XHTML introductory learning tutorial: simple web page production_HTML/Xhtml_web page production

Make your first web page in one minute:
Let’s try to make a simple web page. We hope you can follow us. It will only take you a minute. Now you may not know what those angle brackets "" and the letters inside are, don't worry, we will introduce it to you in the following tutorial.
First run Notepad, or create a new text document anywhere, and enter the following content in Notepad:
The following is the quoted content:

This is my first web page.

After completing the input, save the file and name it "index.html". (Click "File" -> "Save As". Fill in "index.html" in the "File Name" column, select "All Files" in the "Save Type" column, and then click the "Save Button")
After saving, double-click the file and the browser will automatically open the webpage. Please confirm whether your web page is the same as this page. If it is the same, then you have successfully completed your first relatively simple web page.
Please note that this is just a simple page. Although it syntactically conforms to the XHTML standard, it lacks some content if it is to be used as a complete, W3C-compliant XHTML web page. Relevant content will be introduced in subsequent tutorials. This page is just for explaining some basic XHTML knowledge.
Basic knowledge explanation
The web page we just created begins with and ends with , which represent the beginning and end of the web page file respectively.
In English, head means head and body means body. The two parts of the web page, and , represent the "head" and "body" of the web page respectively. Maybe you noticed that there is a in the "header" of our webpage. The word title means title, and the title of the webpage (title) will be displayed in the title bar above the browser. And the webpage The body, that is, the content between the and tags will be displayed in the browser as the body text.
This webpage is very thin, with little content in the head and body. We will gradually enrich the content of the web page in future tutorials. But now please remember a concept: the head of the web page is written for the browser, which will not be displayed on the page, while the body (body) is written for the users of the website, and is what the browser will display. content.
Examples of errors in XHTML spoofing by rookies
Open the two error examples below and take a look. Their code contains very serious errors, but the browser will display these two pages accurately.
Example 1 - The body grows in the head

This is my first webpage .

Look at the web page above. The content between and is displayed normally on the page. But that was a comical mistake, putting the body in the head.
Example 2 - The head grows under the neck

This is my first web page.

The browser’s adaptability is really impressive, it can recognize you even if you put your head inside your body. Look at the title bar, the title is displayed completely normally.
Okay, please don’t make the above stupid mistakes when applying it in practice. This will have serious consequences: search engines may not index your website; friends who use mobile phones or other mobile devices to browse your website may encounter unknown errors. Let's quickly get into the core content of XHTML.