HTML
Id
An id is an attribute used to specify a unique id for an HTML element. An ID selector is a name preceded by a hash character (“#”).
Id Breakdown
Here is the breakdown of HTML Id
Id Example
Below example will demonstrate the basic architecture of HTML Id.
<!doctype html>
<html>
<head>
<title>ID Example</title>
<style>
#top {
background-color: #ccc;
padding: 20px
}
</style>
</head>
<body>
<div id="top">
<h1>PHPDocs</h1>
</div>
</body>
</html>