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HTML 页面开头doctype应该大写还是小写？

WBOY
Release： 2016-06-07 08:44:19
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这些写法都是有效的，但是哪种才是规范推荐使用的

回复内容：

HTML5 中不区分大小写！

HTML5/syntax

一个DOCTYPE必须包含以下部分，并严格按照顺序出现：

一个ASCII字符串"，大小写不敏感。

HTML 页面开头doctype应该大写还是小写？这是vs默认模板。

HTML 页面开头doctype应该大写还是小写？这是知乎的页面源码。

HTML 页面开头doctype应该大写还是小写？
腾讯的。

HTML 页面开头doctype应该大写还是小写？
京东的。

所以，你看着办吧。

题主你让我分心了，阿弥陀佛，工作工作。 在XHTML标准下，所有标签名必须小写。这个也是个标签吧？ html 对大小写是不敏感的，不管是 doctype 还是 DOCTYPE 都是可以的，甚至 p 和 P，h1 和 H1 也都可以，哪个习惯就用哪个。 html5（包括4）不区分大小写，但是建议小写，因为xhtml是要求小写的
HTML Tip: Use Lowercase Tags

HTML tags are not case sensitive:

means the same as

.

The HTML5 standard does not require lowercase tags, but W3C recommends lowercase in HTML4, and demands lowercase for stricter document types like XHTML.

w3schools.com/html/html

至于doctype，我是依照建议小写的……
Related labels：
doctype gt html lt
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