d. See <a href="guide/unit-testing#testing-transclusion-directives">Testing Transclusion Directives</a>.
</div>

<h4 id="transclusion-functions">Transclusion Functions</h4>
<p>When a directive requests transclusion, the compiler extracts its contents and provides a <strong>transclusion
function</strong> to the directive&#39;s <code>link</code> function and <code>controller</code>. This transclusion function is a special
<strong>linking function</strong> that will return the compiled contents linked to a new