목차
1. 레이아웃
 2.HTML 响应式 Web 设计
3.框架
4.内联框架
5.背景
6.头部
7.文档类型
웹 프론트엔드 HTML 튜토리얼 HTML을 처음부터 시작하기(2 2016/9/20)

HTML을 처음부터 시작하기(2 2016/9/20)

Sep 21, 2016 pm 01:56 PM

1. 레이아웃

① <div> 요소를 사용한 HTML 레이아웃 <div> 요소는 CSS를 통해 쉽게 배치할 수 있으므로 레이아웃 도구로 자주 사용됩니다.

<span style="color: #0000ff;">&lt;!</span><span style="color: #ff00ff;">DOCTYPE html</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">html</span><span style="color: #0000ff;">&gt;</span>

<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">head</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">style</span><span style="color: #0000ff;">&gt;</span><span style="background-color: #f5f5f5; color: #800000;">
#header </span><span style="background-color: #f5f5f5; color: #000000;">{</span><span style="background-color: #f5f5f5; color: #ff0000;">
    background-color</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">black</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #ff0000;">
    color</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">white</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #ff0000;">
    text-align</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">center</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #ff0000;">
    padding</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">5px</span><span style="background-color: #f5f5f5; color: #000000;">;</span>
<span style="background-color: #f5f5f5; color: #000000;">}</span><span style="background-color: #f5f5f5; color: #800000;">
把div理解成一个盒子,设置了盒子的高和宽,后面的盒子就自动跑到前面盒子没占的地方
#nav </span><span style="background-color: #f5f5f5; color: #000000;">{</span><span style="background-color: #f5f5f5; color: #ff0000;">
    line-height</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">30px</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #ff0000;">
    background-color</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">#eeeeee</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #ff0000;">
    height</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">300px</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #ff0000;">       
    width</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">100px</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #ff0000;">
    float</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">left</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #ff0000;">
    padding</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">5px</span><span style="background-color: #f5f5f5; color: #000000;">;</span>          
<span style="background-color: #f5f5f5; color: #000000;">}</span><span style="background-color: #f5f5f5; color: #800000;">
#section </span><span style="background-color: #f5f5f5; color: #000000;">{</span><span style="background-color: #f5f5f5; color: #ff0000;">
    width</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">350px</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #ff0000;">
    float</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">left</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #ff0000;">
    padding</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">10px</span><span style="background-color: #f5f5f5; color: #000000;">;</span>          
<span style="background-color: #f5f5f5; color: #000000;">}</span><span style="background-color: #f5f5f5; color: #800000;">
#footer </span><span style="background-color: #f5f5f5; color: #000000;">{</span><span style="background-color: #f5f5f5; color: #ff0000;">
    background-color</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">black</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #ff0000;">
    color</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">white</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #ff0000;">
    clear</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">both</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #ff0000;">        清除前面float(浮动)的影响
    text-align</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">center</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #ff0000;">
   padding</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">5px</span><span style="background-color: #f5f5f5; color: #000000;">;</span>          
<span style="background-color: #f5f5f5; color: #000000;">}</span>
<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">style</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">head</span><span style="color: #0000ff;">&gt;</span>

<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">body</span><span style="color: #0000ff;">&gt;</span>

<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">div </span><span style="color: #ff0000;">id</span><span style="color: #0000ff;">="header"</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">h1</span><span style="color: #0000ff;">&gt;</span>City Gallery<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">h1</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">div</span><span style="color: #0000ff;">&gt;</span>

<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">div </span><span style="color: #ff0000;">id</span><span style="color: #0000ff;">="nav"</span><span style="color: #0000ff;">&gt;</span><span style="color: #000000;">
London</span><span style="color: #0000ff;">&lt;</span><span style="color: #800000;">br</span><span style="color: #0000ff;">&gt;</span><span style="color: #000000;">
Paris</span><span style="color: #0000ff;">&lt;</span><span style="color: #800000;">br</span><span style="color: #0000ff;">&gt;</span><span style="color: #000000;">
Tokyo</span><span style="color: #0000ff;">&lt;</span><span style="color: #800000;">br</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">div</span><span style="color: #0000ff;">&gt;</span>

