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  <title>JS Number Pattern 40 - Try It</title>
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  <h1>Alternating 1 and 0 (Decreasing Length)</h1>
  <p>Edit <code>size</code> and click Run.</p>
  <pre id=output></pre>
  <script>const size=5;let result="";for(let t=1;t<=5;t++){let e="";const l=t%2==0?"0":"1";for(let n=t;n<=5;n++)e+=l;result+=e+"\n"}document.getElementById("output").textContent=result</script>
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JavaScript Number Pattern 40 (Try It)