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  <title>Matrix addition 3×3</title>
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  <h1>Add two 3×3 matrices</h1>
  <p>Edit the arrays, then <strong>Run</strong>.</p>
  <pre id=out></pre>
  <script>!function(){function t(t,n){var u;for(u=0;u<n.length;u++)t.push(n[u].join(" ")+" ")}var n=[[1,2,3],[4,5,6],[7,8,9]],u=[[9,8,7],[6,5,4],[3,2,1]],e=function(t,n){var u,e,o=t.length,r=t[0].length,h=[];for(u=0;u<o;u++)for(h[u]=[],e=0;e<r;e++)h[u][e]=t[u][e]+n[u][e];return h}(n,u),o=[];o.push("Matrix 1:"),t(o,n),o.push(""),o.push("Matrix 2:"),t(o,u),o.push(""),o.push("Resultant Matrix:"),t(o,e),document.getElementById("out").textContent=o.join("\n")}()</script>
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JavaScript Matrix Addition — 3×3 (Try It)