下面哪种HTML文件声明是HTML5的? A: xmlns="http://www.w3.org/1999/xhtml"> B: /span>html> C: /span>HTMLPUBLIC"-//W3C//DTDHTML4.01//EN""http://www.w3.org/TR/html4/strict.dtd"> D: /span>htmlPUBLIC"-//W3C//DTDXHTML1.1//EN""http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

HTML5 标准的 doctype 声明的是 ()。 A.<! DOCTYPE HTML PUBLIC"-//W3C//DTD XHTML1.0 Strict//EN"" http ://www.w3.org/ TR / xhtml1 / DTD / xhtml1-strict.dtd" > B.< ! DOCTYPE HTMLPUBLIC" //W3C //DTD HTML4.01Transitional//EN""http ://www.w3.org/ TR / html4 / loose.dtd" > C.< ! DOCTYPE HTML> D.< !DOCTYPE HTMLPUBLIC"- //W3C //DTD XHTML1.1 //EN""http ://www.w3.org/ TR / xhtml11 / DTD / xhtml11.dtd" >