HTML Attributes

Common HTML attributes, the elements they apply to, and what they do.

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Attribute	Applies to	Description
alt	img, area, input	Alternative text for an image, for people who cannot see it.
href	a, area, link, base	The address a link points to.
src	img, script, audio, video, iframe, source	The address of an external file: image, script, media.
id	all elements	A unique identifier for an element.
class	all elements	One or more class names, for CSS and JavaScript.
style	all elements	Inline CSS for one element.
title	all elements	Extra information, shown as a tooltip.
lang	all elements	The language of the content.
hidden	all elements	Hides an element.
tabindex	all elements	Controls the keyboard tab order.
contenteditable	all elements	Makes content editable by the user.
draggable	all elements	Whether an element can be dragged.
data-*	all elements	Custom data stored on an element.
target	a, form, area	Where to open a link.
rel	a, link	Relationship of the linked file to this page.
download	a, area	Downloads the linked file instead of opening it.
width	img, canvas, video, iframe, table	The width of an element.
height	img, canvas, video, iframe	The height of an element.
loading	img, iframe	Lazy-load images or iframes.
controls	audio, video	Shows playback controls.
autoplay	audio, video	Starts playing automatically.
loop	audio, video	Repeats the media.
type	input, button, script, source	The type of an input or a file.
name	input, select, textarea, button, form	The name of a form field, sent with the form.
value	input, button, option, li	The value of a form control.
placeholder	input, textarea	A hint shown in an empty field.
required	input, select, textarea	The field must be filled in.
disabled	input, button, select, textarea	Disables a control.
readonly	input, textarea	The value cannot be edited.
checked	input	Pre-selects a checkbox or radio button.
selected	option	Pre-selects an option.
multiple	input, select	Allows several values.
maxlength	input, textarea	The maximum number of characters.
min	input, meter, progress	The minimum value.
max	input, meter, progress	The maximum value.
step	input	The step between valid numbers.
pattern	input	A regular expression the value must match.
autofocus	input, button, select, textarea	Focuses the element when the page loads.
autocomplete	input, form, select, textarea	Lets the browser fill the field in.
for	label, output	Connects a label to a control by id.
action	form	Where a form is sent.
method	form	How a form is sent: get or post.
colspan	td, th	How many columns a cell spans.
rowspan	td, th	How many rows a cell spans.
charset	meta, script	The character encoding.
async	script	Loads a script without blocking the page.
defer	script	Runs a script after the page is parsed.
sandbox	iframe	Restricts what an iframe may do.
srcdoc	iframe	HTML content for an iframe.
open	details, dialog	Whether a details or dialog is open.
role	all elements	The ARIA role, for accessibility.
aria-label	all elements	An accessible name for an element.
dir	all elements	The text direction.
spellcheck	all elements	Turns spell checking on or off.