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Why does document. firstChild not find the html node or the firstchild text node?

Source: Internet
Author: User
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Why does document. firstChild not find the html node or the firstchild text node?

DOM is developed for HTML4.01. We are now using XHTML1.0.

Therefore, to use attributes and methods in the core DOM, you must remove the DTD type definition.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<! DOCTYPE html PUBLIC "-// W3C // dtd xhtml 1.0 Transitional // EN "" http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd "> <Html xmlns =" http://www.w3.org/1999/xhtml "> <Head> <title> new document </title> <meta http-equiv =" Content-Type "content =" text/html; charset = UTF-8 "/> <meta name =" author "content =" "/> <link rel =" stylesheet "type =" text/css "href =" "/> <style type = "text/css"> </style> <script type = "text/javascript"> </script>

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