<h1-7>

Places a heading onto your document. Heading tags automatically place a page break before and after the closing and opening tags.

Attribute Description
align Horizontally align various tags or content.
class Classify or name your elements. For instance, if you classify several paragraph elements the same name, using CSS it is possible to give them all the same styles in one line of code.
id Specify an ID for your elements.
lang Define the language to display your element in. Here's a link to the abbreviations of languages. http://www.oasis-open.org/cover/iso639a.html
style Used to create inline styles such as CSS.
title Places a "pop-up" title for an element upon mouse over. Similar to "help" pop-ups in word programs.
valign Vertically align an element.

Code:

<h1 class="heading">Headings go smaller</h1>
<h2 class="heading">smaller</h2>
<h3 class="heading">smaller</h3>
<h7 class="heading">and smaller</h7>

Display:

Headings go smaller

smaller

smaller

and smaller