1 | (function() {
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2 | var DEFAULT_VIEWPORT = 'width=device-width,initial-scale=1,maximum-scale=1,minimum-scale=1,user-scalable=no';
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3 |
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4 | var Viewport = {
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5 | ensureViewportElement: function() {
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6 | var viewportElement = document.querySelector('meta[name=viewport]');
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7 |
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8 | if (!viewportElement) {
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9 | viewportElement = document.createElement('meta');
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10 | viewportElement.name = 'viewport';
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11 | document.head.appendChild(viewportElement);
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12 | }
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13 |
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14 | return viewportElement;
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15 | },
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16 |
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17 | setup: function() {
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18 | var viewportElement = Viewport.ensureViewportElement();
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19 |
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20 | if (!viewportElement) {
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21 | return;
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22 | }
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23 |
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24 | if (!viewportElement.hasAttribute('content')) {
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25 | viewportElement.setAttribute('content', DEFAULT_VIEWPORT);
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26 | }
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27 | }
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28 | };
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29 |
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30 | window.Viewport = Viewport;
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31 | })();
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