From http://www.w3schools.com (Copyright Refsnes Data)

HTML 5 <title> tag

Definition and Usage

This element defines the title of the document.

NONE

Note: You can NOT have more then one <title> element in a document.

<html>

<head>
<title>HTML 5 Tag Reference</title>
</head>

<body>
The content of the document......
</body>

</html>

class, contenteditable, contextmenu, dir, draggable, id, irrelevant, lang, ref, registrationmark, tabindex, template, title

For a full description, go to Standard Attributes in HTML 5.