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Complete CSS Selector Reference Manual
For id="my-id" element adds the specified style:
<!DOCTYPE html>
<html>
<title>Basic Tutorial Website (oldtoolbag.com)</title>/title>
<head>
<style>
#my-id
{
background-color:red;
}
</style>
</head>
<body>
<h1>Welcome to my homepage</h1>
<div id="my-id">
<p>My name is Rabbit Baby.</p>/p>
<p>I live in Canada.</p>/p>
</div>
<p>My best friend is Lili.</p>/p>
</body>
</html>Test and see ‹/›#idThe selector specifies the style of elements with ID attributes.
IEFirefoxOperaChromeSafari
All mainstream browsers support #id Selector.