JSFiddle - React, Tailwind, and code Playground

HTML

<iframe id="yt" name="yt" width="720" height="405" src="https://www.youtube.com/embed/M7lc1UVf-VE" frameborder="0" allowfullscreen></iframe>

<br><br>

<div id="bookmarkBoto">bookmarkBoto</div>
<div id="check">check</div>

JavaScript

$("#bookmarkBoto").click(function() {
		
	//var time = $("#yt").currentTime();//no
	//var time = $("#yt").getCurrentTime();//no	
	var time = $("#yt").get(0).getCurrentTime();        
   	
    $('#check').text(time);
		
});