Learn HTML:

210 HTML Attribute

Attribute	Belongs to	Description
accept	<input>	Specifies the types of files that the server accepts (only for type="file").
accept-charset	<form>	Specifies the character encodings that are to be used for the form submission.
accesskey	Global Attributes	Specifies a shortcut key to activate/focus an element.
action	<form>	Specifies where to send the form-data when a form is submitted.
align	Not supported in HTML 5.	Specifies the alignment according to surrounding elements. Use CSS instead.
alt	<area>, <img>, <input>	Specifies an alternate text when the original element fails to display.
async	<script>	Specifies that the script is executed asynchronously (only for external scripts).
autocomplete	<form>, <input>	Specifies whether the <form> or the <input> element should have autocomplete enabled.
autofocus	<button>, <input>, <keygen>, <select>, <textarea>	Specifies that the element should automatically get focus when the page loads.
autoplay	<audio>, <video>	Specifies that the audio/video will start playing as soon as it is ready
bgcolor	Not supported in HTML 5.	Specifies the background color of an element. Use CSS instead.
border	Not supported in HTML 5.	Specifies the width of the border of an element. Use CSS instead.
challenge	<keygen>	Specifies that the value of the <keygen> element should be challenged when submitted.
charset	<meta>, <script>	Specifies the character encoding.
checked	<input>	Specifies that an <input> element should be pre-selected when the page loads (for type="checkbox" or type="radio").
cite	<blockquote>, <del>, <ins>, <q>	Specifies a URL which explains the quote/deleted/inserted text.
class	Global Attributes	Specifies one or more classnames for an element (refers to a class in a style sheet).
color	Not supported in HTML 5.	Specifies the text color of an element. Use CSS instead.
cols	<textarea>	Specifies the visible width of a text area.
colspan	<td>, <th>	Specifies the number of columns a table cell should span
content	<meta>	Gives the value associated with the http-equiv or name attribute
contenteditable	Global Attributes	Specifies whether the content of an element is editable or not.
contextmenu	Global Attributes	Specifies a context menu for an element. The context menu appears when a user right-clicks on the element.
controls	<audio>, <video>	Specifies that audio/video controls should be displayed (such as a play/pause button etc).
coords	<area>	Specifies the coordinates of the area.
data	<object>	Specifies the URL of the resource to be used by the object.
data-*	Global Attributes	Used to store custom data private to the page or application.
datetime	<del>, <ins>, <time>	Specifies the date and time.
default	<track>	Specifies that the track is to be enabled if the user's preferences do not indicate that another track would be more appropriate.
defer	<script>	Specifies that the script is executed when the page has finished parsing (only for external scripts).
dir	Global Attributes	Specifies the text direction for the content in an element.
dirname	<input>, <textarea>	Specifies that the text direction will be submitted.
disabled	<button>, <fieldset>, <input>, <keygen>, <optgroup>, <option>, <select>, <textarea>	Specifies that a the specified element/group of elements should be disabled.
download	<a>, <area>	Specifies that the target will be downloaded when a user clicks on the hyperlink.
draggable	Global Attributes	Specifies whether an element is draggable or not.
dropzone	Global Attributes	Specifies whether the dragged data is copied, moved, or linked, when dropped.
enctype	<form>	Specifies how the form-data should be encoded when submitting it to the server (only for method="post").
for	<label>, <output>	Specifies which form element(s) a label/calculation is bound to.
form	<button>, <fieldset>, <input>, <keygen>, <label>, <meter>, <object>, <output>, <select>, <textarea>	Specifies the name of the form the element belongs to
formaction	<button>, <input>	Specifies where to send the form-data when a form is submitted. Only for type="submit".
headers	<td>, <th>	Specifies one or more headers cells a cell is related to.
height	<canvas>, <embed>, <iframe>, <img>, <input>, <object>, <video>	Specifies the height of the element.
hidden	Global Attributes	Specifies that an element is not yet, or is no longer, relevant.
high	<meter>	Specifies the range that is considered to be a high value.
href	<a>, <area>, <base>, <link>	Specifies the URL of the page the link goes to.
hreflang	<a>, <area>, <link>	Specifies the language of the linked document.
http-equiv	<meta>	Provides an HTTP header for the information/value of the content attribute.
id	Global Attributes	Specifies a unique id for an element.
ismap	<img>	Specifies an image as a server-side image-map.
keytype	<keygen>	Specifies the security algorithm of the key.
kind	<track>	Specifies the kind of text track.
label	<track>	Specifies the title of the text track.
lang	Global Attributes	Specifies the language of the element's content.
list	<input>	Refers to a <datalist> element that contains pre-defined options for an <input> element.
loop	<audio>, <video>	Specifies that the audio/video will start over again, every time it is finished.
low	<meter>	Specifies the range that is considered to be a low value.
manifest	<html>	Specifies the address of the document's cache manifest (for offline browsing).
max	<input>, <meter>, <progress>	Specifies the maximum value.
