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How to view and debug HTML web pages in a browser

PHPzOriginal: 2023-04-24 14:49:172179browse

HTML (Hyper Text Markup Language) is a standard language for creating web pages and is the basis of web design. This article will introduce the basic syntax and common tags of HTML, as well as how to view and debug HTML web pages in the browser. 1. Basic syntax of HTML HTML uses tags to describe the elements of the page. Tags are enclosed in angle brackets, for example:

<p>这是一个段落。</p>

where  is the paragraph tag and  is the closing tag . The start tag tells the browser to start a new element, and the end tag tells the browser to end the current element. Some tags only have a start tag but no end tag, for example:

<br>

This is a line break tag, used to insert a newline character in the text. HTML documents must contain the following basic structure:

<!DOCTYPE html>
<html>
  <head>
    <title>页面标题</title>
  </head>
  <body>
    页面内容
  </body>
</html>

Among them, <!DOCTYPE html> is a document type declaration, telling the browser that this is an HTML5 document. The <html> tag is the root element of the document and contains the structure of the entire page. <head>The tag is the header, which contains some metadata and the title of the page. <title>The tag is the title of the page and is displayed on the browser's tab bar. The <body> tag is the main body of the page and contains all page content. 2. Common HTML tags The following are commonly used tags in HTML and their usage: <ol>

Title tag: used to define the title of the web page. There are 6 levels, represented by <h1> to <h6>, where <h1> is the highest level title.

<h1>这是一级标题</h1>
<h2>这是二级标题</h2>
<h3>这是三级标题</h3>
<h4>这是四级标题</h4>
<h5>这是五级标题</h5>
<h6>这是六级标题</h6>

Paragraph tag: used to define text paragraphs.

<p>这是一个段落。</p>

Link tag: used to define hyperlinks to guide users from the current web page to other web pages.

<a href="http://www.baidu.com">百度一下，你就知道</a>

Among them, href is the URL pointed to by the link, that is, the address of the target web page.

Image tag: used to insert images into web pages.

<img src="picture.jpg" alt="图片">

Among them, src is the URL of the image, that is, the address of the image; alt is the alternative text of the image. When the image cannot be displayed, the alt text will be displayed instead of the image.

List tag: used to define ordered and unordered lists.

<ul>
  <li>无序列表项1</li>
  <li>无序列表项2</li>
</ul>

<ol>
  <li>有序列表项1</li>
  <li>有序列表项2</li>
</ol>

Among them, <ul> and <ol> are the tags of the unordered list and the ordered list respectively, < li> is the label of the list item.

Table tag: used to define the table.

<table>
  <tr>
    <th>姓名</th>
    <th>年龄</th>
    <th>性别</th>
  </tr>
  <tr>
    <td>张三</td>
    <td>20</td>
    <td>男</td>
  </tr>
  <tr>
    <td>李四</td>
    <td>25</td>
    <td>女</td>
  </tr>
</table>

Among them, <table> is the label of the table, <tr> is the label of the table row, <th> is the label of the table header cell, <td> is the label of the table data cell. 3. View and debug HTML web pages in the browser You can use any text editor (such as Notepad, Sublime Text, Visual Studio Code, etc.) to write HTML documents. After saving the document, name it with the extension .html or .htm, and you can open it in the browser. It is recommended to use modern browsers such as Google Chrome or Mozilla Firefox to view and debug HTML web pages. Press the F12 key in the browser to open the developer tools, where you can debug and modify web pages through element inspection, console and other functions. To sum up, HTML is the basis for web page production. Learning HTML well is crucial for web page production and website development. Mastering the basic syntax and common tags of HTML, as well as debugging skills in the browser, will help improve the efficiency and quality of web design and development.

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