Add a note about animated images

whatwg · Mar 24, 2017 · 412ce14 · 412ce14
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commit 412ce14
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@@ -25588,6 +25588,11 @@ interface <dfn>HTMLImageElement</dfn> : <span>HTMLElement</span> {
       undefined.</p>
      </dd>
     </dl>
+
+    <p class="note">Animated images will become <span data-x="img-all">completely available</span>
+    only after all their frames are loaded. Thus, even though an implementation could decode the
+    first frame before that point, the above steps will not do so, instead waiting until all frames
+    are available.</p>
    </li>
 
    <li><p>Return <var>promise</var>.</p></li>