What are the characteristics of sticky positioning?-HTML Tutorial-php.cn

What are the characteristics of sticky positioning?

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Release： 2024-02-19 12:37:22

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What are the characteristics of sticky positioning?

The characteristic of sticky positioning is a common page layout method, which allows an element to remain fixed at a specific position on the page when scrolling and is not affected by the scrolling action. This layout is very useful in implementing navigation menus and maintaining the visibility of fixed elements on the page. The following will introduce the characteristics of sticky positioning and specific code examples.

The characteristics of sticky positioning mainly include the following points:

The element always stays at the specified position: no matter how the page scrolls, the sticky positioned element will be fixed at the specified position, regardless of Will move or disappear with scrolling.
Behavior related to positioned elements: Sticky positioned elements are positioned relative to their parent elements or a reference point in the document, so their behavior will be affected by these elements.
Has the feature of automatic cancellation: when scrolling to the specified position or beyond a certain range, the sticky positioning element will automatically cancel the sticky positioning, that is, return to the normal layout.

The following is a specific sticky positioning code example to achieve a fixed effect of a navigation menu.

HTML code:

<!DOCTYPE html>
<html>
<head>
  <title>粘性定位代码示例</title>
  <style>
    body {
      margin: 0;
    }

    header {
      height: 50px;
      background: #f0f0f0;
    }

    nav {
      position: sticky;
      top: 0;
      background: #fff;
    }

    nav ul {
      margin: 0;
      padding: 0;
      list-style: none;
      display: flex;
    }

    nav li {
      margin-right: 10px;
    }

    main {
      height: 2000px;
      padding-top: 50px;
    }
  </style>
</head>
<body>
  <header>
    <nav>
      <ul>
        <li><a href="#">菜单1</a></li>
        <li><a href="#">菜单2</a></li>
        <li><a href="#">菜单3</a></li>
        <li><a href="#">菜单4</a></li>
      </ul>
    </nav>
  </header>
  <main>
    <!-- 页面内容 -->
  </main>
</body>
</html>

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In the above code, use position: sticky; to set sticky positioning, top: 0; means navigation The menu is fixed at the top of the page. nav ul and nav li are used to set the menu style.

In actual use, the characteristics of sticky positioning can be used to implement more complex layouts, such as fixed return to top buttons, toolbars hovering at the edge of the screen, etc.

To sum up, the characteristic of sticky positioning is that the element remains fixed at a specific position on the page when scrolling, and has the characteristics of staying, being related to the positioned element and automatically canceling. By rationally using sticky positioning, we can achieve a more flexible and attractive page layout effect.

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