title: Animate stroke-width with Highcharts renderer
body: <p>I'm using Highcharts SVG rendering API (Renderer) to draw custom chart and I want to animate rect's stroke-width attribute. <a href="http://jsfiddle.net/gh/get/jquery/1.7.2/highslide-software/highcharts.com/tree/master/samples/highcharts/members/element-on/" rel="noreferrer">Here is</a> the example provided in Highcharts documentation, but it seems not working properly - all attributes are changed except stroke-width.<br />
  If I open HTML in Chrome DevTools I can see something like that:</p>
  <pre><code>&lt;rect x=&quot;50&quot; y=&quot;50&quot; width=&quot;200&quot; height=&quot;20&quot; rx=&quot;5&quot; ry=&quot;5&quot; stroke=&quot;gray&quot;
  stroke-width=&quot;2&quot; fill=&quot;silver&quot; zIndex=&quot;3&quot; strokeWidth=&quot;10&quot;&gt;&lt;/rect&gt;
  </code></pre>
  <p>Stroke-width is set using camel-style name, not dash-style name.</p>
  <p>May be there is some workaround?</p>