charset -> utf-8
meta -> viewport -> width=device-width, initial-scale=1
link -> stylesheet -> index.css
title -> Hello, World!
div
 h1 -> Example Domain
 p -> This domain is established to be used for illustrative examples in documents. You may use this domain in examples without prior coordination or asking for permission.
 a -> href='http://www.iana.org/domains/example' -> More information...
end -> div

// -> This is the example.com demo. Try this out in your browser... it looks just like example.com!