Code for CSS display highlighted by JavaScript

In the tutorial of www.bkjia.com, I saw a brilliant expert on the Internet who used strings instead of regular expressions to highlight and display Javascript code. I benefited a lot, so I conceived the CSS code highlighting. Compared with JavaScript, CSS syntax is much simpler. It mainly deals with comments, strings, CSS style names, CSS style values, indentation, and line breaks. For details, see the code.

<! DOCTYPE html PUBLIC "-// W3C // dtd xhtml 1.0 Transitional // EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 





Tip: the code can be modified before running!