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  <title>JS Alphabet Pattern 1 - Try It (Browser)</title>
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  <h1>Alphabet Pattern (Browser Demo)</h1>
  <p>This demo uses <code>document.write</code> and <code>&lt;br&gt;</code>. Edit the loops, then click Run.</p>
  <script>for(let r=65;r<=69;r++){for(let e=65;e<=r;e++)document.write(String.fromCharCode(e));document.write("<br>")}</script>
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JavaScript Alphabet Pattern 1 (Try It — Browser)