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<!DOCTYPE html>
<html>
<head>
<style>
p::before {
  content: url(w3css.gif);
}
span::before {
  content: inherit;
}
</style>
</head>
<body>
<p>My name is <span id="firstname">Donald</span></p>
<p>I live in <span>Ducksburg</span></p>
</body>
</html>