} el
+ * Element to check if visible.
+ * @param {number=} x
+ * Horizontal offset relative to target. Defaults to the centre of
+ * the target's bounding box.
+ * @param {number=} y
+ * Vertical offset relative to target. Defaults to the centre of
+ * the target's bounding box.
+ *
+ * @returns {boolean}
+ * True if visible, false otherwise.
+ */
+dom.isVisible = async function (el, x = undefined, y = undefined) {
+ let win = el.ownerGlobal;
+
+ if (!(await lazy.atom.isElementDisplayed(el, win))) {
+ return false;
+ }
+
+ if (el.tagName.toLowerCase() == "body") {
+ return true;
+ }
+
+ if (!dom.inViewport(el, x, y)) {
+ dom.scrollIntoView(el);
+ if (!dom.inViewport(el)) {
+ return false;
+ }
+ }
+ return true;
+};
+
+/**
+ * A pointer-interactable element is defined to be the first
+ * non-transparent element, defined by the paint order found at the centre
+ * point of its rectangle that is inside the viewport, excluding the size
+ * of any rendered scrollbars.
+ *
+ * An element is obscured if the pointer-interactable paint tree at its
+ * centre point is empty, or the first element in this tree is not an
+ * inclusive descendant of itself.
+ *
+ * @param {DOMElement} el
+ * Element determine if is pointer-interactable.
+ *
+ * @returns {boolean}
+ * True if element is obscured, false otherwise.
+ */
+dom.isObscured = function (el) {
+ let tree = dom.getPointerInteractablePaintTree(el);
+ return !el.contains(tree[0]);
+};
+
+// TODO(ato): Only used by deprecated action API
+// https://bugzil.la/1354578
+/**
+ * Calculates the in-view centre point of an element's client rect.
+ *
+ * The portion of an element that is said to be _in view_, is the
+ * intersection of two squares: the first square being the initial
+ * viewport, and the second a DOM element. From this square we
+ * calculate the in-view _centre point_ and convert it into CSS pixels.
+ *
+ * Although Gecko's system internals allow click points to be
+ * given in floating point precision, the DOM operates in CSS pixels.
+ * When the in-view centre point is later used to retrieve a coordinate's
+ * paint tree, we need to ensure to operate in the same language.
+ *
+ * As a word of warning, there appears to be inconsistencies between
+ * how `DOMElement.elementsFromPoint` and `DOMWindowUtils.sendMouseEvent`
+ * internally rounds (ceils/floors) coordinates.
+ *
+ * @param {DOMRect} rect
+ * Element off a DOMRect sequence produced by calling
+ * `getClientRects` on an {@link Element}.
+ * @param {WindowProxy} win
+ * Current window global.
+ *
+ * @returns {Map.<string, number>}
+ * X and Y coordinates that denotes the in-view centre point of
+ * `rect`.
+ */
+dom.getInViewCentrePoint = function (rect, win) {
+ const { floor, max, min } = Math;
+
+ // calculate the intersection of the rect that is inside the viewport
+ let visible = {
+ left: max(0, min(rect.x, rect.x + rect.width)),
+ right: min(win.innerWidth, max(rect.x, rect.x + rect.width)),
+ top: max(0, min(rect.y, rect.y + rect.height)),
+ bottom: min(win.innerHeight, max(rect.y, rect.y + rect.height)),
+ };
+
+ // arrive at the centre point of the visible rectangle
+ let x = (visible.left + visible.right) / 2.0;
+ let y = (visible.top + visible.bottom) / 2.0;
+
+ // convert to CSS pixels, as centre point can be float
+ x = floor(x);
+ y = floor(y);
+
+ return { x, y };
+};
+
+/**
+ * Produces a pointer-interactable elements tree from a given element.
+ *
+ * The tree is defined by the paint order found at the centre point of
+ * the element's rectangle that is inside the viewport, excluding the size
+ * of any rendered scrollbars.
+ *
+ * @param {DOMElement} el
+ * Element to determine if is pointer-interactable.
+ *
+ * @returns {Array.<DOMElement>}
+ * Sequence of elements in paint order.
+ */
+dom.getPointerInteractablePaintTree = function (el) {
+ const win = el.ownerGlobal;
+ const rootNode = el.getRootNode();
+
+ // pointer-interactable elements tree, step 1
+ if (!el.isConnected) {
+ return [];
+ }
+
+ // steps 2-3
+ let rects = el.getClientRects();
+ if (!rects.length) {
+ return [];
+ }
+
+ // step 4
+ let centre = dom.getInViewCentrePoint(rects[0], win);
+
+ // step 5
+ return rootNode.elementsFromPoint(centre.x, centre.y);
+};
+
+// TODO(ato): Not implemented.
+// In fact, it's not defined in the spec.
+dom.isKeyboardInteractable = () => true;
+
+/**
+ * Attempts to scroll into view |el|.
+ *
+ * @param {DOMElement} el
+ * Element to scroll into view.
+ */
+dom.scrollIntoView = function (el) {
+ if (el.scrollIntoView) {
+ el.scrollIntoView({ block: "end", inline: "nearest" });
+ }
+};
+
+/**
+ * Ascertains whether <var>obj</var> is a DOM-, SVG-, or XUL element.
