HTML Elements
HTML documents are made up by HTML elements.
HTML Elements
HTML elements are written with a start tag, with an end tag, with the content in between:
<tagname>content</tagname>
The HTML element is everything from the start tag to the end tag:
<p>My first HTML paragraph.</p>
| Start tag | Element content | End tag |
|---|---|---|
| <h1> | My First Heading | </h1> |
| <p> | My first paragraph. | </p> |
Nested HTML Elements
HTML elements can be nested (elements can contain elements).All HTML documents consist of nested HTML elements.
This example contains 4 HTML elements:
Example
<!DOCTYPE html>
<html>
<body>
<h1>My First Heading</h1>
<p>My first paragraph.</p>
</body>
</html>
<html>
<body>
<h1>My First Heading</h1>
<p>My first paragraph.</p>
</body>
</html>
HTML Example Explained
The <html> element defines the whole document.It has a start tag <html> and an end tag </html>.
The element content is another HTML element (the <body> element).
<html>
<body>
<h1>My First Heading</h1>
<p>My first paragraph.</p>
</body>
</html>
<body>
<h1>My First Heading</h1>
<p>My first paragraph.</p>
</body>
</html>
It has a start tag <body> and an end tag </body>.
The element content is two other HTML elements (<h1> and <p>).
<body>
<h1>My First Heading</h1>
<p>My first paragraph.</p>
</body>
<h1>My First Heading</h1>
<p>My first paragraph.</p>
</body>
It has a start tag <h1> and an end tag </h1>.
The element content is: My First Heading.
<h1>My First Heading</h1>
It has a start tag <p> and an end tag </p>.
The element content is: My first paragraph.
<p>My first paragraph.</p>
Don't Forget the End Tag
Some HTML elements will display correctly, even if you forget the end tag:Example
<html>
<body>
<p>This is a paragraph
<p>This is a paragraph
</body>
</html>
<body>
<p>This is a paragraph
<p>This is a paragraph
</body>
</html>
Never rely on this. It might produce unexpected results and/or errors if you forget the end tag.
Empty HTML Elements
HTML elements with no content are called empty elements.<br> is an empty element without a closing tag (the <br> tag defines a line break).
Empty elements can be "closed" in the opening tag like this: <br />.
HTML5 does not require empty elements to be closed. But if you want stricter validation, or you need to make your document readable by XML parsers, you should close all HTML elements.
HTML Tip: Use Lowercase Tags
HTML tags are not case sensitive: <P> means the same as <p>.The HTML5 standard does not require lowercase tags, but lowercase can be used in HTML4, and demands lowercase for stricter document types like XHTML.
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