trouble getting declared namespaces to work

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I am trying to get namespaces written in an external css (two separate files actually). When I run the file on my browser it will not use the declared namespaces. I think that t

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温柔的废话

2021-01-24 03:24
In your XHTML:
1. Your markup is not well-formed:
  - Your XML declaration should come first, then your doctype declaration:
```
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
```
  - Some of your <link /> tags aren't closed properly, they should be:
```
<link rel="stylesheet" href="movies.css"  type="text/css" />
<link rel="stylesheet" href="actors.css" type="text/css" />
```
2. Your page must be served as application/xhtml+xml by the server. Typical servers don't know that you're serving XHTML, so they send them as text/html instead. Browsers won't be able to treat text/html files as XML, so they won't apply CSS to your custom XML elements.
  
  If you work with PHP, it's simply a matter of adding this to the very top of your XHTML file:
```
<?php header('Content-Type: application/xhtml+xml'); ?>
```
  Or in ASP, add this:
```
<% Response.ContentType = "application/xhtml+xml"; %>
```
  You should also have an accompanying meta tag, but it's not necessary for your page to validate, and browsers ignore it anyway:
```
<meta http-equiv="Content-Type" content="application/xhtml+xml; charset=utf-8" />
```
  You can find a short history lesson on UAs treating XHTML as HTML tag soup in this answer to better understand this.
In your CSS:
1. It's font-weight: bold, not font-style: bold.
2. It's font-style: italic, not font-style: italics.
3. Make sure that your @namespace statements are placed at the beginning of your stylesheets. From the spec:
  
  Any @namespace rules must follow all @charset and @import rules and precede all other non-ignored at-rules and rule sets in a style sheet.
But with all that said, why aren't you placing your actors and movies into their own XML files, then transforming them using XSLT into familiar, actual XHTML?
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