mdn · chrisdavidmills · Feb 16, 2021 · Feb 15, 2021 · Feb 15, 2021 · Feb 15, 2021
@@ -55,7 +55,13 @@ <h2 id="Usage_notes">Usage notes</h2>
 
 <h2 id="Workaround_for_backgroundImage">Workaround for BackgroundImage</h2>
 
-<p>Instead of using <code>in="BackgroundImage"</code>, we need to import one of the images to blend inside the filter itself, using an <code>&lt;feImage&gt; element</code>.</p>
+<p><code>BackgroundImage</code> is not supported as a filter source in modern browsers (see the <a href="/en-US/docs/Web/SVG/Element/feComposite#browser_compatibility">feComposite compatibility table</a>). We therefore need to import one of the images to blend inside the filter itself, using an <code>&lt;feImage&gt;</code> element.</p>
+
+<div class="notecard note">
+      <h4>Note</h4>
+      <p>Firefox <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=455986">Bug 455986</a> means that <code>feImage</code> cannot load partial images, including circles, rectangles, paths or other fragments defined in the document. So that this example works on more browsers, a full external image of the logo is loaded.</p> 
+</div>
+
 
 <h3 id="HTML">HTML</h3>