<p class=note>"Whitespace" is a mass noun.

<div class=note>

<p>The XML, JSON, and parts of the HTTP specifications exclude U+000C FF in their definition of

whitespace:

<ul class=brief>

<li>[[xml10#NT-S|XML's S production]]

<li>[[JSON#section-2|JSON's ws production]]

<li>[=HTTP whitespace=]

</ul>

<p>Prefer using Infra's [=ASCII whitespace=] definition for new features, unless your specification

deals exclusively with XML/JSON/HTTP.

</div>

<p>A <dfn export>C0 control</dfn> is a <a>code point</a> in the range U+0000 NULL to

U+001F INFORMATION SEPARATOR ONE, inclusive.