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  <title>Matrix multiplication 3×3</title>
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  <h1>Multiply two 3×3 matrices</h1>
  <p>Edit arrays, then <strong>Run</strong>.</p>
  <pre id=out></pre>
  <script>!function(){function t(t,r,o){var n,u,f;for(t.push(r),n=0;n<3;n++){for(f="",u=0;u<3;u++)f+=o[n][u]+"\t";t.push(f)}}var r=[[1,2,3],[4,5,6],[7,8,9]],o=[[9,8,7],[6,5,4],[3,2,1]],n=function(t,r){var o,n,u,f=[];for(o=0;o<3;o++)for(f[o]=[],n=0;n<3;n++)f[o][n]=0;for(o=0;o<3;o++)for(n=0;n<3;n++)for(u=0;u<3;u++)f[o][n]+=t[o][u]*r[u][n];return f}(r,o),u=[];t(u,"First Matrix:",r),u.push(""),t(u,"Second Matrix:",o),u.push(""),t(u,"Result Matrix:",n),document.getElementById("out").textContent=u.join("\n")}()</script>
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JavaScript Matrix Multiplication — 3×3 (Try It)