HTML Attribute List

Attribute Name	PD4ML Support by Elements	Description
`accept`accept	`<form>`<form>, `<input>`<input>	List of types the server accepts, typically a file type.
`accept-charset`accept-charset	`<form>`<form>	List of supported charsets.
`accesskey`accesskey	Global attribute	Defines a keyboard shortcut to activate or add focus to the element.
`action`action	`<form>`<form>	The URI of a program that processes the information submitted via the form.
`align`align	`<applet>`<applet>, `<caption>`<caption>, `<col>`<col>, `<colgroup>`<colgroup>, `<hr>`<hr>, `<iframe>`<iframe>, `<img>`<img>, `<table>`<table>, `<tbody>`<tbody>, `<td>`<td>, `<tfoot>`<tfoot>, `<th>`<th>, `<thead>`<thead>, `<tr>`<tr>	Specifies the horizontal alignment of the element.
`alt`alt	`<applet>`<applet>, `<area>`<area>, `<img>`<img>, `<input>`<input>	Alternative text in case an image can't be displayed.
`async`async	`<script>`<script>	Indicates that the script should be executed asynchronously.
`autocapitalize`autocapitalize	Global attribute	Controls whether and how text input is automatically capitalized as it is entered/edited by the user.
`autocomplete`autocomplete	`<form>`<form>, `<input>`<input>, `<textarea>`<textarea>	Indicates whether controls in this form can by default have their values automatically completed by the browser.
`autofocus`autofocus	`<button>`<button>, `<input>`<input>, `<keygen>`<keygen>, `<select>`<select>, `<textarea>`<textarea>	The element should be automatically focused after the page loaded.
`autoplay`autoplay	`<audio>`<audio>, `<video>`<video>	The audio or video should play as soon as possible.
`bgcolor`bgcolor	`<body>`<body>, `<col>`<col>, `<colgroup>`<colgroup>, `<marquee>`<marquee>, `<table>`<table>, `<tbody>`<tbody>, `<tfoot>`<tfoot>, `<td>`<td>, `<th>`<th>, `<tr>`<tr>	Background color of the element. Note: This is a legacy attribute. Please use the CSS `background-color`background-color property instead.
`border`border	`<img>`<img>, `<object>`<object>, `<table>`<table>	The border width. Note: This is a legacy attribute. Please use the CSS `border`border property instead.
`buffered`buffered	`<audio>`<audio>, `<video>`<video>	Contains the time range of already buffered media.
`challenge`challenge	`<keygen>`<keygen>	A challenge string that is submitted along with the public key.
`charset`charset	`<meta>`<meta>, `<script>`<script>	Declares the character encoding of the page or script.
`checked`checked	`<command>`<command>, `<input>`<input>	Indicates whether the element should be checked on page load.
`cite`cite	`<blockquote>`<blockquote>, `<del>`<del>, `<ins>`<ins>, `<q>`<q>	Contains a URI which points to the source of the quote or change.
`class`class	Global attribute	Often used with CSS to style elements with common properties.
`code`code	`<applet>`<applet>	Specifies the URL of the applet's class file to be loaded and executed.
`codebase`codebase	`<applet>`<applet>	This attribute gives the absolute or relative URL of the directory where applets' .class files referenced by the code attribute are stored.
`color`color	`<basefont>`<basefont>, `<font>`<font>, `<hr>`<hr>	This attribute sets the text color using either a named color or a color specified in the hexadecimal #RRGGBB format. Note: This is a legacy attribute. Please use the CSS `color`color property instead.
`cols`cols	`<textarea>`<textarea>	Defines the number of columns in a textarea.
`colspan`colspan	`<td>`<td>, `<th>`<th>	The colspan attribute defines the number of columns a cell should span.
`content`content	`<meta>`<meta>	A value associated with `http-equiv`http-equiv or `name`name depending on the context.
`contenteditable`contenteditable	Global attribute	Indicates whether the element's content is editable.
`contextmenu`contextmenu	Global attribute	Defines the ID of a `<menu>`<menu> element which will serve as the element's context menu.
`controls`controls	`<audio>`<audio>, `<video>`<video>	Indicates whether the browser should show playback controls to the user.
`coords`coords	`<area>`<area>	A set of values specifying the coordinates of the hot-spot region.
`crossorigin`crossorigin	`<audio>`<audio>, `<img>`<img>, `<link>`<link>, `<script>`<script>, `<video>`<video>	How the element handles cross-origin requests
`data`data	`<object>`<object>	Specifies the URL of the resource.
`data-`data-	Global attribute	Lets you attach custom attributes to an HTML element.
`datetime`datetime	`<del>`<del>, `<ins>`<ins>, `<time>`<time>	Indicates the date and time associated with the element.
`default`default	`<track>`<track>	Indicates that the track should be enabled unless the user's preferences indicate something different.
`defer`defer	`<script>`<script>	Indicates that the script should be executed after the page has been parsed.
