code: function( buffer, enFamilyName, noMerge) {
  			//cancelling in browser merge
  			clearTimeout(this.mergeTimeout);
  
  			if ( !enFamilyName ) {
  				enFamilyName = this.ot.getEnglishName('fontFamily');
  			}
  
  			if ( this.fontMap[ enFamilyName ] ) {
  				document.fonts.delete( this.fontMap[ enFamilyName ] );
  			}
  
  			var fontface = this.fontMap[ enFamilyName ] = (
  				new window.FontFace(
  					enFamilyName,
  					buffer || this.toArrayBuffer()
  				)
  			);
  
  			if ( fontface.status === 'error' ) {
  				throw new Error('Fontface is invalid and cannot be displayed');
  			}
  
  			document.fonts.add( fontface );
  
  			//we merge font that haven't been merge
  			if ( !noMerge ) {
  				var timeoutRef = this.mergeTimeout = setTimeout(function() {
  				mergeFont(
  					'https://merge.prototypo.io',
  					{
  						style: 'forbrowserdisplay',
  						template: 'noidea',
  						family: 'forbrowserdisplay'
  					},
  					'plumin',
  					buffer,
  					true,
  					function(mergedBuffer) {
  						if (timeoutRef === this.mergeTimeout) {
  							this.addToFonts(mergedBuffer, enFamilyName, true);
  						}
  					}.bind(this)
  				);
  				}.bind(this), 300);
  			}
  
  			return this;
  		}
docs: CSS font loading, lightning fast