css-series/03-CSS Selectors & Specificity.html at main · jdcodebase/css-series · GitHub

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>CSS Selectors & Specificity – JDCodebase</title>

    <style>
      /* ---------------------------
       BASIC SELECTORS
    ----------------------------*/
      p {
        color: red;
      }

      .info {
        color: blue;
      }

      #box {
        background: black;
        color: white;
        padding: 10px;
      }

      /* Universal Selector */
      * {
        font-family: Arial, Helvetica, sans-serif;
      }

      /* Grouping Selector */
      h1,
      h2 {
        color: green;
      }

      /* Descendant Selector */
      .container p {
        color: purple;
      }

      /* Child Selector */
      .container > p {
        color: orange;
        font-weight: bold;
      }

      /* Sibling Selectors */
      h3 + p {
        color: brown;
      }

      h3 ~ p {
        background: #e6e6e6;
      }

      /* Attribute Selector */
      input[type="text"] {
        border: 2px solid blue;
        padding: 5px;
      }

      a[target="_blank"] {
        color: green;
      }

      /* Pseudo Classes */
      a:hover {
        color: red;
      }

      input:focus {
        border: 2px solid green;
        outline: none;
      }

      li:first-child {
        color: blue;
      }

      li:last-child {
        color: darkorange;
      }

      /* ---------------------------
       SPECIFICITY EXAMPLE
    ----------------------------*/
      p {
        color: red;
      }

      .parent p {
        color: blue;
      }

      #special p {
        color: green;
      }

      /* !important Example */
      .important-text {
        color: purple !important;
      }
    </style>
  </head>

  <body>
    <h1>CSS Selectors & Specificity</h1>
    <h2>JDCodebase Web Development Series</h2>

    <hr />

    <!-- BASIC SELECTORS -->
    <h2>Basic Selectors</h2>
    <p>This is a normal paragraph (element selector)</p>
    <p class="info">This paragraph uses a class selector</p>
    <div id="box">This div uses an ID selector</div>

    <hr />

    <!-- DESCENDANT & CHILD -->
    <h2>Descendant & Child Selectors</h2>

    <div class="container">
      <p>Direct child paragraph</p>

      <section>
        <p>Nested paragraph (descendant)</p>
      </section>
    </div>

    <p>Outside paragraph</p>

    <hr />

    <!-- SIBLINGS -->
    <h2>Sibling Selectors</h2>
    <h3>Heading 3</h3>
    <p>Adjacent sibling paragraph</p>
    <p>General sibling paragraph</p>

    <hr />

    <!-- ATTRIBUTE SELECTORS -->
    <h2>Attribute Selectors</h2>

    <input type="text" placeholder="Type here..." />
    <br /><br />
    <a href="#" target="_blank">Open in new tab</a>

    <hr />

    <!-- PSEUDO CLASSES -->
    <h2>Pseudo Class Selectors</h2>

    <a href="#">Hover on this link</a>
    <br /><br />

    <input type="text" placeholder="Click to focus" />

    <ul>
      <li>First Item</li>
      <li>Middle Item</li>
      <li>Last Item</li>
    </ul>

    <hr />

    <!-- SPECIFICITY -->
    <h2>Specificity Example</h2>

    <div class="parent">
      <div id="special">
        <p>This paragraph is affected by multiple selectors</p>
      </div>
    </div>

    <p class="important-text">This text uses !important</p>

    <hr />

    <h2>End of Demo</h2>
    <p>Practice and experiment to understand better!</p>
  </body>
</html>