What is the ( func is not defint line) i dont no pleas tell

Question

Html

Answer 1

It sounds like you accidentally tried to use a function that you haven't written yet.
Can you please link your code?

Answer 2

if u are writing <button class="btn"
onclick="fanc()"><h3> click here</h3>

now you should define the function
U have written that if user Click on Button call a function named func()
but u haven't define the function
How to define : simple
function fanc(){
//do something
}
When user Click on button do something for Example When user Click on button make alert
function fanc(){
alert("hello world :)")
}

Answer 3

Are u mean lambda function but this function exist in programming language like python not Mark up language like HTML