changeText.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Change text using JS</title>
</head>
<body>
    <h2>Hello, Change <abbr title="HyperText Markup Language">HTML</abbr> text by Using <abbr title="JavaScript">JS</abbr></h2>
    <p id="para">This is the original text in <abbr title="Hyper Text Markup Language">HTML</abbr></p>
    <button id="btn" onClick="changeText();">Click Me</button>


    <script>
        let text = document.querySelector('#para');
        let bton = document.querySelector('#btn')

        function changeText() {
            if(bton.innerHTML === "Click Me") {
                text.innerHTML = "This is the changed text using <abbr title='JavaScript'>JS</abbr>.";

                bton.innerHTML  = "Reset";
            }

            else {
                text.innerHTML = "This is the original text in <abbr title='Hyper Text Markup Language'>HTML</abbr>";

                bton.innerHTML = "Click Me"
            }
        }
    </script>
</body>
</html>