HTML h1 to h6 tag

From http://www.w3schools.com (Copyright Refsnes Data)

# HTML <h1> to <h6> tags

## Example

The six different HTML headings:

<h1>This is heading 1</h1>
<h2>This is heading 2</h2>
<h3>This is heading 3</h3>
<h4>This is heading 4</h4>
<h5>This is heading 5</h5>
<h6>This is heading 6</h6>

Try it yourself!

## Definition and Usage

The <h1> to <h6> tags are used to define HTML headings.

<h1> defines the largest heading and <h6> defines the smallest heading.

## Browser Support

The <h1> to <h6> tags are supported in all major browsers.

## Differences Between HTML and XHTML

The "align" attribute of the <h1> to <h6> elements was deprecated in HTML 4.01, and is not supported in XHTML 1.0 Strict DTD.

## Optional Attributes

DTD indicates in which DTD the attribute is allowed. S=Strict, T=Transitional, and F=Frameset.

Attribute | Value | Description | DTD
--- | --- | --- | ---
align | left center right justify | Deprecated. Use styles instead. Specifies the alignment of the text in the heading. | TF

## Standard Attributes

id, class, title, style, dir, lang, xml:lang

For a full description, go to Standard Attributes.

## Event Attributes

onclick, ondblclick, onmousedown, onmouseup, onmouseover, onmousemove, onmouseout, onkeypress, onkeydown, onkeyup

For a full description, go to Event Attributes.

From http://www.w3schools.com (Copyright Refsnes Data)