ence/contrast_ratio.html" class="external-link">colorspace::contrast_ratio()</a></code> for the input and potential output
color.</p></dd>


<dt id="arg-direction">direction<a class="anchor" aria-label="anchor" href="#arg-direction"></a></dt>
<dd><p><code>numeric</code> that defines the initial direction,
where values &gt;= 0 start by making colors lighter, and values &lt; 0
make colors darker.</p></dd>


<dt id="arg-returntype">returnType<a class="anchor" aria-label="anchor" href="#arg-returntype"></a></dt