title: Start SVG animation on entering viewport
body: <p>I found few solutions for my problem and they are pretty similar. I used this one <a href="https://stackoverflow.com/questions/46969358/how-to-start-an-animated-svg-on-entering-viewport">How to start an animated SVG on entering viewport?</a>.</p>
  
  <p>In every solution it says to set the begin attribute to "indefinite", but when I do that instead of 0s, my animation won't run.</p>
  
  <p>This is my code: <a href="https://jsfiddle.net/zwcy0och/7/" rel="nofollow noreferrer">https://jsfiddle.net/zwcy0och/7/</a></p>
  
  <p>My animation should work like this: <a href="https://jsfiddle.net/v3p67rt4/" rel="nofollow noreferrer">https://jsfiddle.net/v3p67rt4/</a></p>
  
  <p>HTML:</p>
  
  <pre><code>&lt;p&gt;Scroll down&lt;/p&gt;
  
  
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        &lt;rect id="shadow" x="0" y="-1" width="700" height="60"  &gt;
         &lt;animate attributeName="x" dur="4s" begin="indefinite" from="-700" to="0" /&gt;
        &lt;/rect&gt; 
      &lt;/clipPath&gt; 
    &lt;/defs&gt;
  
    &lt;!--  White cross --&gt;
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  &lt;/g&gt;&lt;!-- black cross along with the use of `clipPath`  --&gt;
  
   &lt;/svg&gt;
  
  &lt;br&gt;
  &lt;br&gt;
  &lt;br&gt;
  &lt;br&gt;
  </code></pre>
  
  <p>CSS:</p>
  
  <pre><code>svg {
    border: solid 1px grey;
  }
  
  p {
    margin-bottom: 1000px;
  }
  </code></pre>
  
  <p>JS:</p>
  
  <pre><code>// Get the position on the page of the SVG
  var svgLocation = document.getElementById("mysvg").getBoundingClientRect();
  
  // Scroll offset that triggers animation start.
  // In this case it is the bottom of the SVG.
  var offsetToTriggerAnimation = svgLocation.y + svgLocation.height;
  
  // Function to handle the scroll event.
  // Add an event handler to the document for the "onscroll" event
  function scrollAnimTriggerCheck(evt)
  {
    var viewBottom = window.scrollY + window.innerHeight;
    if (viewBottom &gt; offsetToTriggerAnimation) {
      // Start the SMIL animation
      document.getElementById("anim").beginElement();
      // Remove the event handler so it doesn't trigger again
      document.removeEventListener("scroll", scrollAnimTriggerCheck);
    }
  }
  
  // Add an event handler to the document for the "onscroll" event
  document.addEventListener("scroll", scrollAnimTriggerCheck);
  </code></pre>
  
  <p>EDIT:</p>
  
  <p>It works in Firefox and Chrome, thanks to @Scoots!</p>
  
  <p>But now I have problem with IE. I added this code in fakesmile testing ground, because I use fakesmile.js to run animation in IE, but it doesn't work with "scroll function":</p>
  
  <p><a href="https://codepen.io/anon/pen/RQXzYP" rel="nofollow noreferrer">https://codepen.io/anon/pen/RQXzYP</a></p>
  
  <p>But If I delete "scroll function" and set begin 0s instead indefinite it works fine in IE:</p>
  
  <p><a href="https://codepen.io/anon/pen/mxbJgo" rel="nofollow noreferrer">https://codepen.io/anon/pen/mxbJgo</a></p>