| 1 |
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| 2 | (function (window) { 'use strict';
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| 3 |
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| 4 | if (!('firstElementChild' in window.DocumentFragment.prototype)) {
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| 5 | Object.defineProperty(window.DocumentFragment.prototype, 'firstElementChild', {
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| 6 | get: function () {
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| 7 | var node, nodes = this.childNodes, i = 0;
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| 8 | while (node = nodes[i++]) {
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| 9 | if (node.nodeType === 1) {
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| 10 | return node;
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| 11 | }
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| 12 | }
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| 13 | return null;
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| 14 | }
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| 15 | });
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| 16 | }
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| 17 |
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| 18 | if (!('children' in window.DocumentFragment.prototype)) {
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| 19 | Object.defineProperty(window.DocumentFragment.prototype, 'children', {
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| 20 | get: function () {
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| 21 | var i = 0, node, nodes = this.childNodes, children = [];
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| 22 | while (node = nodes[i++]) {
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| 23 | if (node.nodeType === 1) {
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| 24 | children.push(node);
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| 25 | }
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| 26 | }
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| 27 | return children;
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| 28 | }
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| 29 | });
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| 30 | }
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| 31 |
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| 32 | if (!('lastElementChild' in window.DocumentFragment.prototype)) {
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| 33 | Object.defineProperty(window.DocumentFragment.prototype, 'lastElementChild', {
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| 34 | get: function () {
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| 35 | var node, nodes = this.childNodes, i = nodes.length - 1;
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| 36 | while (node = nodes[i--]) {
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| 37 | if (node.nodeType === 1) {
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| 38 | return node;
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| 39 | }
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| 40 | }
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| 41 | return null;
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| 42 | }
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| 43 | });
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| 44 | }
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| 45 |
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| 46 | if (!('childElementCount' in window.DocumentFragment.prototype)) {
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| 47 | Object.defineProperty(window.DocumentFragment.prototype, 'childElementCount', {
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| 48 | get: function () {
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| 49 | var i = 0, count = 0, node, nodes = this.childNodes;
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| 50 | while (node = nodes[i++]) {
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| 51 | if (node.nodeType === 1) count++;
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| 52 | }
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| 53 | return count;
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| 54 | }
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| 55 | });
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| 56 | }
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| 57 |
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| 58 | })(window);
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