examples/worker.html

<!doctype html>
<title>Worker</title>

<script>
"use strict";

window.onload = function()
{
    var worker = new Worker("worker.js");
    var terminal = document.getElementById("terminal");

    worker.onmessage = function(e)
    {
        terminal.textContent += e.data;
    }

    terminal.onkeypress = function(e)
    {
        e.preventDefault();
        worker.postMessage(String.fromCharCode(e.which));
    };
}

var start = Date.now();
setInterval(function()
{
    document.getElementById("time").textContent = (Date.now() - start) / 1000 | 0;
});
</script>

<span id=time></span>s
<hr>
<textarea rows=25 cols=80 id=terminal></textarea>