Attribute index
Global attributes
The 31 attributes the WHATWG attribute index lists for all HTML elements. Event handler attributes
(onclick and the rest) have their own index in the standard.
accesskey- Keyboard shortcut to activate or focus element Value: Ordered set of unique space-separated tokens, none of which are identical to another, each consisting of one code point in length
autocapitalize- Recommended autocapitalization behavior (for supported input methods) Value: "
on"; "off"; "none"; "sentences"; "words"; "characters" autocorrect- Recommended autocorrection behavior (for supported input methods) Value: "
on"; "off"; the empty string autofocus- Automatically focus the element when the page is loaded Value: Boolean attribute
class- Classes to which the element belongs Value: Set of space-separated tokens
contenteditable- Whether the element is editable Value: "
true"; "false"; "plaintext-only"; the empty string dir- The text directionality of the element Value: "
ltr"; "rtl"; "auto" draggable- Whether the element is draggable Value: "
true"; "false" enterkeyhint- Hint for selecting an enter key action Value: "
enter"; "done"; "go"; "next"; "previous"; "search"; "send" headingoffset- Offsets heading levels for descendants Value: Valid non-negative integer between 0 and 8
headingreset- Prevents a heading offset computation from traversing beyond the element with the attribute Value: Boolean attribute
inert- Whether the element is inert. Value: Boolean attribute
inputmode- Hint for selecting an input modality Value: "
none"; "text"; "tel"; "email"; "url"; "numeric"; "decimal"; "search" is- Creates a customized built-in element Value: Valid custom element name of a defined customized built-in element
itemid- Global identifier for a microdata item Value: Valid URL potentially surrounded by spaces
itemprop- Property names of a microdata item Value: Unordered set of unique space-separated tokens consisting of valid absolute URLs, defined property names, or text*
itemref- Referenced elements Value: Unordered set of unique space-separated tokens consisting of IDs*
itemscope- Introduces a microdata item Value: Boolean attribute
itemtype- Item types of a microdata item Value: Unordered set of unique space-separated tokens consisting of valid absolute URLs*
lang- Language of the element Value: Valid BCP 47 language tag or the empty string
slot- The element's desired slot Value: Text
spellcheck- Whether the element is to have its spelling and grammar checked Value: "
true"; "false"; the empty string style- Presentational and formatting instructions Value: CSS declarations*
tabindex- Whether the element is focusable and sequentially focusable, and the relative order of the element for the purposes of sequential focus navigation Value: Valid integer
title- Advisory information for the element Value: Text
translate- Whether the element is to be translated when the page is localized Value: "
yes"; "no"; the empty string