Document Type Definition in html_问答_开发者_运维开发者技术经验分享

开发者 https://www.devze.com 2023-01-19 14:20 出处：网络

If i add the Js Script above This Line <!DOCTYPE HTML PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\"> Then CSS Is notworking. Is Th

相关专题：javascript

If i add the Js Script above This Line <!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> Then CSS Is not working. Is There is any way to solve this issue

<script type="text/javascript">
<?php  $data3  = getmaildata(); ?>
var collection = [<?php echo  $data3; ?>]; 
</script>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org  开发者_如何学JAVA/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>.:: sample ::.</title>
<link rel="stylesheet" href="css/stylesheet.css" type="text/css">

A script element can appear in the head or in the body, it can't appear before the Doctype and no element can appear outside the root element (<html>).

If the Doctype (with a couple of provisos which don't apply in this case) isn't the very first thing in a document then browsers will enter Quirks mode (and emulate bugs seen in older browsers with CSS and DOM handling).

There is no way around this (that is well supported by browsers), so just write valid code and don't try to put a script element somewhere that it isn't allowed.

<script> tags are usually placed in <head> or just before </body>, I don't know if it's related but your code is still invalid.

What happens if you put the SCRIPT element in its proper place, inside the HEAD section or in the BODY? Also, I don't know what $data3 contains, but if it's a string and not an integer for instance, then it should be encapsulated in quotation marks.

The doctype declaration should be the very first thing in an HTML document, before the tag.

The doctype declaration is not an HTML tag; it is an instruction to the web browser about what version of the markup language the page is written in.

The doctype declaration refers to a Document Type Definition (DTD). The DTD specifies the rules for the markup language, so that the browsers can render the content correctly.

http://www.w3schools.com/tags/tag_DOCTYPE.asp