<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">div </span><span style="color: #ff0000;">id</span><span style="color: #0000ff;">="section"</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">h2</span><span style="color: #0000ff;">&gt;</span>London<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">h2</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">p</span><span style="color: #0000ff;">&gt;</span><span style="color: #000000;">
London is the capital city of England. It is the most populous city in the United Kingdom,
with a metropolitan area of over 13 million inhabitants.
</span><span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">p</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">p</span><span style="color: #0000ff;">&gt;</span><span style="color: #000000;">
Standing on the River Thames, London has been a major settlement for two millennia,
its history going back to its founding by the Romans, who named it Londinium.
</span><span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">p</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">div</span><span style="color: #0000ff;">&gt;</span>

<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">div </span><span style="color: #ff0000;">id</span><span style="color: #0000ff;">="footer"</span><span style="color: #0000ff;">&gt;</span><span style="color: #000000;">
Copyright ? W3Schools.com
</span><span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">div</span><span style="color: #0000ff;">&gt;</span>

<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">body</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">html</span><span style="color: #0000ff;">&gt;</span>
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② HTML5를 이용한 웹사이트 레이아웃

HTML5는 웹페이지의 다양한 부분을 정의하는 새로운 의미 요소를 제공합니다.

HTML5 의미 요소:

header 定义文档或节的页眉
nav 定义导航链接的容器
section 定义文档中的节
article 定义独立的自包含文章
aside 定义内容之外的内容(比如侧栏)
footer 定义文档或节的页脚
details 定义额外的细节
summary 定义 details 元素的标题

 

 

<span style="color: #0000ff;">&lt;!</span><span style="color: #ff00ff;">DOCTYPE html</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">html</span><span style="color: #0000ff;">&gt;</span>

<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">head</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">style</span><span style="color: #0000ff;">&gt;</span><span style="background-color: #f5f5f5; color: #800000;">
header </span><span style="background-color: #f5f5f5; color: #000000;">{</span><span style="background-color: #f5f5f5; color: #ff0000;">
    background-color</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">black</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #ff0000;">
    color</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">white</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #ff0000;">
    text-align</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">center</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #ff0000;">
    padding</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">5px</span><span style="background-color: #f5f5f5; color: #000000;">;</span>     
<span style="background-color: #f5f5f5; color: #000000;">}</span><span style="background-color: #f5f5f5; color: #800000;">
nav </span><span style="background-color: #f5f5f5; color: #000000;">{</span><span style="background-color: #f5f5f5; color: #ff0000;">
    line-height</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">30px</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #ff0000;">
    background-color</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">#eeeeee</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #ff0000;">
    height</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">300px</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #ff0000;">
    width</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">100px</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #ff0000;">
    float</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">left</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #ff0000;">
    padding</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">5px</span><span style="background-color: #f5f5f5; color: #000000;">;</span>          
<span style="background-color: #f5f5f5; color: #000000;">}</span><span style="background-color: #f5f5f5; color: #800000;">
section </span><span style="background-color: #f5f5f5; color: #000000;">{</span><span style="background-color: #f5f5f5; color: #ff0000;">
    width</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">350px</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #ff0000;">
    float</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">left</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #ff0000;">
    padding</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">10px</span><span style="background-color: #f5f5f5; color: #000000;">;</span>          
<span style="background-color: #f5f5f5; color: #000000;">}</span><span style="background-color: #f5f5f5; color: #800000;">
footer </span><span style="background-color: #f5f5f5; color: #000000;">{</span><span style="background-color: #f5f5f5; color: #ff0000;">
    background-color</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">black</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #ff0000;">
    color</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">white</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #ff0000;">
    clear</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">both</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #ff0000;">
    text-align</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">center</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #ff0000;">
    padding</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">5px</span><span style="background-color: #f5f5f5; color: #000000;">;</span>          
<span style="background-color: #f5f5f5; color: #000000;">}</span>
<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">style</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">head</span><span style="color: #0000ff;">&gt;</span>

<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">body</span><span style="color: #0000ff;">&gt;</span>

<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">header</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">h1</span><span style="color: #0000ff;">&gt;</span>City Gallery<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">h1</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">header</span><span style="color: #0000ff;">&gt;</span>

