3 <p style=
"color: green">This text should be green if viewport is wider than
30em. This tests that (max-width:
30em) can evaluate to false.
</p>
4 <div style=
"width: 30em; background-color: lightblue;">div of length
30 em
</div>
5 <div style=
"width: 800px; background-color: lightblue;">div of length
800px
</div>