Why does the html input with type “number” allow t

Question

I have the following html5 input element:

<input type="number">

Why does this input allow for the character 'e' to be entered in the input field? No other alphabet character is able to be entered (as expected)

Using chrome v. 44.0.2403.107

To see what I mean: http://www.w3schools.com/html/tryit.asp?filename=tryhtml_input_number

Answer 1

<input type="number" onkeydown="return FilterInput(event)" onpaste="handlePaste(event)"  >

function FilterInput(event) {
    var keyCode = ('which' in event) ? event.which : event.keyCode;

    isNotWanted = (keyCode == 69 || keyCode == 101);
    return !isNotWanted;
};
function handlePaste (e) {
    var clipboardData, pastedData;

    // Get pasted data via clipboard API
    clipboardData = e.clipboardData || window.clipboardData;
    pastedData = clipboardData.getData('Text').toUpperCase();

    if(pastedData.indexOf('E')>-1) {
        //alert('found an E');
        e.stopPropagation();
        e.preventDefault();
    }
};

Answer 2

HTML input number type allows "e/E" because "e" stands for exponential which is a numeric symbol.

Example 200000 can also be written as 2e5. I hope this helps thank you for the question.　　　　　　　　　　

Answer 3

We can make it So simple like below

<input type="number"  onkeydown="javascript: return event.keyCode == 69 ? false : true" />

Answer 4

Because that's exactly how the spec says it should work. The number input can accept floating point numbers, including negative symbols and the e or E character:

A floating-point number consists of the following parts, in exactly the following order:

1. Optionally, the first character may be a "-" character.
2. One or more characters in the range "0—9".
3. Optionally, the following parts, in exactly the following order:
   1. a "." character
   2. one or more characters in the range "0—9"
4. Optionally, the following parts, in exactly the following order:
   1. a "e" character or "E" character
   2. optionally, a "-" character or "+" character
   3. One or more characters in the range "0—9".