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What methods can I use to retrieve the 3 HTML elements annotated as<!-- to retrieve -->
in this HTML document?
<! DOCTYPE html>
<html lang="en">
<head>
<title>QCM JavaScript</title>
</head>
<body>
<div id="foo">
<span class="bar">Foo bar</span><!-- to retrieve -->
<span class="baz">Foo baz</span>
<span class="bar baz">Foo bar baz</span><!-- to retrieve -->
</div>
<div id="quux">
<div class="bar">Foo bar</div><!-- to retrieve -->
<div class="baz">Foo baz</div>
</div>
</body>
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