HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

  <meta name=viewport content="width=device-width,initial-scale=1">

  <title>Dynamic dir</title>

  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155;line-height:1.7}h1{margin:0 0 .75rem;font-size:1.25rem;color:#0f172a}p{margin:0 0 1rem;padding:.75rem 1rem;background:#fff;border:1px solid #e2e8f0;border-radius:8px;max-width:520px}.controls{display:flex;gap:.5rem;flex-wrap:wrap}button{font:inherit;padding:.35rem .75rem;border:1px solid #cbd5e1;border-radius:6px;background:#fff;cursor:pointer}button.is-active{background:#2563eb;color:#fff;border-color:#2563eb}</style>

</head>

<body>

  <h1>Toggle text direction</h1>

  <p id=dynamicElement>مرحبًا! اضغط زرًا لتغيير اتجاه النص.</p>

  <div class=controls>

    <button type=button id=btnLtr>LTR</button>

    <button type=button id=btnRtl class=is-active>RTL</button>

  </div>

  <script>var element=document.getElementById("dynamicElement"),btnLtr=document.getElementById("btnLtr"),btnRtl=document.getElementById("btnRtl");function setDir(t,e){element.dir=t,btnLtr.classList.toggle("is-active",e===btnLtr),btnRtl.classList.toggle("is-active",e===btnRtl)}btnLtr.addEventListener("click",(function(){setDir("ltr",btnLtr)})),btnRtl.addEventListener("click",(function(){setDir("rtl",btnRtl)}))</script>

</body>

</html>

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HTML dir Attribute — Toggle with JavaScript