`dir`dir	Global attribute	Defines the text direction. Allowed values are ltr (Left-To-Right) or rtl (Right-To-Left)
`dirname`dirname	`<input>`<input>, `<textarea>`<textarea>
`disabled`disabled	`<button>`<button>, `<command>`<command>, `<fieldset>`<fieldset>, `<input>`<input>, `<keygen>`<keygen>, `<optgroup>`<optgroup>, `<option>`<option>, `<select>`<select>, `<textarea>`<textarea>	Indicates whether the user can interact with the element.
`download`download	`<a>`<a>, `<area>`<area>	Indicates that the hyperlink is to be used for downloading a resource.
`draggable`draggable	Global attribute	Defines whether the element can be dragged.
`dropzone`dropzone	Global attribute	Indicates that the element accept the dropping of content on it.
`enctype`enctype	`<form>`<form>	Defines the content type of the form date when the `method`method is POST.
`for`for	`<label>`<label>, `<output>`<output>	Describes elements which belongs to this one.
`form`form	`<button>`<button>, `<fieldset>`<fieldset>, `<input>`<input>, `<keygen>`<keygen>, `<label>`<label>, `<meter>`<meter>, `<object>`<object>, `<output>`<output>, `<progress>`<progress>, `<select>`<select>, `<textarea>`<textarea>	Indicates the form that is the owner of the element.
`formaction`formaction	`<input>`<input>, `<button>`<button>	Indicates the action of the element, overriding the action defined in the `<form>`<form>.
`headers`headers	`<td>`<td>, `<th>`<th>	IDs of the `<th>`<th> elements which applies to this element.
`height`height	`<canvas>`<canvas>, `<embed>`<embed>, `<iframe>`<iframe>, `<img>`<img>, `<input>`<input>, `<object>`<object>, `<video>`<video>	Specifies the height of elements listed here. For all other elements, use the CSS `height`height property. Note: In some instances, such as `<div>`<div>, this is a legacy attribute, in which case the CSS `height`height property should be used instead.
`hidden`hidden	Global attribute	Prevents rendering of given element, while keeping child elements, e.g. script elements, active.
`high`high	`<meter>`<meter>	Indicates the lower bound of the upper range.
`href`href	`<a>`<a>, `<area>`<area>, `<base>`<base>, `<link>`<link>	The URL of a linked resource.
`hreflang`hreflang	`<a>`<a>, `<area>`<area>, `<link>`<link>	Specifies the language of the linked resource.
`http-equiv`http-equiv	`<meta>`<meta>
`icon`icon	`<command>`<command>	Specifies a picture which represents the command.
`id`id	Global attribute	Often used with CSS to style a specific element. The value of this attribute must be unique.
`integrity`integrity	`<link>`<link>, `<script>`<script>	Security Feature that allows browsers to verify what they fetch. MDN Link
`ismap`ismap	`<img>`<img>	Indicates that the image is part of a server-side image map.
`itemprop`itemprop	Global attribute
`keytype`keytype	`<keygen>`<keygen>	Specifies the type of key generated.
`kind`kind	`<track>`<track>	Specifies the kind of text track.
`label`label	`<track>`<track>	Specifies a user-readable title of the text track.
`lang`lang	Global attribute	Defines the language used in the element.
`language`language	`<script>`<script>	Defines the script language used in the element.
`list`list	`<input>`<input>	Identifies a list of pre-defined options to suggest to the user.
`loop`loop	`<audio>`<audio>, `<bgsound>`<bgsound>, `<marquee>`<marquee>, `<video>`<video>	Indicates whether the media should start playing from the start when it's finished.
`low`low	`<meter>`<meter>	Indicates the upper bound of the lower range.
`manifest`manifest	`<html>`<html>	Specifies the URL of the document's cache manifest.
`max`max	`<input>`<input>, `<meter>`<meter>, `<progress>`<progress>	Indicates the maximum value allowed.
`maxlength`maxlength	`<input>`<input>, `<textarea>`<textarea>	Defines the maximum number of characters allowed in the element.
`minlength`minlength	`<input>`<input>, `<textarea>`<textarea>	Defines the minimum number of characters allowed in the element.
`media`media	`<a>`<a>, `<area>`<area>, `<link>`<link>, `<source>`<source>, `<style>`<style>	Specifies a hint of the media for which the linked resource was designed.
`method`method	`<form>`<form>	Defines which HTTP method to use when submitting the form. Can be `GET`GET (default) or `POST`POST.
`min`min	`<input>`<input>, `<meter>`<meter>	Indicates the minimum value allowed.
`multiple`multiple	`<input>`<input>, `<select>`<select>	Indicates whether multiple values can be entered in an input of the type `email`email or `file`file.
`muted`muted	`<audio>`<audio>, `<video>`<video>	Indicates whether the audio will be initially silenced on page load.
