gecko-dev/layout/reftests/svg/smil/anim-svg-preserveAspectRatio-01.svg

<svg xmlns="http://www.w3.org/2000/svg"
     xmlns:xlink="http://www.w3.org/1999/xlink"
     class="reftest-wait"
     onload="setTimeAndSnapshot(1, true)">
  <title>Test animation of the "preserveAspectRatio" attribute on the "svg" element</title>
  <script xlink:href="smil-util.js" type="text/javascript"/>
  <rect width="100%" height="100%" fill="lime"/>

  <!-- 40% through animation simple duration -
       tests that the animation doesn't affect the element too early -->
  <svg width="100" height="50" viewBox="0 0 100 100"
       preserveAspectRatio="xMidYMid meet">
    <!-- this should change the referencing element at 1.25s,
         causing the red rect to stretch to fill its whole viewport -->
    <animate attributeName="preserveAspectRatio"
             calcMode="discrete"
             begin="0s" dur="2.5s"
             from="xMidYMid meet"
             to="xMidYMid slice"
             fill="freeze"/>
    <rect width="100%" height="100%" fill="red"/>
  </svg>
  <rect x="25" width="50" height="50" fill="lime"/>

  <!-- 50% through animation simple duration -
       tests that the animation affects the element now -->
  <rect y="50" width="100" height="50" fill="red"/>
  <svg y="50" width="100" height="50" viewBox="0 0 100 100"
       preserveAspectRatio="xMidYMid meet">
    <!-- this should change the referencing element at 1s,
         causing the lime rect to stretch to fill its whole viewport -->
    <animate attributeName="preserveAspectRatio"
             calcMode="discrete"
             begin="0s" dur="2s"
             from="xMidYMid meet"
             to="xMidYMid slice"
             fill="freeze"/>
    <rect width="100%" height="100%" fill="lime"/>
  </svg>
</svg>