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<html>
 <head>
  <title>:checked pseudo-class</title>
  <style type="text/css">input, span { background-color : red }
input:checked, input:checked + span { background-color : lime}
</style>
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 </head>
 <body>
<p>
<input type="checkbox" checked="checked"> <span>Everything in this paragraph should have a green background</span></p>
</body>
</html>