Differential D2604 Diff 9314 swh/web/assets/src/bundles/vendors/elementsfrompoint-polyfill.js

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				/**
				* Copyright (C) 2020 The Software Heritage developers
				* See the AUTHORS file at the top-level directory of this distribution
				* License: GNU Affero General Public License version 3, or any later version
				* See top-level LICENSE file for more information
				*/

				/**
				* Some old browsers (Safari 11.0, Firefox 36.0) do not support
				* document.elementsFromPoint, only document.elementFromPoint.
				* https://developer.mozilla.org/en-US/docs/Web/API/DocumentOrShadowRoot/elementsFromPoint
				* Polyfill is based on https://github.com/JSmith01/elementsfrompoint-polyfill (public domain)
				* and fix a bug in that implementation
				*/

				if (typeof document !== 'undefined' && typeof document.elementsFromPoint === 'undefined') {
				document.elementsFromPoint = elementsFromPointPolyfill;
				}

				function elementsFromPointPolyfill(x, y) {
				var elements = [];
				var pointerEvents = [];
				var el;

				do {
				var parent = document.elementFromPoint(x, y);
				if (parent) {
				el = parent;
				elements.push(el);
				pointerEvents.push(el.style.pointerEvents);
				el.style.pointerEvents = 'none';
				} else {
				el = null;
				}
				} while (el);

				for (var i = 0; i < elements.length; i++) {
				elements[i].style.pointerEvents = pointerEvents[i];
				}

				return elements;
				}