maxlength	<input>, <textarea>	Specifies the maximum number of characters allowed in an element.
media	<a>, <area>, <link>, <source>, <style>	Specifies what media/device the linked document is optimized for.
method	<form>	Specifies the HTTP method to use when sending form-data.
min	<input>, <meter>	Specifies a minimum value.
multiple	<input>, <select>	Specifies that a user can enter more than one value.
muted	<video>	Specifies that the audio output of the video should be muted.
name	<button>, <fieldset>, <form>, <iframe>, <input>, <keygen>, <map>, <meta>, <object>, <output>, <param>, <select>, <textarea>	Specifies the name of the element.
novalidate	<form>	Specifies that the form should not be validated when submitted.
onabort	<audio>, <embed>, <img>, <object>, <video>	Script to be run on abort.
onafterprint	<body>	Script to be run after the document is printed.
onbeforeprint	<body>	Script to be run before the document is printed
onbeforeunload	<body>	Script to be run when the document is about to be unloaded.
onblur	All visible elements.	Script to be run when the element loses focus.
oncanplay	<audio>, <embed>, <object>, <video>	Script to be run when a file is ready to start playing (when it has buffered enough to begin).
oncanplaythrough	<audio>, <video>	Script to be run when a file can be played all the way to the end without pausing for buffering.
onchange	All visible elements.	Script to be run when the value of the element is changed.
onclick	All visible elements.	Script to be run when the element is being clicked.
oncontextmenu	All visible elements.	Script to be run when a context menu is triggered
oncopy	All visible elements.	Script to be run when the content of the element is being copied.
oncuechange	<track>	Script to be run when the cue changes in a <track> element
oncut	All visible elements.	Script to be run when the content of the element is being cut.
ondblclick	All visible elements.	Script to be run when the element is being double-clicked.
ondrag	All visible elements.	Script to be run at the end of a drag operation.
ondragend	All visible elements.	Script to be run at the end of a drag operation.
ondragenter	All visible elements.	Script to be run when an element has been dragged to a valid drop target.
ondragleave	All visible elements.	Script to be run when an element leaves a valid drop target
ondragover	All visible elements.	Script to be run when an element is being dragged over a valid drop target.
ondragstart	All visible elements.	Script to be run at the start of a drag operation.
ondrop	All visible elements.	Script to be run when dragged element is being dropped.
ondurationchange	<audio>, <video>	Script to be run when the length of the media changes
onemptied	<audio>, <video>	Script to be run when something bad happens and the file is suddenly unavailable (like unexpectedly disconnects).
onended	<audio>, <video>	Script to be run when the media has reach the end (a useful event for messages like "thanks for listening")
onerror	<audio>, <body>, <embed>, <img>, <object>, <script>, <style>, <video>	Script to be run when an error occurs.
onfocus	All visible elements.	Script to be run when the element gets focus.
onhashchange	<body>	Script to be run when there has been changes to the anchor part of the a URL.
oninput	All visible elements.	Script to be run when the element gets user input.
oninvalid	All visible elements.	Script to be run when the element is invalid.
onkeydown	All visible elements.	Script to be run when a user is pressing a key.
onkeypress	All visible elements.	Script to be run when a user presses a key.
onkeyup	All visible elements.	Script to be run when a user releases a key.
onload	<body>, <iframe>, <img>, <input>, <link>, <script>, <style>	Script to be run when the element is finished loading.
onloadeddata	<audio>, <video>	Script to be run when media data is loaded
onloadedmetadata	<audio>, <video>	Script to be run when meta data (like dimensions and duration) are loaded.
onloadstart	<audio>, <video>	Script to be run just as the file begins to load before anything is actually loaded.
onmousedown	All visible elements.	Script to be run when a mouse button is pressed down on an element.
onmousemove	All visible elements.	Script to be run as long as the mouse pointer is moving over an element.
onmouseout	All visible elements.	Script to be run when a mouse pointer moves ot of an element.
onmouseover	All visible elements.	Script to be run when a mouse pointer moves over an element.
onmouseup	All visible elements.	Script to be run when a mouse button is released over an element.
onmousewheel	All visible elements.	Script to be run when a mouse wheel is being scrolled over an element.
onoffline	<body>	Script to be run when the browser starts to work offline
ononline	<body>	Script to be run when the browser starts to work online
onpagehide	<body>	Script to be run when a user navigates away from a page.
onpageshow	<body>	Script to be run when a user navigates to a page
onpaste	All visible elements.	Script to be run when the user pastes som content in an elements
onpause	<audio>, <video>	Script to be run when the media is paused either by the user or programmatically.
onplay	<audio>, <video>	Script to be run when the media is ready to start playing.
onplaying	<audio>, <video>	Script to be run when the media actually has started playing.
onpopstate	<body>	Script to be run when the window's history changes.
