canvas.toBlob

• Converts a canvas element to a blob and passes it to the callback function5ms ‣

  window.loadImage(
    blob,
    function (canvas) {
      canvasToBlob(canvas, function (newBlob) {
        expect(newBlob).to.be.a.instanceOf(Blob)
        done()
      })
    },
    { canvas: true }
  )

• Converts a canvas element to a PNG blob3ms ‣

  window.loadImage(
    blob,
    function (canvas) {
      canvasToBlob(
        canvas,
        function (newBlob) {
          expect(newBlob.type).to.equal('image/png')
          done()
        },
        'image/png'
      )
    },
    { canvas: true }
  )