JSFiddle - React, Tailwind, and code Playground

HTML

<input type="button" class="chrono"/>
<input type="button" class="chrono"/>
<input type="button" class="chrono"/>
<input type="button" class="chrono"/>
<input type="button" class="chrono"/>
<input type="button" class="chrono"/>
<input type="button" class="chrono"/>
<input type="button" class="chrono"/>
<input type="button" class="chrono"/>
<input type="button" class="chrono"/>
<input type="button" class="chrono"/>
<input type="button" class="chrono"/>
<input type="button" class="chrono"/>
<input type="button" class="chrono"/>
<input type="button" class="chrono"/>
<input type="button" class="chrono"/>
<input type="button" class="chrono"/>
<input type="button" class="chrono"/>
<input type="button" class="chrono"/>
<input type="button" class="chrono"/>

JavaScript

$.fn.extend({
    chrono:function(){
        return this.each(function(){ 
            var t=$(this),
                that=this,
                time,
                paused,
                running,
                update=function(curr,force){
                    if(running||force){
                        var milli=paused=curr-time,
                            second=Math.floor(milli/1000);
                        milli-=second*1000,
                        that.value=second+'s '+milli;
                        setTimeout(function(){update(new Date().getTime())},20)
                    }
                },
                stop=function(){
                    running=false,
                    update(time=0,true)
                },
                pause=function(){
                    running=false                             
                },
                play=function(){
                    var curr=new Date().getTime();
                    time=curr-paused,
                    running=true,  
                    update(curr)  
                };
            t.on('click',function(){if(running)pause();else play()}).on('dblclick',stop),
            stop()
        })
    }
}),                                                         
$('.chrono').chrono()