ght"></a></dt>
<dd><p>Must be a valid CSS unit (like <code>'100%'</code>,
<code>'400px'</code>, <code>'auto'</code>) or a number, which will be coerced to a
string and have <code>'px'</code> appended.</p></dd>


<dt id="arg-expr">expr<a class="anchor" aria-label="anchor" href="#arg-expr"></a></dt>
<dd><p>An expression that generates a NGLVieweR.</p></dd>


<dt id="arg-env">env<a class="anchor" aria-label="anchor" href="#arg-env"></a></dt>
<dd><p>The environment in which to evaluate <code>expr</code>.</p></d