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  <title>Matrix multiplication 2×2</title>
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  <h1>2×2 product</h1>
  <p>Edit <code>a</code> / <code>b</code>, then <strong>Run</strong>.</p>
  <pre id=out></pre>
  <script>!function(){function n(n,o,t){var u;for(n.push(o),u=0;u<2;u++)n.push(t[u].join(" ")+" ")}var o=[[1,2],[3,4]],t=[[5,6],[7,8]],u=function(n,o){var t,u,r,e=[];for(t=0;t<2;t++)for(e[t]=[],u=0;u<2;u++)for(e[t][u]=0,r=0;r<2;r++)e[t][u]+=n[t][r]*o[r][u];return e}(o,t),r=[];n(r,"A",o),r.push(""),n(r,"B",t),r.push(""),n(r,"AB",u),document.getElementById("out").textContent=r.join("\n")}()</script>
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JavaScript Matrix Multiplication — 2×2 (Try It)