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Contents
/* global dom */
/* eslint complexity: ["error", 20] */
/**
* Determines if an element is hidden with the clip rect technique
* @method isClipped
* @memberof axe.commons.dom
* @private
* @param {String} clip Computed property value of clip
* @return {Boolean}
*/
function isClipped(clip) {
'use strict';
var matches = clip.match(
/rect\s*\(([0-9]+)px,?\s*([0-9]+)px,?\s*([0-9]+)px,?\s*([0-9]+)px\s*\)/
);
if (matches && matches.length === 5) {
return matches[3] - matches[1] <= 0 && matches[2] - matches[4] <= 0;
}
return false;
}
/**
* Determine whether an element is visible
* @method isVisible
* @memberof axe.commons.dom
* @instance
* @param {HTMLElement} el The HTMLElement
* @param {Boolean} screenReader When provided, will evaluate visibility from the perspective of a screen reader
* @param {Boolean} recursed
* @return {Boolean} The element's visibilty status
*/
dom.isVisible = function(el, screenReader, recursed) {
//eslint complexity: 13
'use strict';
var style, nodeName, parent;
// 9 === Node.DOCUMENT
if (el.nodeType === 9) {
return true;
}
// 11 === Node.DOCUMENT_FRAGMENT_NODE
if (el.nodeType === 11) {
el = el.host; // grab the host Node
}
style = window.getComputedStyle(el, null);
if (style === null) {
return false;
}
nodeName = el.nodeName.toUpperCase();
if (
style.getPropertyValue('display') === 'none' ||
['STYLE', 'SCRIPT', 'NOSCRIPT', 'TEMPLATE'].includes(nodeName) ||
(!screenReader && isClipped(style.getPropertyValue('clip'))) ||
(!recursed &&
// visibility is only accurate on the first element
(style.getPropertyValue('visibility') === 'hidden' ||
// position does not matter if it was already calculated
(!screenReader && dom.isOffscreen(el)))) ||
(screenReader && el.getAttribute('aria-hidden') === 'true')
) {
return false;
}
parent = el.assignedSlot ? el.assignedSlot : el.parentNode;
if (parent) {
return dom.isVisible(parent, screenReader, true);
}
return false;
};
Version data entries
104 entries across 104 versions & 1 rubygems