JSP页面中,在<html></html>上面经常会有一句话:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
一直不知道是什么意思,也没有过多关注过这句话。今天有个界面兼容性的BUG,改了这句话就好用了,因此稍微查找了一些资料,对其初有了解,总结如下:
DOCTYPE(Document Type),文档类型,一个DOCTYPE是一种标准通用标记语言的文档类型声明,它的目的是要告诉标准通用标记语言解析器,它应该用什么样的文档类型定义(DTD)来解析文档。
只有确定了一个正确的文档类型,超文本或可扩展超文本中的标签和层叠样式表才能生效,甚至对JavaScript都会有所影响。
XHTML1.0提供了三种DOCTYPE可选择:
(1)过渡型(Transitional )
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
(2)严格型(Strict )
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
(3)框架型(Frameset )
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd">
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