<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">nav</span><span style="color: #0000ff;">&gt;</span><span style="color: #000000;">
London</span><span style="color: #0000ff;">&lt;</span><span style="color: #800000;">br</span><span style="color: #0000ff;">&gt;</span><span style="color: #000000;">
Paris</span><span style="color: #0000ff;">&lt;</span><span style="color: #800000;">br</span><span style="color: #0000ff;">&gt;</span><span style="color: #000000;">
Tokyo</span><span style="color: #0000ff;">&lt;</span><span style="color: #800000;">br</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">nav</span><span style="color: #0000ff;">&gt;</span>

<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">section</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">h1</span><span style="color: #0000ff;">&gt;</span>London<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">h1</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">p</span><span style="color: #0000ff;">&gt;</span><span style="color: #000000;">
London is the capital city of England. It is the most populous city in the United Kingdom,
with a metropolitan area of over 13 million inhabitants.
</span><span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">p</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">p</span><span style="color: #0000ff;">&gt;</span><span style="color: #000000;">
Standing on the River Thames, London has been a major settlement for two millennia,
its history going back to its founding by the Romans, who named it Londinium.
</span><span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">p</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">section</span><span style="color: #0000ff;">&gt;</span>

<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">footer</span><span style="color: #0000ff;">&gt;</span><span style="color: #000000;">
Copyright W3Schools.com
</span><span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">footer</span><span style="color: #0000ff;">&gt;</span>

<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">body</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">html</span><span style="color: #0000ff;">&gt;</span>
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③ 使用表格的 HTML 布局 。<table> 元素不是作为布局工具而设计的,<table> 元素的作用是显示表格化的数据,使用 <table> 元素能够取得布局效果,因为能够通过 CSS 设置表格元素的样式

 

复习表格:下面代码所定义的是一个一行一列的表格,<th>是这一行的表头,<td>是这一行的内容,<tr>定义了这一行。

 

<span style="color: #0000ff;">&lt;!</span><span style="color: #ff00ff;">DOCTYPE html</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">html</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">head</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">style</span><span style="color: #0000ff;">&gt;</span><span style="background-color: #f5f5f5; color: #800000;">
table.lamp </span><span style="background-color: #f5f5f5; color: #000000;">{</span><span style="background-color: #f5f5f5; color: #ff0000;">
    width</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">100%</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #ff0000;">
    border</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">1px solid #d4d4d4</span><span style="background-color: #f5f5f5; color: #000000;">;</span>
<span style="background-color: #f5f5f5; color: #000000;">}</span><span style="background-color: #f5f5f5; color: #800000;">
table.lamp th, td </span><span style="background-color: #f5f5f5; color: #000000;">{</span><span style="background-color: #f5f5f5; color: #ff0000;"> 
    padding</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">10px</span><span style="background-color: #f5f5f5; color: #000000;">;</span>
<span style="background-color: #f5f5f5; color: #000000;">}</span><span style="background-color: #f5f5f5; color: #800000;">
table.lamp th </span><span style="background-color: #f5f5f5; color: #000000;">{</span><span style="background-color: #f5f5f5; color: #ff0000;">
    width</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;">40px</span><span style="background-color: #f5f5f5; color: #000000;">;</span>
<span style="background-color: #f5f5f5; color: #000000;">}</span>

<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">style</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">head</span><span style="color: #0000ff;">&gt;</span>

<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">body</span><span style="color: #0000ff;">&gt;</span>
 
<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">table </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="lamp"</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">tr</span><span style="color: #0000ff;">&gt;</span>
  <span style="color: #0000ff;">&lt;</span><span style="color: #800000;">th</span><span style="color: #0000ff;">&gt;</span>
    <span style="color: #0000ff;">&lt;</span><span style="color: #800000;">img </span><span style="color: #ff0000;">src</span><span style="color: #0000ff;">="/images/lamp1.jpg"</span><span style="color: #ff0000;"> alt</span><span style="color: #0000ff;">="Note"</span><span style="color: #ff0000;"> style</span><span style="color: #0000ff;">="height:32px;width:32px"</span><span style="color: #0000ff;">&gt;</span>
  <span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">th</span><span style="color: #0000ff;">&gt;</span>
  <span style="color: #0000ff;">&lt;</span><span style="color: #800000;">td</span><span style="color: #0000ff;">&gt;</span><span style="color: #000000;">
    The table element was not designed to be a layout tool.
  </span><span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">td</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">tr</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">table</span><span style="color: #0000ff;">&gt;</span>

