<!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='https://dummyimage.com/200x200/f50810/fff&text=On'">켜기</button>
<img id="myImage" src="https://dummyimage.com/200x200/000000/fff&text=Off" style="width:100px">
<button onclick="document.getElementById('myImage').src='https://dummyimage.com/200x200/000000/fff&text=Off'">끄기</button>
</body>
</html>
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