JSFiddle - React, Tailwind, and code Playground

HTML

<form action="act_vowel.php" method="post" id="form">
     <h2> <font color = "black">  Type the word: </font> </h2> 
    <input type="text" name="word" />
    <input type="submit" name="check" value="Answer" />
</form>

JavaScript

var form = document.getElementById("form");
form.onsubmit = function () {
    if (document.getElementsByName("word")[0].value.toLowerCase() == 'ship') {
        alert('Your answer is correct.');
    } else {
        alert('Sorry, you typed the wrong answer. Try Again!');
        return false;
    }
}