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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" />
<title>24. CSS Best Practices</title>
<style>
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
font-family: 'Poppins', sans-serif;
background-color: #1cc9be;
padding: 20px;
}
.section {
background: rgba(255, 255, 255, 0.3);
padding: 20px;
border-radius: 15px;
max-width: 1000px;
margin: auto;
box-shadow: 0 8px 16px rgba(0,0,0,0.2);
}
h2, h3 { color: #349; margin-bottom: 15px; }
p {
font-size: 18px;
margin-bottom: 15px;
line-height: 1.6;
}
textarea, iframe {
width: 100%;
height: 160px;
font-size: 16px;
padding: 10px;
margin: 10px 0 20px;
border-radius: 10px;
border: 2px solid white;
background: rgba(255,248,240,0.4);
font-family: monospace;
}
button {
background: #007bff;
color: #fff;
border: none;
padding: 8px 20px;
font-size: 15px;
font-weight: 500;
border-radius: 8px;
cursor: pointer;
margin-bottom: 20px;
transition: all 0.3s ease-in-out;
position: relative;
overflow: hidden;
}
button::before {
content: '';
position: absolute;
top: 0; left: -100%;
width: 100%; height: 100%;
background: linear-gradient(120deg, #00bcd4, #2196f3);
transition: all 0.4s ease;
z-index: -1;
}
button:hover::before { left: 0; }
button:hover {
color: #fff;
box-shadow: 0 4px 10px rgba(0,0,0,0.2);
transform: translateY(-1px);
}
button:active {
transform: scale(0.95);
box-shadow: none;
}
</style>
</head>
<body>
<div class="section">
<h2>24. CSS Best Practices</h2>
<h3>I. Organizing CSS Code</h3>
<p><strong>Explanation:</strong> CSS ko section-wise (layout, typography, buttons, etc.) divide karna readability aur maintainability ke liye acha hota hai.</p>
<textarea id="code1">
/* Layout */
.container {
max-width: 1200px;
margin: auto;
}
/* Typography */
h1 {
font-size: 32px;
}
/* Buttons */
.btn {
background: blue;
color: white;
}
</textarea>
<button onclick="runCode('code1', 'output1')">Run Code</button>
<iframe id="output1"></iframe>
<h3>II. Writing Maintainable CSS</h3>
<p><strong>Explanation:</strong> Reusable classes banana aur comments lagana future updates ke liye helpful hota hai. Har component ka styling alag hona chahiye.</p>
<textarea id="code2">
/* Reusable Button */
.btn {
padding: 10px 20px;
border-radius: 5px;
}
.btn-primary {
background-color: green;
color: white;
}
</textarea>
<button onclick="runCode('code2', 'output2')">Run Code</button>
<iframe id="output2"></iframe>
<h3>III. Use of BEM (Block Element Modifier)</h3>
<p><strong>Explanation:</strong> BEM ek naming convention hai jisse CSS classes ko logically aur consistently manage kiya jata hai. Jaise: <code>.card__title--large</code></p>
<textarea id="code3">
<div class="card">
<h2 class="card__title card__title--large">Product</h2>
</div>
<style>
.card { border: 1px solid #333; padding: 10px; }
.card__title { font-weight: bold; }
.card__title--large { font-size: 24px; }
</style>
</textarea>
<button onclick="runCode('code3', 'output3')">Run Code</button>
<iframe id="output3"></iframe>
<h3>IV. Code Minification</h3>
<p><strong>Explanation:</strong> Production ke liye CSS ko minify karna (white space & comments hata kar) page speed improve karta hai. Ye manually ya tools se ho sakta hai jaise <code>cssnano</code>, <code>PostCSS</code>, etc.</p>
<textarea id="code4">
/* Before Minification */
body {
background-color: white;
color: black;
}
/* After Minification */
body{background-color:white;color:black}
</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>