<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">body</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">html</span><span style="color: #0000ff;">&gt;</span>
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 2.HTML 响应式 Web 设计

  • RWD 指的是响应式 Web 设计(Responsive Web Design)
  • RWD 能够以可变尺寸传递网页
  • RWD 对于平板和移动设备是必需的

① 创建响应式设计的一个方法,是自己来创建它:

<span style="color: #0000ff;">&lt;!</span><span style="color: #ff00ff;">DOCTYPE html</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">html </span><span style="color: #ff0000;">lang</span><span style="color: #0000ff;">="en-US"</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">head</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">style</span><span style="color: #0000ff;">&gt;</span><span style="background-color: #f5f5f5; color: #800000;">
.city </span><span style="background-color: #f5f5f5; color: #000000;">{</span><span style="background-color: #f5f5f5; color: #ff0000;">
float</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> left</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #ff0000;">
margin</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 5px</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #ff0000;">
padding</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 15px</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #ff0000;">
width</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 300px</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #ff0000;">
height</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 300px</span><span style="background-color: #f5f5f5; color: #000000;">;</span><span style="background-color: #f5f5f5; color: #ff0000;">
border</span><span style="background-color: #f5f5f5; color: #000000;">:</span><span style="background-color: #f5f5f5; color: #0000ff;"> 1px solid black</span><span style="background-color: #f5f5f5; color: #000000;">;</span>
<span style="background-color: #f5f5f5; color: #000000;">}</span> 
<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">style</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">head</span><span style="color: #0000ff;">&gt;</span>

<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">body</span><span style="color: #0000ff;">&gt;</span>

<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">h1</span><span style="color: #0000ff;">&gt;</span>W3School Demo<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">h1</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">h2</span><span style="color: #0000ff;">&gt;</span>Resize this responsive page!<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">h2</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">br</span><span style="color: #0000ff;">&gt;</span>

<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="city"</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">h2</span><span style="color: #0000ff;">&gt;</span>London<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">h2</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">p</span><span style="color: #0000ff;">&gt;</span>London is the capital city of England.<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">p</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">p</span><span style="color: #0000ff;">&gt;</span><span style="color: #000000;">It is the most populous city in the United Kingdom,
with a metropolitan area of over 13 million inhabitants.</span><span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">p</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">div</span><span style="color: #0000ff;">&gt;</span>

<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="city"</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">h2</span><span style="color: #0000ff;">&gt;</span>Paris<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">h2</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">p</span><span style="color: #0000ff;">&gt;</span>Paris is the capital and most populous city of France.<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">p</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">div</span><span style="color: #0000ff;">&gt;</span>

<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="city"</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">h2</span><span style="color: #0000ff;">&gt;</span>Tokyo<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">h2</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">p</span><span style="color: #0000ff;">&gt;</span><span style="color: #000000;">Tokyo is the capital of Japan, the center of the Greater Tokyo Area,
and the most populous metropolitan area in the world.</span><span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">p</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">div</span><span style="color: #0000ff;">&gt;</span>

<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">body</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">html</span><span style="color: #0000ff;">&gt;</span>
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② 使用 Bootstrap,另一个创建响应式设计的方法,是使用现成的 CSS 框架。Bootstrap 是最流行的开发响应式 web 的 HTML, CSS, 和 JS 框架。Bootstrap 帮助您开发在任何尺寸都外观出众的站点:显示器、笔记本电脑、平板电脑或手机:

