Uncaught SyntaxError: Unexpected token '<' - form tag and onclick - forms

Question

I am a newbie to javascript and am following an old tutorial from 2013 in German.
I wonder if certain commands and codes are now deprecated as I have tried to make this code work in an external javascript file.
function clicked() {
alert("can't you read?");
}
<form>
<input onclick="clicked()" type ="button" value = "don't click"/>
</form>
I get an error message which states:
Uncaught SyntaxError: Unexpected token '<'
I get the same error message when I try this code instead,
<button onclick="clicked()" type="button">"don't click"</button>
I tried to find solutions online, but it appears as if the javascript-verse has evolved to more complicated looking solutions.
Can someone help?
Thanks,
"

Answer 1

I actually figured it out by finding a reference from 2008.
Anything between the form tags and including the form tags goes into the html file.
<form>
<input onclick="clicked()" type ="button" value = "don't click"/>
</form>
The function itself remains on the external javascript file
function clicked() {
alert("can't you read?");
}
The solution looks definitely simpler than all other onsubmit or onclick codes I have seen today. I therefore assume that I may miss some tricks by being overly simplistic.