HTML CSS
(a quick guide)
Single empty space   2 empty spaces   4 empty spaces
<p>First paragraph</p> <p>Second Paragraph</p>
First Line.<br> Second Line.<br> Third Line.
<pre>This will retain all empty spaces and line breaks as-it-is. </pre>
<p style="padding: 10px; margin: 10px;"> FOO </p>
<p style="letter-spacing: 5px; word-spacing: 10px; line-height: 15px"> FOO </p>