The following is an example of HTML markup codes:
<HTML>
<HEAD>
<TITLE>HTML example</TITLE>
</HEAD>
<BODY>
<H1>HTML example</H1>
<P>The following is an example of HTML markup codes:</P>
...and so on recursively...
Markup codes usually come in pairs, enclosing the text which they format. The entire file is bracketed by HTML codes. Within this are two main sections, the "TITLE" and "BODY" blocks. Paragraphs in the body text are enclosed within "P" codes, and so on. Linear whitespace is ignored; any number of blank lines may be left between codes to make it easier to read the raw HTML file.
Links are easy to code, though they have been omitted from the above example for simplicity.