Loopcode/4css.html at main · Dharmandra-singh/Loopcode · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
<!-- Google tag (gtag.js) -->
<script async src="https://www.googletagmanager.com/gtag/js?id=G-D0ENCWPZL9"></script>
<script>
  window.dataLayer = window.dataLayer || [];
  function gtag(){dataLayer.push(arguments);}
  gtag('js', new Date());

  gtag('config', 'G-D0ENCWPZL9');
</script>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
  <title>4. CSS Units</title>
  <style>
    body {
      font-family: 'Poppins', sans-serif;
      background: #1cc9be;
      padding: 20px;
      color: #222;
    }
    .section {
      background: rgba(255, 255, 255, 0.3);
      padding: 20px;
      margin-bottom: 30px;
      border-radius: 12px;
      box-shadow: 0 0 10px rgba(0,0,0,0.3);
    }
    h2, h3 {
      color: #113;
      margin-bottom: 10px;
    }
    p {
      font-size: 17px;
      margin-bottom: 15px;
      line-height: 1.8;
    }
    textarea, iframe {
      width: 100%;
      border-radius: 10px;
      margin-bottom: 20px;
      border: 2px solid white;
    }
    textarea {
  width: 100%;
  max-width: 100%;
  height: 180px;
  font-family: monospace;
  font-size: 16px;
  padding: 12px;
  border: 2px solid white;
  border-radius: 10px;
  background: rgba(255,248,240,0.4);
  resize: vertical;
  box-sizing: border-box;
  overflow: auto;
}
    iframe {
      height: 180px;
      background: rgba(255,248,240,0.3);
    }
    button {
      padding: 10px 20px;
      border: none;
      background: #28a745;
      color: white;
      border-radius: 8px;
      font-weight: bold;
      cursor: pointer;
    }
  </style>
</head>
<body>

<div class="section">
  <h2>4. CSS Units</h2>
  <p><strong>Explanation:</strong> Jab bhi hum kisi element ko size, margin, padding, ya font-size dete hain CSS mein, to humein UNIT lagani padti hai. Jaise 10px, 50%, 2em, 100vw, etc. Unit batata hai ki value ka scale kya hoga.</p>
</div>

<div class="section">
  <h3>I. Absolute Units</h3>
  <p><strong>Definition:</strong> Ye fixed hote hain, screen ya parent size se nahi badalte. Har jagah same dikhte hain.</p>
  <ul>
    <li><strong>px (pixels):</strong> Sabse commonly used unit. Ek pixel = screen ka ek point.</li>
    <li><strong>cm (centimeter), mm (millimeter), in (inch):</strong> Real world units — print media mein use hote hain.</li>
  </ul>
  <p><strong>Use:</strong> Jab hume exact control chahiye layout par, jaise border, box size, buttons, etc.</p>

  <textarea id="code1">
<!DOCTYPE html>
<html>
<body>
  <div style="width: 200px; height: 100px; background: #ffdd57;">
    200px wide box
  </div>
</body>
</html>
  </textarea>
  <button onclick="runCode('code1', 'output1')">Run Code</button>
  <iframe id="output1"></iframe>
</div>

<div class="section">
  <h3>II. Relative Units</h3>
  <p><strong>Definition:</strong> Ye apne parent element ya default font size ke basis par kaam karte hain.</p>
  <ul>
    <li><strong>% (percentage):</strong> Parent element ke size ka percentage.</li>
    <li><strong>em:</strong> Current element ke font-size ke base par (1em = current font size).</li>
    <li><strong>rem (root em):</strong> Root element (HTML tag) ke font-size ke base par.</li>
  </ul>
  <p><strong>Use:</strong> Responsive design ke liye best — screen ke size ke hisaab se adjust hota hai.</p>

  <textarea id="code2">
<!DOCTYPE html>
<html>
<head>
  <style>
    .parent {
      width: 100%;
      background: #fff;
    }
    .child {
      width: 50%;
      background: #2196f3;
      font-size: 2em; /* 2x current size */
    }
  </style>
</head>
<body>
  <div class="parent">
    <div class="child">50% Width + 2em Font</div>
  </div>
</body>
</html>
  </textarea>
  <button onclick="runCode('code2', 'output2')">Run Code</button>
  <iframe id="output2"></iframe>
</div>

<div class="section">
  <h3>III. Viewport Units</h3>
  <p><strong>Definition:</strong> Ye screen ke viewport (visible area) ke hisaab se size dete hain. Super useful in responsive layout.</p>
  <ul>
    <li><strong>vw (viewport width):</strong> 1vw = 1% of browser width</li>
    <li><strong>vh (viewport height):</strong> 1vh = 1% of browser height</li>
    <li><strong>vmin, vmax:</strong> Minimum ya maximum of vw and vh</li>
  </ul>
  <p><strong>Use:</strong> Full screen layouts, banners, headers banane ke liye perfect.</p>

  <textarea id="code3">
<!DOCTYPE html>
<html>
<head>
  <style>
    .box {
      width: 100vw;
      height: 30vh;
      background: #673ab7;
      color: white;
      display: flex;
      justify-content: center;
      align-items: center;
    }
  </style>
</head>
<body>
  <div class="box">30% of screen height</div>
</body>
</html>
  </textarea>
  <button onclick="runCode('code3', 'output3')">Run Code</button>
  <iframe id="output3"></iframe>
</div>

<script>
function runCode(textareaId, iframeId) {
  var code = document.getElementById(textareaId).value;
  var iframe = document.getElementById(iframeId);
  iframe.contentDocument.open();
  iframe.contentDocument.write(code);
  iframe.contentDocument.close();
}
</script>

</body>
</html>