JSFiddle - React, Tailwind, and code Playground

HTML

<button onclick="addOne();">Click Me</button>
<input type="text" id="inc" value="0"></input>

<button onclick="resetCookie()">Reset Cookie</button>
<script>
function resetCookie()
{
    document.cookie = 0;
    writeValue();
}
    
function addOne()
{
    document.cookie++;
    writeValue();
}

function writeValue()
{
    document.getElementById('inc').value = document.cookie;
}
    
window.onload = function(){ 
    if(!document.cookie)
    {
        document.cookie = 0;
    }
    writeValue();
} 
</script>