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<!DOCTYPE html>
<html>
<body>
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<h2>What Can JavaScript Do?</h2>
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<p>JavaScript can change HTML attribute values.</p>
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<p>In this case JavaScript changes the value of the src (source) attribute of an image.</p>
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<button onclick="document.getElementById('myImage').src='pic_bulbon.gif'">Turn on the light</button>
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<img id="myImage" src="pic_bulboff.gif" style="width:100px">
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<button onclick="document.getElementById('myImage').src='pic_bulboff.gif'">Turn off the light</button>
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</body>
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<!-- Mirrored from www.w3schools.com/js/tryit.asp?filename=tryjs_intro_lightbulb by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 02:28:11 GMT -->
</html>
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