Why is the META tag used?

You may be wondering why some variables are "declared" with a "meta" tag. The meta tag is used for elements that need not be displayed in the HTML page. Since <meta> elements are nonvisual, no special tricks are needed to hide meta elements from the visual part of the document.

One exception is the IS_CommandToolbar_Visible meta tag. It allows a script to control whether or not the command toolbar is visible. To display the toolbar, include this meta tag in the head section of a page:

<meta name="IS_CommandToolbar_Visible" content="true">

To hide the toolbar:

<meta name="IS_CommandToolbar_Visible" content="false">