好像是不支持ff. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd" [ <!ELEMENT a (#PCDATA | table)* > ]><html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" ><head><meta http-equiv="Content-Type" content="application/xhtml+xml; charset=UTF-8" /><title>纯CSS下拉菜单，兼容IE和FF</title>> 相关文章：