Introduction to learning HTML

What is HTML?

HTML is a language used to describe web pages.

• HTML refers to Hypertext Markup Language: Hyper Text M arkup Language

• 
  

• ## HTML is not a programming language, but a

  markuplanguage

• 
  

• The markup language is a set of

  markup tags (markup tag)

• 
  

## HTML uses markup tags to
• describe

  web pages

• 
  

The HTML document contains HTML

• tags and textcontent

• 
  

  ##
HTML document
• also called

  web page

HTML tag

---

HTML markup tags are often called HTML tags.

HTML tags are keywords surrounded by

angle brackets
• , such as

• 
  # HTML tags usually

  appear in pairs, such as and
• ## The first tag in the tag pair is

  start tag
  , and the second tag is

  end tag
• The opening and closing tags are also known as

  opening tags
  and

  closing tags

• Content

---

HTML elements

"HTML tag" and "HTML element" usually describe the same meaning.

But strictly speaking, an HTML element contains a start tag and an end tag, as in the following example:

HTML element:

This is a paragraph.

---

Web browser

Web browsers (such as Google Chrome, Internet Explorer, Firefox, Safari) are used to read HTML files and display them as web pages.

The browser does not directly display the HTML tag, but it can use the tag to determine how to display the content of the HTML page to the user:

---

HTML web page results

The following is a visual HTML page structure:

This a heading

This is a paragraph.

This is another paragraph.

---

HTML version

Since the birth of the early web, many versions of HTML have appeared:

Version	release time
HTML	1991
HTML+	1993
HTML 2.0	1995
HTML 3.2	1997
HTML 4.01	1999
XHTML 1.0	2000
HTML5	2012
# XHTML5	2013

#

---

Statement

The declaration helps browsers display web pages correctly.

There are many different files on the Internet. If the HTML version can be declared correctly, the browser can display the web page content correctly.

---

Joint Statement

HTML5

HTML 4.01

a href="http://www.php.cn/wiki/1550.html" target="_blank">W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">

XHTML 1.0

br/> "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

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