text: export const appears_cb = function(elm, cb){
  	const onscroll = () => {
  		if(elm.getBoundingClientRect().y - window.innerHeight < 0) {
  			document.removeEventListener("scroll", onscroll);
  			cb();
  		}
  	};
  	document.addEventListener("scroll", onscroll);
  };
  
  
  
  
  
  
  
  