From http://www.w3schools.com (Copyright Refsnes Data)
The attributes listed below are standard and are supported by all HTML 5 tags, with a few exceptions.
New attributes in HTML 5: contenteditable, contextmenu, draggable, irrelevant, ref, registrationmark, and template.
HTML 4.01 attributes which are no longer supported: accesskey.
| Attribute | Value | Description | 4 | 5 |
|---|---|---|---|---|
| acceskey | a character | Sets a keyboard shortcut to access an element. Not supported. | 4 | |
| class | class_rule or style_rule | The class of the element. Used to specify a class in the stylesheet | 4 | 5 |
| contenteditable | true false |
Sets if the user is allowed to edit the content in the element or not | 5 | |
| contentextmenu | id of a menu element | Sets a context menu for an element | 5 | |
| dir | ltr rtl |
Sets the text direction | 4 | 5 |
| draggable | true false auto |
Sets if the user is allowed to drag the element or not | 5 | |
| id | id_name | A unique id for the element. Used with CSS or JavaScript | 4 | 5 |
| irrelevant | true false |
Sets if the element is irrelevant or not. Irrelevant elements is not displayed | 5 | |
| lang | language_code | Sets the language code for the enclosed element | 4 | 5 |
| ref | url or elementID | Refers to another document / another part of the document. Use only if the template attribute is set | 5 | |
| registrationmark | registration mark | Sets a registration mark to an element. Use only on child elements of <rule> (except for the <nest> element) | 5 | |
| style | style_definition | An inline style definition | 4 | 5 |
| tabindex | number | Sets the tab order of an element | 4 | 5 |
| template | url or elementID | Refers to another document / another part of the document that should be applied to this element | 5 | |
| title | tooltip_text | A text to display in a tool tip | 4 | 5 |
From http://www.w3schools.com (Copyright Refsnes Data)