A set of buttons that are styled like standard Salesforce buttons. This component must be a child
component of an <apex:pageBlock>.
Note that it is not necessary for the buttons themselves to be direct children of the
<apex:pageBlockButtons> component—buttons that are located at any level within an
<apex:pageBlockButtons> component are styled appropriately.

A section of a Visualforce page that allows users to enter input and then submit it with an
<apex:commandButton> or <apex:commandLink>. The body of the form determines the data that
is displayed and the way it is processed. It’s a best practice to verify that pages and custom
components use at most one <apex:form> tag.
As of API version 18.0, this tag can’t be a child component of <apex:repeat>.

A single Visualforce page. All pages must be wrapped inside a single page component tag.

An HTML input element of type password. Use this component to get user input for a controller
method that does not correspond to a field on a Salesforce object, for a value that is masked as
the user types.

An area of a page that uses styling similar to the appearance of a Salesforce detail page, but
without any default content.