/* 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/. * Adapted from: https://github.com/fred-wang/mathml.css */ (function () {  window.addEventListener("load", function() {    var box, div, link, namespaceURI;    // First check whether the page contains any <math> element.    namespaceURI = "http://www.w3.org/1998/Math/MathML";    // Create a div to test mspace, using Kuma's "offscreen" CSS    document.body.insertAdjacentHTML("afterbegin", "<div style='border: 0; clip: rect(0 0 0 0); height: 1px; margin: -1px; overflow: hidden; padding: 0; position: absolute; width: 1px;'><math xmlns='" + namespaceURI + "'><mspace height='23px' width='77px'></mspace></math></div>");    div = document.body.firstChild;    box = div.firstChild.firstChild.getBoundingClientRect();    document.body.removeChild(div);    if (Math.abs(box.height - 23) > 1  || Math.abs(box.width - 77) > 1) {      window.supportsMathML = false;    }  });}());