<!DOCTYPE html>
<p>Test that an empty spanner B between spanners A and C prevents margins on A and C from collapsing.</p>
<p>There should be a blue square below.</p>
<div style="width:10em; height:10em; background:blue;"></div>
<!DOCTYPE html>
<p>Test that an empty spanner B between spanners A and C prevents margins on A and C from collapsing.</p>
<p>There should be a blue square below.</p>
<div style="width:10em; height:10em; background:blue;"></div>