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toggle-steps.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="x-ua-compatible" content="ie=edge">
<meta name="viewport" content="width=device-width">
<title>MathJax v3 dynamic equations using toggle</title>
<script src="https://polyfill.io/v3/polyfill.min.js?features=es6"></script>
<script>
MathJax = {
tex: {inlineMath: [['$', '$'], ['\\(', '\\)']]},
chtml: {
displayAlign: 'left'
},
startup: {
pageReady: function () {
//
// Do the usual startup (which does a typeset).
// When that is all done, un-hide the page.
//
return MathJax.startup.defaultPageReady().then(function () {
document.getElementById("hidden").disabled = true;
});
}
}
};
</script>
<script id="MathJax-script" async src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-chtml.js"></script>
<style>
h1 {
background: #CCCCCC;
padding: .2em 1em;
border-top: 3px solid #666666;
border-bottom: 3px solid #999999;
}
#frame {
margin-left: 2em;
}
</style>
<style id="hidden">
body {
visibility: hidden;
}
</style>
</head>
<body>
<h1>Dynamic Equations in MathJax</h1>
<div id="frame">
<p>
Expand the following:
$$
\require{action}
\def\longest{x(x+1) + 1(x+1)}
\def\click{\rlap{\enclose{roundedbox}{\small\text{next step}}}\hphantom{\longest}}
\def\={\phantom{{}={}}}
(x+1)^2
\toggle
{\begin{aligned}[t]& = \click\end{aligned}}
{\begin{aligned}[t]& = (x+1)(x+1)\\[3px]&\=\click\end{aligned}}
{\begin{aligned}[t]& = (x+1)(x+1)\\[3px]& = x(x+1) + 1(x+1)\\&\=\click\end{aligned}}
{\begin{aligned}[t]& = (x+1)(x+1)\\[3px]& = x(x+1) + 1(x+1)\\[3px]& = (x^2+x) + (x+1)\\[3px]&\=\click\end{aligned}}
{\begin{aligned}[t]& = (x+1)(x+1)\\[3px]& = x(x+1) + 1(x+1)\\[3px]& = (x^2+x) + (x+1)\\[3px]& = x^2 + (x + x) + 1\\[3px]&\=\click\end{aligned}}
{\begin{aligned}[t]& = (x+1)(x+1)\\[3px]& = x(x+1) + 1(x+1)\\[3px]& = (x^2+x) + (x+1)\\[3px]& = x^2 + (x + x) + 1\\[3px]& = x^2 + 2x + 1\end{aligned}}
\endtoggle
$$
</p>
</frame>
</body>
</html>