JSFiddle - React, Tailwind, and code Playground

JavaScript

let timeout = 10000 - (new Date().getTime() % 10000);
        let tab = Math.random();
        console.log(timeout / 1000, 's timeout, then writing:', tab);


        setTimeout(function() {
            localStorage.setItem('tab', tab);
            console.log(localStorage.getItem('tab'));
            setTimeout(function() {
                console.log(localStorage.getItem('tab'));
                if (JSON.parse(localStorage.getItem('tab')) === tab) {
                    console.log('aquired lock');
                } else {
                    console.log('did not aquire lock');
                }
            }, 1000);
        }, timeout);