JSFiddle - React, Tailwind, and code Playground
HTML
<input type="text" value="start">
<div></div>
JavaScript
$('input').prop('value', '123');
var len1 = $("input[value='start']").length;
var len2 = $("input[value='123']").length;
$("div").html("attr selector[value='xxxx']: " + len1 + "<br/>attr selector[value='123']: " + len2);