An HTML file is made of many several elements. These elements are responsible for creating web pages and defining content on that webpage. These elements have a start tag <tag Name> and an ending tag</tag Name>.
For example,
<p> An example for Html element. </p>Some elements do not have both starting and ending tag such as,
<br>
Nested Elements
In Html, many elements can be nested inside other elements. For example,
<!Doctype html>
<html>
<body>
<p> Hello User. </p>
</body>
</html>Here <body> tag is nested inside <html> tag and <p> tag is nested inside <body> tag.
Empty Tags
There are some Empty tags also for which the ending tag is not required and there is no content in them. For example,
<br> tag – It defines a line break.
Html is not Case sensitive,
It will not create a problem if the case of Html tag is changed.
<p> Hello.</p>
<P> Hello.</p>