<Em>: emphasizes the role of the browser shown in italics;
<I>: in italics;
<Big>: large fonts;
<Small>: small word;
<Strong>: bold;
<Sub>: subscript;
<Sup>: superscript;
<Del>: Delete the word;
<code>: the label text is used to represent computer source code or other machine-read, the current display font width in the browser ;
<Tt>: shows a broad effect of fonts;
<Kbd>: change tags in the text represented by a keyboard, a display font width in the browser;
<samp>: tag indicates some of its users should be no other explanation of text characters. When the normal context extracted from these characters, usually to use this label. (Expressed do not understand, anyway, is not commonly used, study it later);
<var>: definition of variables, indicates the name of the variable, or the value supplied by the user, is generally shown in italics;
<Pre>: pretreatment, reserved spaces and line breaks.
<Abbr>: definition of abbreviations, such as: to make the title HTML5, tag write H5, H5 interface is displayed, when the mouse is moved to H5, a floating window will display the full name;
<Address>: address defined, such as e-mail address;
<Dbo>: text direction, when the attribute value dir LTR (I understand: left to right) the text direction is from right to left, the opposite of the normal display;
<Blockquote>: define a reference length, it will increase its margins, and before and after increasing the wrap;
<Q>: Short reference, it increases its marks;
<Cite>: a reference, expressed in books, documents and other references;
<Dfn>: specific terms or phrases.
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<meta charset="utf-8">
<h1 style="color: red; text-align: center">文本格式化输出</h1>
<b><em>b标签</em>，定义粗体文字</b>
<br />
<big><em>big标签</em>，定义大号字</big>
<br />
<em><em>em标签</em>，定义着重文字</em>
<br />
<i><em>i标签</em>，定义斜体字</i>
<br />
<em style="color: red">PS:具体到这两个标签，<em>表示被强调呈现的内容，<i>是物理上的斜体，没有内容上的意义。</em>
<!--具体到这两个标签，<em>表示被强调呈现的内容，<i>是物理上的斜体，没有内容上的意义。-->
<br />
<small><em>small标签</em>，定义小号字</small>
<br />
<strong><em>strong标签</em>，定义加重语气</strong>
<p>这是对比<sub><em>sub标签</em>，定义下标字</sub></p>
<p>这是对比<sup><em>sup标签</em>，定义上标字</sup></p>
<del><em>del标签</em>，定义删除字</del>
<br />
<h1 style="color: red; text-align: center">计算机输出标签</h1>
<p><em>code标签</em>，定义计算机代码<br />
<code>
int a = 1;
int b = 3;
if(a > b)
printf("好好学习\n");
else
printf("天天向上\n");
</code>
</p>
<p><em>kbd标签</em>，定义键盘码<br /><kbd>键盘码//</kbd></p>
<!--<samp> 标签并不经常使用。只有在要从正常的上下文中将某些短字符序列提取出来，对它们加以强调的极少情况下，才使用这个标签。-->
<p><em>samp标签</em>，定义计算机代码样本<br />
<samp>
int a = 1;
int b = 3;
if(a > b)
printf("好好学习\n");
else
printf("天天向上\n");
</samp>
</p>
<p><em>tt标签</em>，定义打字机代码<br />
<tt>
int a = 1;
int b = 3;
if(a > b)
printf("好好学习\n");
else
printf("天天向上\n");
</tt>
</p>
<p><em>var标签</em>，定义变量<br />
<var>
int a = 1;
int b = 3;
if(a > b)
printf("好好学习\n");
else
printf("天天向上\n");
</var>
</p>
<p><em>pre标签</em>，定义预格式文本，可以保留空格和换行<br />
<pre>
int a = 1;
int b = 3;
if(a > b)
printf("好好学习\n");
else
printf("天天向上\n");
</pre>
</p>
<h1 style="color: red; text-align: center;">引用、引用和术语定义</h1>
<p><em>abbr标签</em>，定义缩写<br /><abbr title="html5">h5</abbr></p>
<p><em>address标签</em>，定义地址（比如电子邮件地址），可以是地址，签名或者文档作者的身份<br /><address>如有疑问请联系<a href="mailto:[email protected]">HJ</a><br/>2018年4月27日</address></p>
<p><em>bdo标签</em>，定义文字的方向，如果dir属性为rtl则会将bdo标签内的内容从右到左显示<br /><bdo dir="rtl">从右到左显示该句话<br /><h3>这句也是</h3></bdo></p>
<p><em>blockquote标签</em>定义长的引用,浏览器在 blockquote 元素前后添加了换行，并增加了外边距。<br /><blockquote>这是引用<br />这是引用<br />这是引用</blockquote><br /></p>
<p><em>q标签</em>，定义短的引用语，浏览器在引用的周围插入了引号<br />欧文：<q>真理惟一可靠的标准就是永远自相符合。</q></p>
<p><em>cite标签</em>，引用 ，它所包含的文本对某个参考文献的引用，比如书籍或者杂志的标题<br /><a href="http://www.w3school.com.cn/tags/tag_cite.asp"><cite >cite标签</cite></a><br />如果引用的这些文档有联机版本，还应该把引用包括在一个 a标签中，从而把一个超链接指向该联机版本</p>
<p><em>dfn标签</em>，dfn标签可标记那些对特殊术语或短语的定义<br /><dfn>函数</dfn><br />c语言中有函数</p>
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