HTML 5 <!DOCTYPE HTML>

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HTML 5 Outlines

Major HTML5 Feature Groups

3.2.5 Content models

Each element in HTML falls into zero or more categories that group elements with similar characteristics together. The following broad categories are used in this specification:

New HTML 5 Elements

New Markup Elements

New Media Elements

The Canvas Element

New Form Elements

New Input Type Attribute Values

Element Attributes    (List from W3schools)

accesskey
Specifies a keyboard shortcut to access an element.
class
Specifies a classname for an element (used to specify a class in a style sheet).
 contenteditable
Specifies if the user is allowed to edit the content or not.  The contenteditable attribute    Editable Content example
contextmenu
Specifies the context menu for an element.
data-yourvalue
Author defined attributes.Authors of a HTML document can define their own attributes. Must start with "data-".
dir
Specifies the text direction for the content in an element.
draggable
Specifies whether or not a user is allowed to drag an element.
form
HTML5′s New "form" Attribute
hidden
Specifies that the element is not relevant. Hidden elements are not displayed.
id
Specifies a unique id for an element.
item
Used to group elements.
itemprop
Used to group items.
lang
Specifies a language code for the content in an element. Language code reference spellcheck Specifies if the element must have it's spelling or grammar checked.
style
Specifies an inline style for an element.
Scoped: The scoped attribute is a boolean attribute. If present, it indicates that the styles are intended just for the subtree rooted at the style element's parent element, as opposed to the whole Document.
subject
Specifies the element's corresponding item.
tabindex
Specifies the tab order of an element.
title
Specifies extra information about an element.

Server-Sent Events

Web Storage

Widget Packaging and Configuration

Web Workers

Web Storage

Web SQL Database

The WebSocket

Geolocation

Microdata