<span style="color: #0000ff;">&lt;!</span><span style="color: #ff00ff;">DOCTYPE html</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">html</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">head</span><span style="color: #0000ff;">&gt;</span>
  <span style="color: #0000ff;">&lt;</span><span style="color: #800000;">meta </span><span style="color: #ff0000;">charset</span><span style="color: #0000ff;">="utf-8"</span><span style="color: #0000ff;">&gt;</span>
  <span style="color: #0000ff;">&lt;</span><span style="color: #800000;">meta </span><span style="color: #ff0000;">name</span><span style="color: #0000ff;">="viewport"</span><span style="color: #ff0000;"> content</span><span style="color: #0000ff;">="width=device-width, initial-scale=1"</span><span style="color: #0000ff;">&gt;</span>
  <span style="color: #0000ff;">&lt;</span><span style="color: #800000;">link </span><span style="color: #ff0000;">rel</span><span style="color: #0000ff;">="stylesheet"</span><span style="color: #ff0000;"> 
  href</span><span style="color: #0000ff;">="http://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css"</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">head</span><span style="color: #0000ff;">&gt;</span>

<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">body</span><span style="color: #0000ff;">&gt;</span>

<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="container"</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="jumbotron"</span><span style="color: #0000ff;">&gt;</span>
  <span style="color: #0000ff;">&lt;</span><span style="color: #800000;">h1</span><span style="color: #0000ff;">&gt;</span>W3School Demo<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">h1</span><span style="color: #0000ff;">&gt;</span> 
  <span style="color: #0000ff;">&lt;</span><span style="color: #800000;">p</span><span style="color: #0000ff;">&gt;</span>Resize this responsive page!<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">p</span><span style="color: #0000ff;">&gt;</span> 
<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">div</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">div</span><span style="color: #0000ff;">&gt;</span>

<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="container"</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="row"</span><span style="color: #0000ff;">&gt;</span>
  <span style="color: #0000ff;">&lt;</span><span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="col-md-4"</span><span style="color: #0000ff;">&gt;</span>
    <span style="color: #0000ff;">&lt;</span><span style="color: #800000;">h2</span><span style="color: #0000ff;">&gt;</span>London<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">h2</span><span style="color: #0000ff;">&gt;</span>
    <span style="color: #0000ff;">&lt;</span><span style="color: #800000;">p</span><span style="color: #0000ff;">&gt;</span>London is the capital city of England.<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">p</span><span style="color: #0000ff;">&gt;</span>
    <span style="color: #0000ff;">&lt;</span><span style="color: #800000;">p</span><span style="color: #0000ff;">&gt;</span><span style="color: #000000;">It is the most populous city in the United Kingdom,
    with a metropolitan area of over 13 million inhabitants.</span><span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">p</span><span style="color: #0000ff;">&gt;</span>
  <span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">div</span><span style="color: #0000ff;">&gt;</span>
  <span style="color: #0000ff;">&lt;</span><span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="col-md-4"</span><span style="color: #0000ff;">&gt;</span>
    <span style="color: #0000ff;">&lt;</span><span style="color: #800000;">h2</span><span style="color: #0000ff;">&gt;</span>Paris<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">h2</span><span style="color: #0000ff;">&gt;</span>
    <span style="color: #0000ff;">&lt;</span><span style="color: #800000;">p</span><span style="color: #0000ff;">&gt;</span>Paris is the capital and most populous city of France.<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">p</span><span style="color: #0000ff;">&gt;</span>
  <span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">div</span><span style="color: #0000ff;">&gt;</span>
  <span style="color: #0000ff;">&lt;</span><span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="col-md-4"</span><span style="color: #0000ff;">&gt;</span>
    <span style="color: #0000ff;">&lt;</span><span style="color: #800000;">h2</span><span style="color: #0000ff;">&gt;</span>Tokyo<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">h2</span><span style="color: #0000ff;">&gt;</span>
    <span style="color: #0000ff;">&lt;</span><span style="color: #800000;">p</span><span style="color: #0000ff;">&gt;</span><span style="color: #000000;">Tokyo is the capital of Japan, the center of the Greater Tokyo Area,
    and the most populous metropolitan area in the world.</span><span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">p</span><span style="color: #0000ff;">&gt;</span>
  <span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">div</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">div</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">div</span><span style="color: #0000ff;">&gt;</span>

<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">body</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">html</span><span style="color: #0000ff;">&gt;</span>
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★ 后续继续学习bootstrap。

 

