nice header to start with
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>TITLE HERE</title>
<link rel="stylesheet" type="text/css" href="PATH TO STYLESHEET FILE" />
</head>
<body>
see css
XHTML VALIDATE http://validator.w3.org/check?uri=referer
https://www.w3.org/TR/xhtml11/conformance.html
http://tantek.com/XHTML/Test/minimal11.html
Necessary to add link tag for favicon.ico? https://stackoverflow.com/questions/10218178/necessary-to-add-link-tag-for-favicon-ico
How to Add a Favicon to your Site https://www.w3.org/2005/10/howto-favicon
Output Formats https://www.graphviz.org/doc/info/output.html –> Icon Image File Format
How do I convert a .PNG into a .ICO? https://superuser.com/questions/227736/how-do-i-convert-a-png-into-a-ico
HTML & web development tips https://pbraun.nethence.com/unix/lang/wwwdev.html
How do I convert a .PNG into a .ICO? https://superuser.com/questions/227736/how-do-i-convert-a-png-into-a-ico
Favicon Generator https://redketchup.io/favicon-generator
https://www.websiteplanet.com/webtools/favicon-generator/ thx Abby Brooks
https://www.w3.org/2005/10/howto-favicon
https://stackoverflow.com/questions/18301745/how-to-set-up-a-favicon