<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN">
<html>
 <head>
  <title>:empty pseudo-class and XML/SGML constructs</title>
  <style type="text/css">
 address:empty { background: lime; }
 address { background: red; margin: 0; height: 1em; }
 .text { margin: -1em 0 0 0; }
</style>
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