html成对标记有：html，head，title，h1，pre，u，b，i，tt，cite，em，strong，font，basefont，big，small，strike，code，kbd，samp，var，dfn，sup，sub等。
本教程操作环境：windows7系统、CSS3&&HTML5版、Dell G3电脑。
双标记：由 “始标记 ”和 “尾标记 ”两部分构成。它必须成对出现。
这类标记的语法是： 内容 标记 >
html常用的成对标记
创建一个HTML文档
设置文档标题和其它在网页中不显示的信息下划线
黑体字
斜体字
打字机风格的字体
引用,通常是斜体
强调文本(通常是斜体加黑体)
加重文本(通常是斜体加黑体)
设置字体大小从1到7，颜色使用名字或RGB的十六进制值
字体加大
字体缩小
加删除线
程式码
键盘字
范例
变量
向右缩排述语定义
地址标记上标字
下标字
创建一个段落 从两边缩进文本Link flag table flag
Extension:
Link tag
Create a link to automatically send an email
Create a bookmark located inside the document
Create a link to a bookmark located inside the document
Defines the relationship between a link and the source
target="..."Determines where the link source is displayed (user-defined name, _blank,_parent,_self,_top
rel="... "The type of link to send
rev="..." The type of link to save
accesskey="..." specifies this element The hotkey
shape="..." allows us to define a client-side graphic mirror using a defined shape (default, rect, circle, poly
coord="..."Use pixels or length percentage to define the size of the shape
tabindex="..."Use the defined tabindex element to set on each element The order of focus acquisition between them (use the tab key to make the element focus)
Recommended learning: html video tutorial
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