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In your <head> tag, add:
<title>My Epic Title Name</title>
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<head>
<title>My page title</title>
</head>
<script>
document.title = "My new title";
</script>
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/*Title popup*/
<body>
<p title="Popup here">hover me!</p>
</body>
/*Tab title*/
<head>
<title>This is the tab title</title>
</head>
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<html>
<head>
</head>
<body>
<a href="google.com" title="Click to go to google page">
Hover to understand
</a>
</body>
<html>