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What Can JavaScript Do?

JavaScript can change HTML attribute values.

In this case JavaScript changes the value of the src (source) attribute of an image.

Turn on the light Turn off the light

onclick="document.getElementById('myImage').src='include/images/pic_bulbon.gif'" - Turn on the light

img id="myImage" src="include/images/pic_bulboff.gif"

onclick="document.getElementById('myImage').src='include/images/pic_bulboff.gif'" - Turn off the light