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A header is a text that is placed at the top of a page. It is a text that is separated from the body text and appears at the top of a printed page.
Typically these areas are used for inserting document information, such as the name of the document, the chapter heading, page numbers, and creation date.
Check the link for more details.
Counter:
A counter is a device that stores the number of times a particular event or process has occurred, often in relationship to a clock signal. Counters are used in digital electronics for counting purposes, they can count specific events happening in the circuit. The counter allows a user to increase or decrease a numerical value.
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An image carousel is a container (slideshow) of images or info that users can select by clicking a button that directs them forward or backward in the slideshow. An image carousel makes a website more interactive by enhancing the user experience.
Check the link abx-carousel for more details.
Progress Bar:
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