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<!DOCTYPE html>
<html>
<head>
<style>
#img1 {
  filter: opacity(80%);
}
#img2 {
  filter: opacity(50%);
}
#img3 {
  filter: opacity(0.2);
}
</style>
</head>
<body>
<h1>The opacity() Function</h1>
<p>opacity(80%):</p>
<img id="img1" src="pineapple.jpg" alt="Pineapple" width="300" height="300">
<p>opacity(50%):</p>
<img id="img2" src="pineapple.jpg" alt="Pineapple" width="300" height="300">
<p>opacity(0.2):</p>
<img id="img3" src="pineapple.jpg" alt="Pineapple" width="300" height="300">
<p>Original image:</p>
<img src="pineapple.jpg" alt="Pineapple" width="300" height="300">
</body>
</html>