Dynamic rendering of math equations support

  • Any idea how to achieve this by CSS or script in nodebb ACP?

    link :https://www.tuhh.de/MathJax/test/sample-dynamic.html

    you can easily check the source code of it, here I copy it in below

    <!DOCTYPE html>
    <title>MathJax Dynamic Math Test Page</title>
    <!-- Copyright (c) 2010-2015 The MathJax Consortium -->
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <script type="text/javascript" src="../MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>
    input {margin-top: .7em}
    .output {
      border: 1px solid black;
      padding: 1em;
      width: auto;
      position: absolute; top: 0; left: 2em;
      min-width: 20em;
    .box {position: relative}
      //  Use a closure to hide the local variables from the
      //  global namespace
      (function () {
        var QUEUE = MathJax.Hub.queue;  // shorthand for the queue
        var math = null, box = null;    // the element jax for the math output, and the box it's in
        //  Hide and show the box (so it doesn't flicker as much)
        var HIDEBOX = function () {box.style.visibility = "hidden"}
        var SHOWBOX = function () {box.style.visibility = "visible"}
        //  Get the element jax when MathJax has produced it.
        QUEUE.Push(function () {
          math = MathJax.Hub.getAllJax("MathOutput")[0];
          box = document.getElementById("box");
          SHOWBOX(); // box is initially hidden so the braces don't show
        //  The onchange event handler that typesets the math entered
        //  by the user.  Hide the box, then typeset, then show it again
        //  so we don't see a flash as the math is cleared and replaced.
        window.UpdateMath = function (TeX) {
    Type some \(\rm\TeX\) code and press RETURN:<br /> 
    <input id="MathInput" size="80" onchange="UpdateMath(this.value)" />
    <p>You typed:</p>
    <div class="box" id="box" style="visibility:hidden">
    <div id="MathOutput" class="output">$${}$$</div>
      //  IE doesn't fire onchange events for RETURN, so
      //   use onkeypress to do a blur (and refocus) to
      //   force the onchange to occur
      if (MathJax.Hub.Browser.isMSIE) {
        MathInput.onkeypress = function () {
          if (window.event && window.event.keyCode === 13) {this.blur(); this.focus()}

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