for Atom and RSS and KML
This feed does not validate.
line 1, column 0: Undefined root element: meta [help]
<meta http-equiv="refresh" content="0; url=https://www.class.com.hk" />
In addition, interoperability with the widest range of feed readers could be improved by implementing the following recommendation.
Feeds should not be served with the "text/html" media type [help]
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