HTML Header h1,h2,h3...

This is important tags for structuring your HTML page content. This is used by the Google bots for indexing your page

Usual attributes

Attribute name Attribute value
class Set a value for CSS rules. The CSS rule will be applied to all tags with the same class name
id Set a unique value, it is useful for JavaScript or for CSS rule. For CSS it will be applied only for this tag
style Set a CSS value. It has always priority for general CSS rules. Sample : "background-color:red;color:white"