public Track(HtmlMidNode parent, HtmlAttributeToken[] attrs){
		super(parent, attrs);

		for(HtmlAttributeToken attr:attrs){
			String v = attr.getAttrValue();
			switch(attr.getAttrName()){
				case "default":
					defaultt = Default.parse(this, v);
					break;
				case "kind":
					kind = Kind.parse(this, v);
					break;
				case "label":
					label = Label.parse(this, v);
					break;
				case "src":
					src = Src.parse(this, v);
					break;
				case "srclang":
					srclang = Srclang.parse(this, v);
					break;
			}
		}
	}