22css.html

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  <title>22. CSS for Accessibility</title>
  <style>
    * { margin: 0; padding: 0; box-sizing: border-box; }
    body {
      font-family: 'Poppins', sans-serif;
      background: #1cc9be;
      color: #222;
    }
    .section {
      background: rgba(255, 255, 255, 0.3);
      padding: 20px;
      margin: 25px auto;
      border-radius: 12px;
      max-width: 1000px;
      box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
    }
    h2, h3 { color: #333; margin-bottom: 15px; }
    p {
      font-size: 18px;
      margin-bottom: 20px;
      line-height: 1.7;
    }
    textarea {
      width: 100%;
      height: 180px;
      font-family: 'Courier New', monospace;
      font-size: 16px;
      padding: 14px;
      background: #fff;
      border: 2px solid #ccc;
      border-radius: 10px;
      margin-bottom: 12px;
      resize: vertical;
    }
    button {
      background: linear-gradient(135deg, #00c6ff, #0072ff);
      color: white;
      padding: 8px 18px;
      font-size: 15px;
      border: none;
      border-radius: 30px;
      cursor: pointer;
      margin-bottom: 15px;
    }
    iframe {
      width: 100%;
      height: 160px;
      border: 2px solid white;
      border-radius: 10px;
      background: #fff;
    }
  </style>
</head>
<body>
  <div class="section">
    <h2>22. CSS for Accessibility</h2>

    <h3>I. Color Contrast and Legibility</h3>
    <p><strong>Explanation:</strong> Text aur background ke beech clear contrast hona chahiye taaki users, especially low-vision waale, text easily padh sakein. <br><strong>Kyon important hai:</strong> Agar contrast low hoga to text mushkil se dikhega ya bilkul nahi dikhega — isliye high contrast zaroori hai.</p>
    <textarea id="code1">
<style>
  .good {
    background-color: black;
    color: white;
    padding: 20px;
    font-size: 18px;
  }
</style>

<div class="good">High contrast text for better readability</div>
    </textarea>
    <button onclick="runCode('code1', 'output1')">Run Code</button>
    <iframe id="output1"></iframe>

    <h3>II. Accessible Font Sizes</h3>
    <p><strong>Explanation:</strong> Accessible websites me font sizes relative units (jaise <code>rem</code>) me hone chahiye taaki zoom karne par scale ho sake. <br><strong>Kyon important hai:</strong> Fixed px size se low-vision users ko dikkat hoti hai. `rem` use karne se font screen settings ke according adjust ho jata hai.</p>
    <textarea id="code2">
<style>
  body {
    font-size: 1rem;
  }
  h1 {
    font-size: 2rem;
  }
</style>

<h1>Scalable Font Example</h1>
    </textarea>
    <button onclick="runCode('code2', 'output2')">Run Code</button>
    <iframe id="output2"></iframe>

    <h3>III. Focus States</h3>
    <p><strong>Explanation:</strong> Keyboard se navigate karne wale users ke liye focus state dikhana zaroori hota hai. <br><strong>Kyon important hai:</strong> Focus outline batata hai ki abhi user kis element pe hai. Agar ye missing ho, to keyboard users confuse ho jaate hain.</p>
    <textarea id="code3">
<style>
  button:focus {
    outline: 3px solid orange;
    outline-offset: 4px;
  }
</style>

<button>Click or Tab to Focus</button>
    </textarea>
    <button onclick="runCode('code3', 'output3')">Run Code</button>
    <iframe id="output3"></iframe>

    <h3>IV. ARIA Roles & Attributes</h3>
    <p><strong>Explanation:</strong> ARIA roles aur attributes screen readers ko help karte hain element ka function samajhne me. <br><strong>Kyon important hai:</strong> Visual users ko dikhta hai ki kya hai, lekin screen reader ke users ko ye ARIA batata hai ki nav menu, button ya dialog kya kaam karta hai.</p>
    <textarea id="code4">
<nav role="navigation" aria-label="Main Menu">
  <ul>
    <li><a href="#">Home</a></li>
    <li><a href="#">About</a></li>
  </ul>
</nav>

<button aria-label="Close Menu">&times;</button>
    </textarea>
    <button onclick="runCode('code4', 'output4')">Run Code</button>
    <iframe id="output4"></iframe>
  </div>

  <script>
    function runCode(textareaId, iframeId) {
      const code = document.getElementById(textareaId).value;
      const iframe = document.getElementById(iframeId);
      const doc = iframe.contentDocument || iframe.contentWindow.document;
      doc.open();
      doc.write(code);
      doc.close();
    }
  </script>
</body>
</html>