[1] Xanga Safety ( 版) <http://safety.xanga.com/>
<li>Filed under: <a href="http://safety.xanga.com/category/safetyfeatures/" title="View all posts in Safety Features" rel="category tag">Safety Features</a></li>
[2] IRC logs: freenode / #whatwg / 20120730 ( ( 版)) <http://krijnhoetmer.nl/irc-logs/whatwg/20120730#l-674>