text: export class StyleSheet {
  	constructor() {
  		this.top = null;
  		this.left = null;
  		this.right = null;
  		this.bottom = null;
  		this.height = null;
  		this.width = null;
  	}
  }
  
  export const STYLE_ATTRIBUTE_NAME_LIST = [
  	'top', 'left', 'right', 'bottom',
  	'height', 'width'
  ];
  