why type="number" accepting 'e' character?

Question

can anybody here explain why input type=number accepts e character? it really confuses me and i'm wondering about it .

Answer 1

Because in addition to the letter e, there is also a number e (which represents exponents).

If you really want to exclude these, you can prevent them by targetting character code 69, and preventing the default behaviour for the keypress event with preventDefault() if the character is entered:

document.querySelector("input").addEventListener("keydown", function(event) {
  if (event.which === 69) {
    event.preventDefault();
  }
});

<input type="number">

EDIT Modified the event and the condition to event.preventDefault().

Answer 2

e is the exponent. This allows a user to enter a number such as 4e3, which means 4×10³.

Try entering 4e3 in the box, and then press the up step button: in Chrome this will change to show 4001