How to correctly choose inline and block-level elements: learn to use them appropriately according to your needs-CSS Tutorial-php.cn

How to correctly choose inline and block-level elements: learn to use them appropriately according to your needs

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Release： 2023-12-23 13:37:04

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How to correctly choose inline and block-level elements: learn to use them appropriately according to your needs

How to correctly choose inline elements and block-level elements: Learn to use them appropriately according to your needs, specific code examples are required

As a front-end developer, choose the correct inline elements and blocks Level elements are crucial to building the layout of a web page. Different element types have different characteristics and uses, so certain principles need to be followed when selecting and using them reasonably. This article explains how to correctly select between inline and block-level elements, and provides specific code examples.

1. What are inline elements and block-level elements
Inline elements and block-level elements are two common element types in HTML and CSS.

Inline element (inline element): Inline element means that it only occupies the space required by the content of the element when rendering, and does not occupy a single line. Common inline elements include a, span, img, input, etc.

Block-level element (block element): A block-level element occupies an exclusive line when rendering and will wrap automatically. Common block-level elements include div, p, h1-h6, ul, li, etc.

2. How to choose inline elements and block-level elements

Reasonable selection based on the semantics of the elements
When building a web page layout, you first need to select appropriate tags based on the semantics of the elements. . Semantics refers to the structural and semantic meaning and role of tags. For example, when building article content, you can use the block-level element p as a wrapper for a paragraph, and the inline element a as a link mark.
Choose block-level elements when you need to occupy one or more rows
If you need an element to occupy one line by itself, or if you need to break a line before or after the element, you should select block-level elements. For example, when building a navigation bar, use the div element as a container. The div element is a block-level element by default, allowing the navigation bar element to occupy its own row.
Select inline elements when displaying inline is required
If you need elements to be displayed in one line and do not require forced line breaks, then you should select inline elements. For example, when building a button, you can use an a element or a span element as the mark of the button to display the button in one line.
Select based on the default style of the element
There are some differences in the default style between inline elements and block-level elements. The default style of block-level elements usually generates top and bottom spacing to separate them from surrounding elements; while the default style of inline elements does not generate top and bottom spacing. Therefore, when selecting an element type, you can also choose based on the element's style properties.

3. Specific code examples

Use block-level elements to build page layout

<!DOCTYPE html>
<html>
<head>
  <title>块级元素示例</title>
</head>
<body>
  <div>
    <h1>这是一个标题</h1>
    <p>这是一个段落。</p>
    <ul>
      <li>列表项1</li>
      <li>列表项2</li>
      <li>列表项3</li>
    </ul>
  </div>
</body>
</html>

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In the above code, use the block-level element div As a container for the page layout, h1 is used as the title tag, p is used as the paragraph tag, ul and li are used as the unordered list tags, these elements will occupy an exclusive line and will wrap automatically.

Use inline elements to build link buttons

<!DOCTYPE html>
<html>
<head>
  <title>行内元素示例</title>
  <style>
    .button {
      padding: 10px 20px;
      background-color: #52a3f0;
      color: #fff;
      text-decoration: none;
      border-radius: 4px;
    }
  </style>
</head>
<body>
  <p>点击 <a class="button" href="#">这里</a> 查看更多信息。</p>
</body>
</html>

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In the above code, the inline element a is used as the mark of the button, and the style and spacing of the button are adjusted through CSS styles , so that the button can be displayed in one line and will not wrap automatically.

Through the above examples, we can see that the choice of inline elements and block-level elements needs to be decided based on specific needs and semantics. The correct selection of element types not only helps the page layout to have a clear structure, but also improves user experience and development efficiency. I hope this article has inspired readers when choosing between inline and block-level elements.

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