JSFiddle - React, Tailwind, and code Playground

HTML

<div class="test"></div>

JavaScript

$(function(){
  var d = $('div.test');

  d.data('to-shoot', 1);

  alert($('div[data-to-shoot=1]').length);
  
  d.attr('data-to-shoot', 1);
    
  alert($('div[data-to-shoot=1]').length);
    
  var divs = $('div').filter(function(){
    return $(this).data('to-shoot') == 1; 
  });
    
  alert(divs.length);
});