> For the complete documentation index, see [llms.txt](https://codingzonebd.gitbook.io/html-elements/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://codingzonebd.gitbook.io/html-elements/what-is-an-html-element.md).
# What is an HTML Element?
An HTML element is defined by a start tag, some content, and an end tag:
{% code overflow="wrap" lineNumbers="true" %}
```html
Content goes here...
```
{% endcode %}
The HTML **element** is everything from the start tag to the end tag:
{% code overflow="wrap" lineNumbers="true" %}
```html
My First Heading
My first paragraph.
```
{% endcode %}
### HTML Page Structure
Below is a visualization of an HTML page structure:
## HTML Elements
{% code overflow="wrap" lineNumbers="true" %}
```html
Content goes here...
My First Heading
My first paragraph.
This is a paragraph with a line break.
```
{% endcode %}
### Nested HTML Elements
{% code overflow="wrap" lineNumbers="true" %}
```markup
My First Heading
My first paragraph.
```
{% endcode %}
**The ****\**** Declaration**
**The \ declaration represents the document type, and helps browsers to display web pages correctly.**
**It must only appear once, at the top of the page (before any HTML tags).**
**The \ declaration is not case-sensitive.**
**The \ declaration for HTML5 is:**
{% code overflow="wrap" lineNumbers="true" %}
```html
```
{% endcode %}
**HTML Headings**
{% code overflow="wrap" lineNumbers="true" %}
```markup
