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<!DOCTYPE html> <html> <body> <h2>What Can JavaScript Do?</h2> <p>JavaScript can change HTML attribute values.</p> <p>In this case JavaScript changes the value of the src (source) attribute of an image.</p> <button onclick="document.getElementById('myImage').src='img_bulbon.gif'">Turn on the light</button> <img id="myImage" src="img_bulboff.gif" style="width:100px"> <button onclick="document.getElementById('myImage').src='img_bulboff.gif'">Turn off the light</button> </body> </html>
