Make pages interactive with the script element.
✍️ 3 exercises + code challenge in this lessonJavaScript makes HTML pages dynamic and interactive. Add it with the <script> element, either inline or from a file with src="app.js".
A common first step is to find an element with document.getElementById() and change its content or style.
<noscript> shows content only to users who have JavaScript turned off.
Mastering HTML JavaScript helps you write clean and reliable HTML code. Follow standard conventions, test edge cases, and keep logic simple. Try running the code example below and complete the exercises to build confidence.
<p id="clock">Click the button to see the time.</p>
<button onclick="showTime()">What time is it?</button>
<script>
function showTime() {
document.getElementById("clock").innerHTML = "It is " + new Date().toLocaleTimeString();
}
</script>
<noscript>Please enable JavaScript.</noscript>Check what you learned in “HTML JavaScript”.
Insert the element that holds JavaScript code.
<>
document.write('Hi');
</>
Which method finds an element by its id?
Use JavaScript to change the paragraph text to "Changed!".
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