Reference01
Complete HTML attribute applicability index
Find current HTML attributes, their permitted host elements, and exact specification definitions, with guidance on states and browser support.
THE HTML LEARNING LIBRARY
HTML attribute reference
Find the syntax, attributes, constraints, and accessibility details you need.
15 resources to explore
15 on this page
Reference02
Identity and application data: id, class, and data-*
Id gives an element a unique identifier in its tree.
Reference03
Inline presentation and policy: style, title, and nonce
Style attaches CSS declarations to an element.
Reference04
ARIA attributes: names, relationships, states, and announcements
ARIA adds accessibility semantics when native HTML alone does not express the necessary relationship or state.
Reference05
Language and translation: lang, dir, and translate
Lang identifies the language of content using a language tag.
Reference06
Microdata: itemscope, itemtype, itemprop, itemid, and itemref
Microdata annotates visible HTML with machine-readable items and properties.
Reference07
Experimental implementation: headingoffset and headingreset
Headingoffset and headingreset address computed heading levels, particularly in reusable component structures.
Reference08
Visibility and interaction: hidden and inert
Compare hidden and inert, including presentation, focus, and accessibility implications. Learn when each state fits an interface.
Reference09
Component attributes: slot, part, exportparts, and is
Slot assigns a light-DOM element to a named distribution point inside a shadow tree.
Reference10
Focus attributes: tabindex, autofocus, and accesskey
Tabindex affects whether and where an element participates in sequential focus navigation.
Reference11
Event handlers and draggable behavior
HTML event-handler attributes connect events to inline script, while the DOM addEventListener API attaches listeners through JavaScript.
Reference12
Editing hints: contenteditable, spellcheck, and input assistance
Contenteditable makes an element's contents editable.
Reference13
Form constraints: required, pattern, min, max, step, and length
Constraint attributes describe browser-side validity rules for applicable form controls.
Reference14
Popover controls: popover, popovertarget, and popovertargetaction
Popover marks content that can be displayed in the browser's top layer.
Reference15
Fetching attributes: crossorigin, referrerpolicy, integrity, and loading
Resource-loading attributes influence how a browser fetches or prioritizes a resource.
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