3.框架

通过使用框架,可以在同一个浏览器窗口中显示不止一个页面。每份HTML文档称为一个框架,并且每个框架都独立于其他的框架。

使用框架的坏处:

  • 开发人员必须同时跟踪更多的HTML文档
  • 很难打印整张页面
框架结构标签(<frameset>)
  • 框架结构标签(<frameset>)定义如何将窗口分割为框架
  • 每个 frameset 定义了一系列行
  • rows/columns 的值规定了每行或每列占据屏幕的面积

Frame 标签定义了放置在每个框架中的 HTML 文档。

在下面的这个例子中,我们设置了一个两列的框架集。第一列被设置为占据浏览器窗口的 25%。第二列被设置为占据浏览器窗口的 75%。HTML 文档 "frame_a.htm" 被置于第一个列中,而 HTML 文档 "frame_b.htm" 被置于第二个列中:

<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">frameset </span><span style="color: #ff0000;">cols</span><span style="color: #0000ff;">="25%,75%"</span><span style="color: #0000ff;">&gt;</span>
   <span style="color: #0000ff;">&lt;</span><span style="color: #800000;">frame </span><span style="color: #ff0000;">src</span><span style="color: #0000ff;">="frame_a.htm"</span><span style="color: #0000ff;">&gt;</span>
   <span style="color: #0000ff;">&lt;</span><span style="color: #800000;">frame </span><span style="color: #ff0000;">src</span><span style="color: #0000ff;">="frame_b.htm"</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">frameset</span><span style="color: #0000ff;">&gt;</span>
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① 假如一个框架有可见边框,用户可以拖动边框来改变它的大小。为了避免这种情况发生,可以在 <frame> 标签中加入:noresize="noresize"。

② 不能将 <body></body> 标签与 <frameset></frameset> 标签同时使用!

 

4.内联框架

① iframe 用于在网页内显示网页。

<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">iframe </span><span style="color: #ff0000;">src</span><span style="color: #0000ff;">="URL"</span><span style="color: #0000ff;">&gt;&lt;/</span><span style="color: #800000;">iframe</span><span style="color: #0000ff;">&gt;</span>
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②  Iframe - 设置高度和宽度

height 和 width 属性用于规定 iframe 的高度和宽度。

属性值的默认单位是像素,但也可以用百分比来设定(比如 "80%")。

<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">iframe </span><span style="color: #ff0000;">src</span><span style="color: #0000ff;">="demo_iframe.htm"</span><span style="color: #ff0000;"> width</span><span style="color: #0000ff;">="200"</span><span style="color: #ff0000;"> height</span><span style="color: #0000ff;">="200"</span><span style="color: #0000ff;">&gt;&lt;/</span><span style="color: #800000;">iframe</span><span style="color: #0000ff;">&gt;</span>
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③ Iframe - 删除边框 

frameborder 属性规定是否显示 iframe 周围的边框。设置属性值为 "0" 就可以移除边框:

<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">iframe </span><span style="color: #ff0000;">src</span><span style="color: #0000ff;">="demo_iframe.htm"</span><span style="color: #ff0000;"> frameborder</span><span style="color: #0000ff;">="0"</span><span style="color: #0000ff;">&gt;&lt;/</span><span style="color: #800000;">iframe</span><span style="color: #0000ff;">&gt;</span>
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④ 使用 iframe 作为链接的目标

iframe 可用作链接的目标(target),即在该frame中显示网页。链接的 target 属性必须引用 iframe 的 name 属性:

<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">iframe </span><span style="color: #ff0000;">src</span><span style="color: #0000ff;">="demo_iframe.htm"</span><span style="color: #ff0000;"> name</span><span style="color: #0000ff;">="iframe_a"</span><span style="color: #0000ff;">&gt;&lt;/</span><span style="color: #800000;">iframe</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">p</span><span style="color: #0000ff;">&gt;&lt;</span><span style="color: #800000;">a </span><span style="color: #ff0000;">href</span><span style="color: #0000ff;">="http://www.w3school.com.cn"</span><span style="color: #ff0000;"> target</span><span style="color: #0000ff;">="iframe_a"</span><span style="color: #0000ff;">&gt;</span>W3School.com.cn<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">a</span><span style="color: #0000ff;">&gt;&lt;/</span><span style="color: #800000;">p</span><span style="color: #0000ff;">&gt;</span>
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5.背景

