1.什么是HTML标记语言？
HTML是表示网页信息的符号标记语言。
2.HTML的标记和他的属性
- HTML文档的保存格式：.html、.htm、.xhtml
- 标记和被标记的内容构建出HTML文档。格式：内容标记>
- 标记的属性（用来控制图像、文本等如何的显示）格式：内容标记>
3.语法不区分字母大小写
、、都是定义相同的标记，但是在编写网页的使用尽量使用小写。
4.文档注释
注释一段内容时使用""结束。
例如:
<span style="color: #008000;"><!--</span><span style="color: #008000;">这是文档的注释</span><span style="color: #008000;">--></span>
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