Deprecated HTML Doctype and Use of XHTML in HTML5 Context #19
Description
The HTML document uses an outdated XHTML 1.0 Transitional doctype declaration:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
along with the xmlns and self-closing tag syntax. This doctype and syntax were standard in early 2000s but are no longer recommended. For modern web development, HTML5 should be used:
<!DOCTYPE html>
This simplifies syntax, improves browser compatibility, and allows use of newer HTML and CSS features. Unless there's a specific reason to stick to XHTML (such as legacy system constraints), this document should be updated to use the HTML5 doctype and conforming syntax.