Headings HTML

Headings document HTML is <h1>,...<h6>
Important is <h1>,<h2>,<h3>.
<h1> is the best , <h6> is the largest .
Example :
<h1> Headings document HTML is<h1>,...,<h6></h1>
=>Headings document HTML is<h1>,...,<h6>
<h6> Headings document HTML is<h1>,...,<h6></h6>
=> Headings document HTML is<h1>,...,<h6>
Attribute headings document HTML:"align class id style title dir lang xml:lang"