Try it Yourself

<!DOCTYPE html>
<html>
<head>
<style>
img {
    width:100%;
}
</style>
</head>
<body>

<p>It is better to use the style attribute (instead of the width and height attributes), because it prevents 
internal or external styles sheets to change the original size of an image:</p>

<img src="/images/html/html5.gif" alt="HTML5 Icon" style="width:128px;height:128px;">
<img src="/images/html/html5.gif" alt="HTML5 Icon" width="128" height="128">

</body>
</html>

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