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CSS style is presentation. It's like a Web jacket. For example, the title font, color changes, or add background images, borders, etc. to the title. All of these things that are used to change the appearance of content are called presentations.

JavaScript is used to implement special effects on web pages. For example: mouse over pop-up drop-down menu. Or mouse over the table background color changes. There is also rotation of news focus (news pictures). It can be understood that animation and interaction are generally implemented in JavaScript.

Fixed structure of HTML

An HTML file has its own fixed structure.

…

…

Code explanation:

Called the root tag, all web tags are in the middle.

The tag is used to define the header of the document, which is the container for all header elements.

The header elements have labels such as,,,, etc. The header labels are described in detail in the next section.

The content between and tags is the main content of the web page, such as,

、、

Web content tags, etc., where the content in the tag will be displayed in the browser.

2. The role of labels

The header of the document describes various attributes and information of the document, including the title of the document. Most document headers contain data that is not actually displayed to the reader as content.

The following tags can be used in the head section:

…

…

…

3. Labels

The text between and tags is the title information of the page, which appears in the title bar of the browser. The title tag of a web page is used. Webpage creation learning exchange group, 49406, 4934.

In order to tell users and search engines what the main content of this page is, search engines can quickly determine the topic of the page by the title of the page. The content of each page is different, and each page should have a unique

A title without two.

For example:

hello world

The content of the tag "hello world" appears in the title bar of the browser,

4. Use of labels

When we learn how to make web pages, we often hear a word, semantically. So what is called semantic, said the popular point is: understand the purpose of each tag (under what circumstances it is reasonable to use this tag), for example, the title of the article on the web page can use the title tag, the column name of each column on the web page can also use the title tag.

The text of the passage must be placed in the paragraph tag. If there is text that you want to emphasize in the passage, you can make

Use em labels for emphasis, etc.

So much for semantics, but what benefits can semantics bring us?

It is easier to be included in search engines.

②。Make it easier for screen readers to read web content.

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Time limit! Free Dreamweaver, js and other front-end tutorials

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HTML Examples

Rookie tutorial (runoob.com) My first title

My first paragraph.

Introduction to HTML

Case analysis

DOCTYPE declares document types

Located in tags with descriptions of document types

Located in tabs with content for visualization pages

Located on label with use as a title

the label

with

displayed as a paragraph

Introduction to HTML

What is HTML?

HTML is a language used to describe web pages.

HTML stands for Hypertext Markup Language.

HTML is not a programming language, but a markup language.

A markup language is a set of markup tags.

HTML uses markup tags to describe web pages

HTML documents contain HTML tags and text content

HTML documents are also called web pages.

Introduction to HTML

HTML tags

HTML tags are often referred to as HTML tags.

HTML tags are keywords surrounded by angle brackets, such as

HTML tags usually appear in pairs, such as and

The first label in a label pair is the start label and the second label is the end label

Start and end labels are also known as open labels and closed labels

content

HTML elements

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

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

HTML elements:

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.

Browsers do not display HTML tags directly, but tags can be used to determine how the content of HTML pages is presented to users:

Introduction to HTML

HTML page structure

Here is a visual HTML page structure:

page title

This is a title.

This is a paragraph.

This is another paragraph.

Introduction to HTML

HTML version

Since the early days of the Web, there have been many versions of HTML:

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

Declarations help to display web pages correctly in browsers.

There are many different files on the web, and if you can declare the HTML version correctly, the browser will display the content correctly.

doctype declaration is case-insensitive and can be used in the following ways:

general statement

HTML5

HTML 4.01

XHTML 1.0

View full page Statement Type DOCTYPE Reference Manual.

Introduction to HTML

Chinese code

At present, in most browsers, direct output of Chinese will result in Chinese garbled characters. In this case, we need to declare the characters as UTF-8 in the header.

HTML Examples

Page Title My First Title

My first paragraph.

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Hypertext Markup Language (HTML) is a markup language used to make web pages, which does not need to be compiled and can be interpreted and executed directly by browsers. More vividly, HTML is the "native language" of browsers. HTML is mainly responsible for information presentation in web page design, independent of various operating system platforms, and can inform browsers to display content. HTML has been used as the Internet's information presentation language since the 1990s to describe the formatting of web pages and link information to other web pages on the Internet.

HTML Introduction

With respect to hypertext markup language, it has the following meanings:

Hyper: Relative to linear. Previous computer programs ran essentially linearly, that is, when a computer program finished executing a command, it moved to the next line, and when that line ended, it moved down, and so on. HTML, however, is different; it can jump anywhere at any time. For example, a program can jump from line 1 to line 8, then to line 5, or even to another program to execute.

Text: The word itself, meaning it is self-explanatory.

Markup: refers to how text is processed. Text is marked in a manner similar to bolding text in a text editing program, or making a line of text a title or list item.

Language: HTML is a language that uses many English words.

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