JSFiddle - React, Tailwind, and code Playground
HTML
<input type="text" value="asjkhas ajs" readonly />
JavaScript
$('input').focus(function(){
$(this).select();
var _self = this;
setTimeout(function(){
if('selectionStart' in _self )
{
console.log(_self.selectionStart, _self.selectionEnd);
}
//IE
else if(document.selection)
{
console.log(document.selection);
}
},1000);
})