Why is all content shown when accessing svg via "img.svg#white"?

Question

HTML

The code for the svg itself: https://jsfiddle.net/arsu6293/

Answer 1

svg has an element with id white

<g class="white" id="white">
    <polygon points="0,0, 50,100 100,0 100,100 0,100" fill="#fff"/>
  </g>