在HTML5中，doctype标签的正确用法是（ ）。
- A.＜!DOCTYPE HTML5>
- B.＜!DOCTYPE html>
- C.＜!DOCTYPE HTML PUBLIC"-//W3C//DTD HTML5.0/EN""http://www.w3.org/TR/html5/strict.dtd">
- D.＜html>
正确答案及解析
正确答案
解析
本题考查HTML中doctype标签的用法。
＜!DOCTYPE>声明位于HTML文档中的第一行，处于＜html>标签之前。告知浏览器的解析器用什么文档标准解析这个文档。DOCTYPE不存在或格式不正确会导致文档以兼容模式呈现。
标准模式的排版和JS运作模式都是以该浏览器支持的最高标准运行。在兼容模式中，页面以宽松的向后兼容的方式显示，模拟老式浏览器的行为以防止站点无法工作。HTML5只需要写＜!DOCTYPE HTML>
综合分析，本题选B。
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