How can i integre javascript with html5

Question

i want to know how to add javascripte code to html5(for exemple flipClock)

Answer 1

<script src"source" type="text/javascript">//script</script>

Answer 2

Embedded:
<script>
console.log("Thats JS");
</script>

Extern:
<script src="path"></script>

The attribute type and language are optional, because JS is the standard script by your browser.

The script can also be used for PHP. Let me show you:
<script language="php">
echo "Thats PHP";
</script>