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1. What is web?

Web is one of the most popular applications running on internet. Internet provides us with an environment for web to run. We commonly call it a web page, and the career point is the World wide Web (the World wide Web has the World wide Web Alliance is an organization that is W3C.

The role of web: web can connect various types of information and services and provide a graphical user interface for generation.

How 2.web works

Web is a program based on the pattern of the Bhammer S structure and the pattern of the Cmax S structure. (B:Browser browser C:Client client S:Server server) communicates with the user agent and the Web server.

Web server

Action

①: stores content information on web pages and provides a management environment

② processes requests from browsers and executes server-side programs that can respond.

③ has basic security features

Main products: Tomcat IIS Apache …

Web browser

Action

① proxy user submit request

② as the HTML CSS JS interpreter

③ displays content graphically

Main products:

Microsoft internet Explorer (IE browser)

Google Chrome Google browser

Mozilla fireFox Firefox browser

Opera Openg browser

Apple safari Apple browser

Technologies related to 3.web

① server-side technology: the main operation and server technology operation database

JSP PHP ASP .NET

② client technology: run on the client, and the browser is responsible for interpreting and running

HTML CSS JS

1, what HTML?

① HTML Hypertext markup language

② hypertext: text with special functions

③ tags: tags regulate the composition of hypertext

④ hyperlink pictures, audio and video.

⑤ language: with specific syntax specifications

⑥ HTML is the design language of web pages, files written by HTML

The general suffix is. Html,htm .

Development tools of 2.HTML

① development tools: notepad, super notepad, Hbuilder, etc.

② operating tool: various browsers

The basic syntax of 3.HTML

1, tag syntax

① in HTML, the symbols used to describe functions are called tags, which must be enclosed in the process of use.

The classification of ② markers. Enclose the tagged content of a class

b. The tag of an unclosed class is also known as an empty tag single tag or

2, attributes and values

The ① attribute is used to modify the element (tag)

Example

Run

In the middle of this page.

② Standard Properties

a. Also known as an attribute that all tags on a common properties page will have

Unique identification of b.id page elements

C.class class name

D.style defines the style of an element

The content displayed by moving the mouse over the element

③ comments:

Comments are not interpreted and executed by the browser

Usage:

Note: comments cannot be nested comments only recognize that the beginning and end comments cannot be in the tag

III. HTML document structure

1. First line: type declaration of the document

Purpose: specify the version and type of the document

Indicates that this file is a version of HTML5

Head: the header of the web page: the role defines the global information in the page

Specify the character set of the document

The title of the document

IV. Special characters

1 in html, any number of spaces and carriage returns are finally parsed into a single space

Express the special effect through the special expression of the escape character

① & nbsp; spaces ② & lt

④ & yen; ¥⑤ & copy;?

Thickening

Italic

Underline

Delete Lin

Superscript

Subscript

Function: display text in the form of a title

Mode of expression:

1. Vertical blank distance

two。 Different title font sizes vary in range: 1-6 cannot exceed this range from large to small.

3. Monopolize a line

Function: to represent a separate piece of text on a page

Mode of expression: with vertical white space to occupy one line

Function: line break

Purpose: display lines on the page

Attribute: size of size Dimension

Width: width

Align: horizontal alignment of lines

Color: color

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