title: Transparent blurred background to Canvas
body: <p>No idea how to create transparent blurred background to canvas <strong>without bluring the canvas childrens</strong> too.</p>
  
  <p>This is the result I want - Blur the background but not the content:
  <img src="https://i.stack.imgur.com/FqIxB.jpg" alt="how I do that"></p>