html的version属性是什么意思?

看起來跟這個有關係 http://www.zhihu.com/question/20527726

http://www.w3.org/QA/2007/05/html_and_version_mechanisms.html

People are requesting a version number to be able

to switch between two different modes of rendering. to author with specific requirements and/or semantics to convert from one version to another one to create helping tool for authoring document to validate to evolve the semantics of elements and attributes

正解 再也不敢用禁止广告插件了