HTML elements can be nested (this means that elements can contain other elements).
All HTML documents consist of nested HTML elements.
The following example contains four HTML elements (<html>, <body>, <h1> and <p>):
<html>
<body>
<h1>
<p>
<!DOCTYPE html>
<h1>My First Heading</h1>
<p>My first paragraph.</p>
</body>
</html>
The <html> element is the root element and it defines the whole HTML document.
It has a start tag <html> and an end tag </html>.
Then, inside the <html> element there is a <body> element
The <body> element defines the document's body.
It has a start tag <body> and an end tag </body>.
Then, inside the <body> element there are two other elements: <h1> and <p>
The <h1> element defines a heading.
It has a start tag <h1> and an end tag </h1>
</h1>
The <p> element defines a paragraph.
It has a start tag <p> and an end tag </p>
</p>
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