Only the following HTML elements are permitted:
<a>/</a>
<b>/</b>
<br>
<em>/</em>
<i>/</i>
<p>[/</p>]
<pre>/</pre>
<strong>/</strong>
Each <a>
element must have an
href
attribute (with a value).
No other attributes are permitted.
The only character references permitted are &
,
>
, <
and "
,
and these must be used (for '&', '>', '<',
and '"', respectively) in all non-markup text and in the values
of href
attributes.