关于网页中第一行<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">代码 我最近编码一直用EDITPLUS,经理给了一JQuery的问题,让给解决了.弄了一天也没有找到什么原因,我在网上下了一些最后的代码,自己重写了一个也好用,可是经理给的那个了没有什么错呀!为什么在…
https://validator.w3.org/nu/?doc=http%3A%2F%2Fdev.mysql.com%2Fdoc%2Frefman%2F5.7%2Fen%2Fmanual-info.html Error: Bad value up for attribute rel on element link: The string up is not a registered keyword. From line 24, column 1; to line 24, column 72 t…
<!-- This is the HTML 4.01 Frameset DTD, which should be used for documents with frames. This DTD is identical to the HTML 4.01 Transitional DTD except for the content model of the "HTML" element: in frameset documents, the "FRAMESET&quo…
<!-- This is the HTML 4.01 Transitional DTD, which includes presentation attributes and elements that W3C expects to phase out as support for style sheets matures. Authors should use the Strict DTD when possible, but may use the Transitional DTD when…