`name`name	`<button>`<button>, `<form>`<form>, `<fieldset>`<fieldset>, `<iframe>`<iframe>, `<input>`<input>, `<keygen>`<keygen>, `<object>`<object>, `<output>`<output>, `<select>`<select>, `<textarea>`<textarea>, `<map>`<map>, `<meta>`<meta>, `<param>`<param>	Name of the element. For example used by the server to identify the fields in form submits.
`novalidate`novalidate	`<form>`<form>	This attribute indicates that the form shouldn't be validated when submitted.
`open`open	`<details>`<details>	Indicates whether the details will be shown on page load.
`optimum`optimum	`<meter>`<meter>	Indicates the optimal numeric value.
`pattern`pattern	`<input>`<input>	Defines a regular expression which the element's value will be validated against.
`ping`ping	`<a>`<a>, `<area>`<area>
`placeholder`placeholder	`<input>`<input>, `<textarea>`<textarea>	Provides a hint to the user of what can be entered in the field.
`poster`poster	`<video>`<video>	A URL indicating a poster frame to show until the user plays or seeks.
`preload`preload	`<audio>`<audio>, `<video>`<video>	Indicates whether the whole resource, parts of it or nothing should be preloaded.
`radiogroup`radiogroup	`<command>`<command>
`readonly`readonly	`<input>`<input>, `<textarea>`<textarea>	Indicates whether the element can be edited.
`rel`rel	`<a>`<a>, `<area>`<area>, `<link>`<link>	Specifies the relationship of the target object to the link object.
`required`required	`<input>`<input>, `<select>`<select>, `<textarea>`<textarea>	Indicates whether this element is required to fill out or not.
`reversed`reversed	`<ol>`<ol>	Indicates whether the list should be displayed in a descending order instead of a ascending.
`rows`rows	`<textarea>`<textarea>	Defines the number of rows in a text area.
`rowspan`rowspan	`<td>`<td>, `<th>`<th>	Defines the number of rows a table cell should span over.
`sandbox`sandbox	`<iframe>`<iframe>	Stops a document loaded in an iframe from using certain features (such as submitting forms or opening new windows).
`scope`scope	`<th>`<th>	Defines the cells that the header test (defined in the `th`th element) relates to.
`scoped`scoped	`<style>`<style>
`selected`selected	`<option>`<option>	Defines a value which will be selected on page load.
`shape`shape	`<a>`<a>, `<area>`<area>
`size`size	`<input>`<input>, `<select>`<select>	Defines the width of the element (in pixels). If the element's `type`type attribute is `text`text or `password`password then it's the number of characters.
`sizes`sizes	`<link>`<link>, `<img>`<img>, `<source>`<source>
`slot`slot	Global attribute	Assigns a slot in a shadow DOM shadow tree to an element.
`span`span	`<col>`<col>, `<colgroup>`<colgroup>
`spellcheck`spellcheck	Global attribute	Indicates whether spell checking is allowed for the element.
`src`src	`<audio>`<audio>, `<embed>`<embed>, `<iframe>`<iframe>, `<img>`<img>, `<input>`<input>, `<script>`<script>, `<source>`<source>, `<track>`<track>, `<video>`<video>	The URL of the embeddable content.
`srcdoc`srcdoc	`<iframe>`<iframe>
`srclang`srclang	`<track>`<track>
`srcset`srcset	`<img>`<img>
`start`start	`<ol>`<ol>	Defines the first number if other than 1.
`step`step	`<input>`<input>
`style`style	Global attribute	Defines CSS styles which will override styles previously set.
`summary`summary	`<table>`<table>
`tabindex`tabindex	Global attribute	Overrides the browser's default tab order and follows the one specified instead.
`target`target	`<a>`<a>, `<area>`<area>, `<base>`<base>, `<form>`<form>
`title`title	Global attribute	Text to be displayed in a tooltip when hovering over the element.
`translate`translate	Global attribute	Specify whether an element’s attribute values and the values of its `Text`Text node children are to be translated when the page is localized, or whether to leave them unchanged.
`type`type	`<button>`<button>, `<input>`<input>, `<command>`<command>, `<embed>`<embed>, `<object>`<object>, `<script>`<script>, `<source>`<source>, `<style>`<style>, `<menu>`<menu>	Defines the type of the element.
`usemap`usemap	`<img>`<img>, `<input>`<input>, `<object>`<object>
`value`value	`<button>`<button>, `<option>`<option>, `<input>`<input>, `<li>`<li>, `<meter>`<meter>, `<progress>`<progress>, `<param>`<param>	Defines a default value which will be displayed in the element on page load.
`width`width	`<canvas>`<canvas>, `<embed>`<embed>, `<iframe>`<iframe>, `<img>`<img>, `<input>`<input>, `<object>`<object>, `<video>`<video>	For the elements listed here, this establishes the element's width. Note: For all other instances, such as `<div>`<div>, this is a legacy attribute, in which case the CSS `width`width property should be used instead.
`wrap`wrap	`<textarea>`<textarea>	Indicates whether the text should be wrapped.