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HTML element

Popularity：244 ℃/2024-08-05 18:37:24

You already have a good understanding of the basic concepts of HTML elements.An HTML document is made up of a series of HTML elements that are defined by tags, each with a start tag and an end tag (except for empty elements). I will continue to add and emphasize some key points below.

The basic structure of an HTML element

The basic structure of an HTML element consists of a start tag, element content, and an end tag. Example:

</p> This is a paragraph. </p>
  • Start tab：<p>It tells the browser that this is the beginning of a paragraph.
  • Element content: The text between the tags, i.e. "This is a paragraph." .
  • closing tag：</p>, which tells the browser that the content of the paragraph has ended.

empty element

Empty elements are those that do not contain any content and they are closed in the start tag. Common empty elements include:

  • <br>: Line breaks.
  • <img>: Image.
  • <input>: Input box.
  • <hr>: Horizontal dividers.

While HTML allows some empty elements (such as the<br>) does not use a closing slash (/), but in XHTML and HTML5, it is recommended to use the self-closing form (e.g.<br />) to improve code portability and future compatibility.

nested element

HTML elements can be nested, i.e. one element can contain another. This allows you to create complex page structures. For example:

<div>.
  <p> This is a paragraph. </p>
  <ul>
    <li> List item 1 </li>
    <li>list item 2</li>
  </ul>
</div>

In this example, the<div>element contains the<p>element and a<ul>Elements.<ul>element in turn contains the<li>Elements.

HTML attributes

HTML elements can contain attributes that provide additional information about the element. Attributes always appear as name/value pairs and are placed in the start tag. Example:

<a href=""> Visit Example</a>

Here.<a>element has ahrefattribute with a value of. This tells the browser which URL to jump to when the user clicks on the link.

caveat

  • closing tag: Although some browsers can tolerate missing closing tags, it's best to always include them to avoid potential layout problems or compatibility issues.
  • capitals and lower case letters: HTML tags are case insensitive, but the W3C recommends the use of lowercase tags to improve code readability and consistency.
  • causality: In HTML5, many attributes have default values, but specifying them explicitly improves code readability and maintainability.

By following these basic guidelines and best practices, you can write HTML code that is clear, valid, and easy to maintain.

This article was written by Learning Together Posted!

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