ck element must be removed.
</li>
<li>Line feed characters within a block element must be converted into a
space (except when the 'xml:space' attribute is set to 'preserve').
</li>
<li>
A sequence of white space characters must be reduced to a single space
character (except when the 'xml:space' attribute is set to 'preserve').
</li>
<li>
With regard to rendition,
the User Agent should render the content in a
manner appropriate to the language in which the content is written.
In languages whose primary scrip