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Quelle DOM.sys.mjs
Sprache: unbekannt
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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 {Record<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><input type=checkbox></tt>,
* <tt><input type=radio></tt>,
* and <tt>>option></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><input></code> or <code><textarea></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;
}
// Selenium expects that even an enabled "option" element that is a child
// of a disabled "optgroup" or "select" element to be disabled.
if (["optgroup", "option"].includes(el.localName) && !el.disabled) {
const parent = dom.findClosest(el, "optgroup,select");
return dom.isDisabled(parent);
}
return el.matches(":disabled");
};
/**
* Denotes elements that can be used for typing and clearing.
*
* Elements that are considered WebDriver-editable are non-readonly
* and non-disabled <code><input></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><textarea></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><textarea></code> element.
*
* <li>It is an <code><input></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 {Record<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><option></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><datalist></tt> or <tt><select></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;
let originalStyleAttrValue = el.getAttribute("style");
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;
if (originalStyleAttrValue === null) {
el.removeAttribute("style");
} else if (el.getAttribute("style") != originalStyleAttrValue) {
el.setAttribute("style", originalStyleAttrValue);
}
}
};
/**
* 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);
};
dom.isEnabled = function (el) {
let enabled = false;
if (el.ownerDocument.contentType !== "text/xml") {
enabled = !dom.isDisabled(el);
}
return enabled;
};
/**
* 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);
};
[ Dauer der Verarbeitung: 0.9 Sekunden
(vorverarbeitet)
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2026-03-28
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