The head element is the next major section of your document after the version information. The head contains meta information about the document. In the HEAD, HTML 4.0 defines that you must supply a document title. In addition, you can optional specify extra meta information such as keywords for search engines, link relationships, style sheets for defining the rendering, and scripts for defining the behavior.
In general, the document's head is not rendered as content in the document, but many browsers make this information available in other ways. For example, the TITLE is usually rendered in the titlebar on windowed systems, and all the contents in the HEAD are available through the document object model.
The title element identifies the contents of the page and is usually displayed in the titlebar of the document's window. A valid HTML document must always contain a title. You can customize this document's title by entering a new title. As you type notice that the title in your window is being updated (not all browsers allow the title to dynamically change):
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