Quiz: what does this HTML file display when rendered?

quiz.html

<script>
<!--
//<script></script> not displayed
-->
//<script></script> displayed
</script>
<br />
<script>
<!--
var a,b;
//<script></script> not displayed
a-- >b;
//<script></script> not displayed
a-->b;
//</script> displayed
</script>
<br />
<script>
<!--
//<script><script></script></script> displayed
</script>

Also:

typeof (function(a) {
  return 1<!--a;
}(2))