This is true for all tags that affect text. Therefore HTML is called a container tag . You should use the HTML element for each of your web pages. In reality, the HTML element is not required and may safely be omitted. I still continue to use the HTML tags as I like to declare things for what they are and with no ambiguity.
Many elements consist of an opening tag and a closing tag.
An element that has an opening and closing tag is referred to as a container element because anything contained between these tags are affected by the element. Closing Tags cannot be placed just anywhere. Another way of stating this is that the last tag activated must be the first tag terminated. In other words, tags are closed in reverse order to the way they are opened. Thus the first tag opened must be the last tag closed.