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Getting started with the HTML+CSS basics of Web front-end development (using CSS styles)

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Author: User
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1) html<! Doctype> Declaration Label

A. Definitions and usage

<! The doctype> declaration must be the first line in the HTML document, before the

<! The doctype> declaration is not an HTML tag; it is a directive that instructs the Web browser to write which HTML version of the page to use.

In HTML 4.01, <! The doctype> declaration references a DTD because HTML 4.01 is based on SGML. The DTD prescribes the rules of the markup language so that the browser renders the content correctly.

HTML5 is not based on SGML, so you do not need to reference a DTD.

B. Version declarations

HTML5:

<! Doctypehtml>

<metacharset= "Utf-8" >

HTML 4.01:

  <!DOCTYPEHTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"

"Http://www.w3.org/TR/html4/loose.dtd" >

The DTD contains all the HTML elements and attributes, including both display and deprecated elements (such as font). Frameset (framesets) is not allowed.

<meta http-equiv=content-typecontent= "Text/html;charset=utf-8" >

Rules of attention:

  单标记必须闭合比如<br>必须写为<br />  <input />

Single attribute must add attribute value: <input typr= "Radio" checked > must be written as <input typr= "Radio" checked= "checked"/>

tags and attributes must use lowercase:<body><body> is wrong must be written as <body>

The property value of the property must use "": You can use <body before HTML4.01 bgcolor=red>,html4.01 must be written as <bodybgcolor= "Red" >

2) CSS Cascading style sheets

Inline style sheet: <bodystyle= "background-color:green; margin:0; padding:0; " ></body>

Embedded style sheet: <style type= "Text/css" ></STYLE> you need to put the style in

Introduction style sheet: <link rel= "StyleSheet" type= "Text/css" href= "Style.css" >

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Getting started with the HTML+CSS basics of Web front-end development (using CSS styles)

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