CodeMirror 2: Active Line Demo

    <description>codemirror: http://cloud-ide.com — they're springing up like mushrooms. This
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<?xml version="1.0" encoding="UTF-8"?>
<rss xmlns:atom="http://www.w3.org/2005/Atom" version="2.0"
     xmlns:georss="http://www.georss.org/georss"
     xmlns:twitter="http://api.twitter.com">
  <channel>
    <title>Twitter / codemirror</title>
    <link>http://twitter.com/codemirror</link>

Styling the current cursor line.