背景属性将背景设置为图像。属性值为图像的URL。如果图像尺寸小于浏览器窗口,那么图像将在整个浏览器窗口进行复制。

URL可以是相对地址,如第一行代码。也可以使绝对地址,如第二行代码:

<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">body </span><span style="color: #ff0000;">background</span><span style="color: #0000ff;">="clouds.gif"</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">body </span><span style="color: #ff0000;">background</span><span style="color: #0000ff;">="http://www.w3school.com.cn/clouds.gif"</span><span style="color: #0000ff;">&gt;</span>
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6.头部

①<head> 元素是所有头部元素的容器。<head> 内的元素可包含脚本,指示浏览器在何处可以找到样式表,提供元信息,等等。以下标签都可以添加到 head 部分:<title>、<base>、<link>、<meta>、<script> 以及 <style>。

②<title> 标签定义文档的标题。title 元素在所有 HTML/XHTML 文档中都是必需的。

title 元素能够:

  • 定义浏览器工具栏中的标题
  • 提供页面被添加到收藏夹时显示的标题
  • 显示在搜索引擎结果中的页面标题

③HTML <base> 元素,<base> 标签为页面上的所有链接规定默认地址或默认目标(target):

<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">html</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">head</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">base </span><span style="color: #ff0000;">href</span><span style="color: #0000ff;">="http://www.w3school.com.cn/i/"</span> <span style="color: #0000ff;">/&gt;</span>
<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">base </span><span style="color: #ff0000;">target</span><span style="color: #0000ff;">="_blank"</span> <span style="color: #0000ff;">/&gt;</span>
<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">head</span><span style="color: #0000ff;">&gt;</span>

<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">body</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">img </span><span style="color: #ff0000;">src</span><span style="color: #0000ff;">="eg_smile.gif"</span> <span style="color: #0000ff;">/&gt;&lt;</span><span style="color: #800000;">br </span><span style="color: #0000ff;">/&gt;</span>
<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">p</span><span style="color: #0000ff;">&gt;</span>请注意,我们已经为图像规定了一个相对地址。由于我们已经在 head 部分规定了一个基准 URL,浏览器将在如下地址寻找图片:<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">p</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">p</span><span style="color: #0000ff;">&gt;</span>"http://www.w3school.com.cn/i/eg_smile.gif"<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">p</span><span style="color: #0000ff;">&gt;</span>


<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">body</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">html</span><span style="color: #0000ff;">&gt;</span>
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④ HTML <link> 元素,<link> 标签定义文档与外部资源之间的关系。<link> 标签最常用于连接样式表。

<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">head</span><span style="color: #0000ff;">&gt;</span>
<span style="color: #0000ff;">&lt;</span><span style="color: #800000;">link </span><span style="color: #ff0000;">rel</span><span style="color: #0000ff;">="stylesheet"</span><span style="color: #ff0000;"> type</span><span style="color: #0000ff;">="text/css"</span><span style="color: #ff0000;"> href</span><span style="color: #0000ff;">="mystyle.css"</span> <span style="color: #0000ff;">/&gt;</span>
<span style="color: #0000ff;">&lt;/</span><span style="color: #800000;">head</span><span style="color: #0000ff;">&gt;</span>
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7.文档类型

Web 世界中存在许多不同的文档。只有了解文档的类型,浏览器才能正确地显示文档。

HTML 也有多个不同的版本,只有完全明白页面中使用的确切 HTML 版本,浏览器才能完全正确地显示出 HTML 页面。这就是 <!DOCTYPE> 的用处。

<!DOCTYPE> 不是 HTML 标签。它为浏览器提供一项信息(声明),即 HTML 是用什么版本编写的。

HTML5:

<span style="color: #0000ff;">&lt;!</span><span style="color: #ff00ff;">DOCTYPE html</span><span style="color: #0000ff;">&gt;</span>
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到这儿W3C上HTML基础教程就看完啦,用了两天晚上的时间,看的还是比较快,要是之前也能这么静下心慢慢看说不定就能有更好的进步呢。

 

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