2 <p>Test that a regular block can become a spanner.
</p>
3 <p>Below there should be a blue box, then a yellow box, then a blue box again.
</p>
4 <div style=
"overflow:hidden; line-height:2em; background:blue;">
5 <div style=
"margin:4em 0; background:yellow;"><br><br></div>