Answer 1

Yes. It have.

Here is an example.

<input type="text" id="myinput" value="readme" onkeydown="readinput()">
<script type="text/javascript">
function readinput(){
alert(myinput.value");
}
</script>

With JavaScript you can access every HTML-attribute you want. You can read the value-attribute of the <input>-Tag too.