The only required XHTML attributes for the <img /> tag are "src" and "alt", but you are
strongly encouraged to also use the "width" and "height" attributes. Width and height are measured
in units called "pixels" which are each equal to one graphic point on the screen.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>Virtual Fish Tank</title>
</head>
<body bgcolor="#bdbdbd" text="white" link="blue" vlink="purple">
<b>
<center>
<font size="+2">My Virtual Fish Tank</font><br />
<font color="red">
<i>Please do not feed the fish. Thanks! </i>
</font>
<br />
<img src="images/aquarium.gif" width="256" height="256"
alt="Aquarium" />
<br />
</center>
</b>
</body>
</html>
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