What is an html element?
Html elements are defined by a start tag, some have content in-between the tags and an end tag.
Other elements don't have an end tag they usually have a slash "/" inside the start tag like this one <br/>, and other tags don't have a slash inside they have a start tag only.Those elemets don't need an end tag like this one <hr> and they do not contain any text or child elements.
This html elements are called empty elements because they do not have an end tag and any type of content.Let's look at some examples that are ordered alphabetically...
A
B