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 Tip: Use Lowercase Tagshttp://www.w3schools.com/html/html_elements.aspHTML 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.
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