JSFiddle - React, Tailwind, and code Playground

HTML

<div></div>

JavaScript

console.log(document.querySelectorAll('div[x~="a b"]'));
//console.log(document.querySelectorAll('div[x~=a b]'));
console.log($("div").is('div[x~="a b"]'));
console.log($("div").is('div[x~=a b]'));
console.log($('div[x~="a b"]'));
//console.log($('div[x~=a b]'));