+ *
+ * @param {object} obj
+ * Object thought to be an <code>Element</code> or
+ * <code>XULElement</code>.
+ *
+ * @returns {boolean}
+ * True if <var>obj</var> is an element, false otherwise.
+ */
+dom.isElement = function (obj) {
+ return dom.isDOMElement(obj) || dom.isXULElement(obj);
+};
+
+/**
+ * Returns the shadow root of an element.
+ *
+ * @param {Element} el
+ * Element thought to have a <code>shadowRoot</code>
+ * @returns {ShadowRoot}
+ * Shadow root of the element.
+ */
+dom.getShadowRoot = function (el) {
+ const shadowRoot = el.openOrClosedShadowRoot;
+ if (!shadowRoot) {
+ throw new lazy.error.NoSuchShadowRootError();
+ }
+ return shadowRoot;
+};
+
+/**
+ * Ascertains whether <var>node</var> is a shadow root.
+ *
+ * @param {ShadowRoot} node
+ * The node that will be checked to see if it has a shadow root
+ *
+ * @returns {boolean}
+ * True if <var>node</var> is a shadow root, false otherwise.
+ */
+dom.isShadowRoot = function (node) {
+ return (
+ node &&
+ node.nodeType === DOCUMENT_FRAGMENT_NODE &&
+ node.containingShadowRoot == node
+ );
+};
+
+/**
+ * Ascertains whether <var>obj</var> is a DOM element.
+ *
+ * @param {object} obj
+ * Object to check.
+ *
+ * @returns {boolean}
+ * True if <var>obj</var> is a DOM element, false otherwise.
+ */
+dom.isDOMElement = function (obj) {
+ return obj && obj.nodeType == ELEMENT_NODE && !dom.isXULElement(obj);
+};
+
+/**
+ * Ascertains whether <var>obj</var> is a XUL element.
+ *
+ * @param {object} obj
+ * Object to check.
+ *
+ * @returns {boolean}
+ * True if <var>obj</var> is a XULElement, false otherwise.
+ */
+dom.isXULElement = function (obj) {
+ return obj && obj.nodeType === ELEMENT_NODE && obj.namespaceURI === XUL_NS;
+};
+
+/**
+ * Ascertains whether <var>node</var> is in a privileged document.
+ *
+ * @param {Node} node
+ * Node to check.
+ *
+ * @returns {boolean}
+ * True if <var>node</var> is in a privileged document,
+ * false otherwise.
+ */
+dom.isInPrivilegedDocument = function (node) {
+ return !!node?.nodePrincipal?.isSystemPrincipal;
+};
+
+/**
+ * Ascertains whether <var>obj</var> is a <code>WindowProxy</code>.
+ *
+ * @param {object} obj
+ * Object to check.
+ *
+ * @returns {boolean}
+ * True if <var>obj</var> is a DOM window.
+ */
+dom.isDOMWindow = function (obj) {
+ // TODO(ato): This should use Object.prototype.toString.call(node)
+ // but it's not clear how to write a good xpcshell test for that,
+ // seeing as we stub out a WindowProxy.
+ return (
+ typeof obj == "object" &&
+ obj !== null &&
+ typeof obj.toString == "function" &&
+ obj.toString() == "[object Window]" &&
+ obj.self === obj
+ );
+};
+
+const boolEls = {
+ audio: ["autoplay", "controls", "loop", "muted"],
+ button: ["autofocus", "disabled", "formnovalidate"],
+ details: ["open"],
+ dialog: ["open"],
+ fieldset: ["disabled"],
+ form: ["novalidate"],
+ iframe: ["allowfullscreen"],
+ img: ["ismap"],
+ input: [
+ "autofocus",
+ "checked",
+ "disabled",
+ "formnovalidate",
+ "multiple",
+ "readonly",
+ "required",
+ ],
+ keygen: ["autofocus", "disabled"],
+ menuitem: ["checked", "default", "disabled"],
+ ol: ["reversed"],
+ optgroup: ["disabled"],
+ option: ["disabled", "selected"],
+ script: ["async", "defer"],
+ select: ["autofocus", "disabled", "multiple", "required"],
+ textarea: ["autofocus", "disabled", "readonly", "required"],
+ track: ["default"],
+ video: ["autoplay", "controls", "loop", "muted"],
+};
+
+/**
+ * Tests if the attribute is a boolean attribute on element.
+ *
+ * @param {Element} el
+ * Element to test if <var>attr</var> is a boolean attribute on.
+ * @param {string} attr
+ * Attribute to test is a boolean attribute.
+ *
+ * @returns {boolean}
+ * True if the attribute is boolean, false otherwise.
+ */
+dom.isBooleanAttribute = function (el, attr) {
+ if (!dom.isDOMElement(el)) {
+ return false;
+ }
+
+ // global boolean attributes that apply to all HTML elements,
+ // except for custom elements
+ const customElement = !el.localName.includes("-");
+ if ((attr == "hidden" || attr == "itemscope") && customElement) {
+ return true;
+ }
+
+ if (!boolEls.hasOwnProperty(el.localName)) {
+ return false;
+ }
+ return boolEls[el.localName].includes(attr);
+};