The title element in the head section should be non-empty. All HTML and XHTML documents, including those in individual frames in a frameset, should have a title element in the head section that defines in a simple phrase the purpose of the document.
Engine scans for empty
<title> element inside the document
A descriptive document title allows users to quickly and easily identify whether the information contained in the Web page is relevant to their needs
<title>The World Wide Web Consortium</title>