<title>Html Test</title>
<style>
button
{
background: red;
color:white;
border: none;
padding:10px;
border-radius:10px;
}
</style>
Button1
Button2
<script>
console.log("Hello");
setTimeout(function()
{
document.getElementById("btn").innerHTML = "Button3";
}
,2000);
</script>