whole_func_string: function isTrackingPixel( image ) {
  	if ( ! image || ! image.src ) {
  		return false;
  	}
  
  	const edgeLength = image.height + image.width;
  	return edgeLength === 1 || edgeLength === 2;
  }
func_code_string: function isTrackingPixel( image ) {
  	if ( ! image || ! image.src ) {
  		return false;
  	}
  
  	const edgeLength = image.height + image.width;
  	return edgeLength === 1 || edgeLength === 2;
  }
func_documentation_string: Checks whether or not an image is a tracking pixel
  @param {Node} image - DOM node for an img
  @returns {boolean} isTrackingPixel - returns true if image is probably a tracking pixel