JavaScript onkeypress does not call function

Actually your markup is right but the function name checkValidity is now an internal keyword for elements

Check here https://developer.mozilla.org/en-US/docs/Web/API/HTMLSelectElement/checkValidity

You can change the name of the function thats all

<html>
    <script>
        function checkMyValidity() {
            alert("Checking...");
        }
    </script>
    <body>
        <input type="text" name="username" id="username" onkeypress="checkMyValidity()">
    </body>
</html>
Answer:1

checkValidity is Javascript's form validation method. Change the method name. Then it will work.

Answer:2

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