<p>Access the union of all <code class="prettyprint lang-dart">CssStyleDeclaration</code>s that are associated with an
<code class="prettyprint lang-dart">ElementList</code>.</p>
<p>Grouping the style objects all together provides easy editing of specific
properties of a collection of elements. Setting a specific property value
will set that property in all <code class="prettyprint lang-dart">Element</code>s in the <code class="prettyprint lang-dart">ElementList</code>. Getting a
specific property value wil