Added note about animated images, as per https://www.w3.org/Style/CSS/Tracker/actions/441

Author: vhardy

css3-exclusions/Exclusions.src.html

@@ -1264,7 +1264,10 @@ <h3 id="shapes-from-image">Shapes from Image</h3>
           them. In order to avoid that, another exclusion element can be overlaid.
       </p>
 
-      
+      <p>For animated raster image formats (such as <a href="http://www.w3.org/Graphics/GIF/spec-gif89a.txt">GIF</a>), the first frame of the animation
+          sequence is used. For <a href="http://www.w3.org/TR/2002/WD-SVG2Reqs-20020422/">SVG</a> images 
+          ([[SVG11]]), the image is rendered without animations applied.</p>
+          
       <!-- End section "Shapes from image" -->
 
       <h3 id="declaring-shapes">Declaring Shapes</h3>

css3-exclusions/Overview.html

@@ -1723,7 +1723,14 @@ <h3 id=shapes-from-image><span class=secno>4.3. </span>Shapes from Image</h3>
 
   <p class=note> Note, images can define cavities and inline flow content
    should wrap inside them. In order to avoid that, another exclusion element
-   can be overlaid.</p>
+   can be overlaid.
+
+  <p>For animated raster image formats (such as <a
+   href="http://www.w3.org/Graphics/GIF/spec-gif89a.txt">GIF</a>), the first
+   frame of the animation sequence is used. For <a
+   href="http://www.w3.org/TR/2002/WD-SVG2Reqs-20020422/">SVG</a> images (<a
+   href="#SVG11" rel=biblioentry>[SVG11]<!--{{SVG11}}--></a>), the image is
+   rendered without animations applied.</p>
   <!-- End section "Shapes from image" -->
 
   <h3 id=declaring-shapes><span class=secno>4.4. </span>Declaring Shapes</h3>
@@ -2346,6 +2353,16 @@ <h3 class=no-num id=other-references>Other references</h3>
     href="http://www.w3.org/TR/2011/WD-css3-grid-layout-20110407">http://www.w3.org/TR/2011/WD-css3-grid-layout-20110407</a>
     </dd>
    <!---->
+
+   <dt id=SVG11>[SVG11]
+
+   <dd>Erik Dahlstr&#246;m; et al. <a
+    href="http://www.w3.org/TR/2011/REC-SVG11-20110816/"><cite>Scalable
+    Vector Graphics (SVG) 1.1 (Second Edition).</cite></a> 16 August 2011.
+    W3C Recommendation. URL: <a
+    href="http://www.w3.org/TR/2011/REC-SVG11-20110816/">http://www.w3.org/TR/2011/REC-SVG11-20110816/</a>
+    </dd>
+   <!---->
   </dl>
   <!--end-informative-->