Display this line in Arial text.
Display this line in Verdana text.
Display this line in Bold text.
Display this line in Italic text.
Display this line in size 5 text using font tag.
Display this line in -2 size text using font tag.
Display this line in Big text.
Display this line in Small text.
Display this line in red color text.
Display this line in #006400 color text.
Display a² + b² = c²
Display H₂O
Display this line in Strike out text.
Display this line in Underlined text.
Display this line in monospaced text.

Display this line in Heading size 2 text.

This is the main level.

Now make some text indented one level as you see here.
Use the blockquote tag to do the indentation.
One more line, and that will be it.

Put exactly four spaces    between the words.