HTML5 attributes are case insensitive and may be written in all uppercase or mixed case, although the most common convention is to stick with lowercase.
The attributes listed below are supported by almost all the HTML 5 tags.
| Attribute Keyword | Optional Values | Description |
|---|---|---|
| accesskey | User Defined | Specifies a keyboard shortcut to access an element. |
| align | right, left, center | Horizontally aligns tags |
| class | User Defined | Classifies an element for use with Cascading Style Sheets. |
| contenteditable | true, false | Specifies if the user can edit the element’s content or not. |
| contextmenu | Menu id | Specifies the context menu for an element. |
| data-XXXX | User Defined | Custom attributes. Authors of a HTML document can define their own attributes. Must start with “data-“. |
| draggable | true,false, auto | Specifies whether or not a user is allowed to drag an element. |
| height | Numeric Value | Specifies the height of tables, images, or table cells. |
| hidden | hidden | Specifies whether element should be visible or not. |
| id | User Defined | Names an element for use with Cascading Style Sheets. |
| item | List of elements | Used to group elements. |
| itemprop | List of items | Used to group items. |
| spellcheck | true, false | Specifies if the element must have it’s spelling or grammar checked. |
| style | CSS Style sheet | Specifies an inline style for an element. |
| subject | User define id | Specifies the element’s corresponding item. |
| tabindex | Tab number | Specifies the tab order of an element. |
| background | URL | Places an background image behind an element |
| bgcolor | numeric, hexidecimal, RGB values | Places a background color behind an element |
| title | User Defined | “Pop-up” title for your elements. |
| valign | top, middle, bottom | Vertically aligns tags within an HTML element. |
| width | Numeric Value | Specifies the width of tables, images, or table cells. |
