JSFiddle - React, Tailwind, and code Playground

HTML

<html>
    <head>
        <base href="" id='base1' />
     </head>
</html>

JavaScript

console.log(document.baseURI);
history.pushState('', '', 'foo/');
console.log(document.baseURI);

document.getElementById('base1').href='';
console.log(document.baseURI);