Re: Dump frame tree in real time

Tue, 19 Apr 2016 06:51:16 -0700 

On 19/04/2016 14:41, Jip de Beer wrote:

I followed your steps exactly and uses this code to add a canvas on a page with 
jQuery:

     var myCanvas = document.createElement('canvas');
     var width = $(document).width()
     myCanvas.width = width;
     var height = $(document).height()
     myCanvas.height = height;
     var ctx = myCanvas.getContext("2d");
     ctx.drawWindow(window, 0, 0, width, height, "rgba(0, 0, 0, 0)");
     console.log(myCanvas.toDataURL());

Result:
TypeError: ctx.drawWindow is not a function

I'm currently trying to figure out how to make Firefox render the entire page 
the whole time.
drawWindow is a privileged API and you would need to use an add-on or Firefox code to call it: https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/drawWindow 

~ Gijs

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