HTML tag programming compatibility considerations

为页面添加DOCTYPE

由于不同浏览器对标签,样式表的解释不尽相同,所以需要为html文件定义一个标准的文档类型,使不同浏览器尽量按照一个统一的html标准来解析渲染页面。

!DOCTYPE 声明指定文档遵从的 DTD，如：

e3715f1610168c339767970d7e8a4742

注意标签及属性的大小写

有的时候，有些绑定在元素上的事件在IE浏览器下响应，在safari或其他浏览器下却不响应。这时候需要检查事件绑定方式的正确性，高级事件的绑定需要区别IE和其他浏览器写两套javascript，而简单事件模型需要注意一下绑定事件名的大小写。如：

这里应该用小写的onfocus，并且显示的添加标签闭合符号才是规范的写法。

注意标签的属性值设置

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