Captures angeriness as WebM/VP9 video (updated canvas size for new reacts)

get_angery.js

//beforehand, hover the reaction's pop-up and keep it in focus while recording
function make_canvas_recorder(canvas, filename)
{
	var chunks;
	var recorder = new MediaRecorder(canvas.captureStream(), {'mimeType' : 'video/webm;codecs=vp9', 'videoBitsPerSecond' : 1e10});
	recorder.ondataavailable = function(e){chunks.push(e.data);};
	recorder.onstart = function(e){chunks = [];};
	recorder.onstop = function(e)
	{
		var a = document.createElement('a');
		a.href = URL.createObjectURL(new Blob(chunks, {'type' : 'video/webm'}));
		a.download = filename;
		a.click();
	};
	return recorder;
}

cnv = document.querySelector('[data-reaction="8"] canvas');
cnv.width = cnv.height = 180;
cnv.removeAttribute('style');

rec = make_canvas_recorder(cnv, 'angery.webm');
rec.start();
setTimeout(function(){rec.stop();}, 10000);