onprogress	<audio>, <video>	Script to be run when the browser is in the process of getting the media data
onratechange	<audio>, <video>	Script to be run each time the playback rate changes (like when a user switches to a slow motion or fast forward mode).
onreset	<form>	Script to be run when a reset button in a form is clicked.
onresize	<body>	Script to be run when the browser window is being resized.
onscroll	All visible elements.	Script to be run when an element's scrollbar is being scrolled.
onsearch	<input>	Script to be run when the user writes something in a search field (for <input="search">).
onseeked	<audio>, <video>	Script to be run when the seeking attribute is set to false indicating that seeking has ended.
onseeking	<audio>, <video>	Script to be run when the seeking attribute is set to true indicating that seeking is active
onselect	All visible elements.	Script to be run when the element gets selected.
onshow	<menu>	Script to be run when a <menu> element is shown as a context menu
onstalled	<audio>, <video>	Script to be run when the browser is unable to fetch the media data for whatever reason.
onstorage	<body>	Script to be run when a Web Storage area is updated.
onsubmit	<form>	Script to be run when a for is submitted.
onsuspend	<audio>, <video>	Script to be run when fetching the media data is stopped before it is completely loaded for whatever reason.
ontimeupdate	<audio>, <video>	Script to be run when the playing position has changed (like when the user fast forwards to a different point in the media)
ontoggle	<details>	Script to be run when the user opens or closes the <details> element.
onunload	<body>	Script to be run when a page has unloaded (or the browser window has been closed)
onvolumechange	<audio>, <video>	Script to be run each time the volume is changed which (includes setting the volume to "mute").
onwaiting	<audio>, <video>	Script to be run when the media has paused but is expected to resume (like when the media pauses to buffer more data).
onwheel	All visible elements.	Script to be run when the mouse wheel rolls up or down over an element.
open	<details>	Specifies that the details should be visible (open) to the user
optimum	<meter>	Specifies what value is the optimal value for the gauge.
pattern	<input>	Specifies a regular expression that an <input> element's value is checked against.
placeholder	<input>, <textarea>	Specifies a short hint that describes the expected value of the element.
poster	<video>	Specifies an image to be shown while the video is downloading, or until the user hits the play button.
preload	<audio>, <video>	Specifies if and how the author thinks the audio/video should be loaded when the page loads
readonly	<input>, <textarea>	Specifies that the element is read-only
rel	<a>, <area>, <link>	Specifies the relationship between the current document and the linked document.
required	<input>, <select>, <textarea>	Specifies that the element must be filled out before submitting the form.
reversed	<ol>	Specifies that the list order should be descending (9,8,7...).
rows	<textarea>	Specifies the visible number of lines in a text area.
rowspan	<td>, <th>	Specifies the number of rows a table cell should span
sandbox	<iframe>	Enables an extra set of restrictions for the content in an <iframe>
scope	<th>	Specifies whether a header cell is a header for a column, row, or group of columns or rows.
scoped	<style>	Specifies that the styles only apply to this element's parent element and that element's child elements
selected	<option>	Specifies that an option should be pre-selected when the page loads.
shape	<area>	Specifies the shape of the area.
size	<input>, <select>	Specifies the width, in characters (for <input>) or specifies the number of visible options (for <select>)
sizes	<link>	Specifies the size of the linked resource.
span	<col>, <colgroup>	Specifies the number of columns to span.
spellcheck	Global Attributes	Specifies whether the element is to have its spelling and grammar checked or not.
src	<audio>, <embed>, <iframe>, <img>, <input>, <script>, <source>, <track>, <video>	Specifies the URL of the media file.
srcdoc	<iframe>	Specifies the HTML content of the page to show in the <iframe>.
srclang	<track>	Specifies the language of the track text data (required if kind="subtitles").
start	<ol>	Specifies the start value of an ordered list.
step	<input>	Specifies the legal number intervals for an input field.
style	Global Attributes	Specifies an inline CSS style for an element.
tabindex	Global Attributes	Specifies the tabbing order of an element.
target	<a>, <area>, <base>, <form>	Specifies the target for where to open the linked document or where to submit the form.
title	Global Attributes	Specifies extra information about an element.
translate	Global Attributes	Specifies whether the content of an element should be translated or not.
type	<button>, <embed>, <input>, <link>, <menu>, <object>, <script>, <source>, <style>	Specifies the type of element.
usemap	<img>, <object>	Specifies an image as a client-side image-map.
value	<button>, <input>, <li>, <option>, <progress>, <param>	Specifies the value of the element.
width	<canvas>, <embed>, <iframe>, <img>, <input>, <object>, <video>	Specifies the width of the element.
wrap	<textarea>	Specifies how the text in a text area is to be wrapped when submitted in a form.

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Learn HTML:

210 HTML Attribute

HTML Attribute Example

HTML Attribute Code

HTML Attribute Tutorial