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HTML attribute reference - HTML | MDN

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HTML attribute reference - HTML | MDN * Skip to main content * Skip to search HTML HTML: Markup language HTML reference * Elements * Global attributes * Attributes * See all… HTML guides * Responsive images * HTML cheatsheet * Date & time formats * See all… Markup languages * SVG * MathML * XML CSS CSS: Styling language CSS reference * Properties * Selectors * At-rules * Values * See all… CSS guides * Box model * Animations * Flexbox * Colors * See all… Layout cookbook * Column layouts * Centering an element * Card component * See all… JavaScript JS JavaScript: Scripting language JS reference * Standard built-in objects * Expressions & operators * Statements & declarations * Functions * See all… JS guides * Control flow & error handing * Loops and iteration * Working with objects * Using classes * See all… Web APIs Web APIs: Programming interfaces Web API reference * File system API * Fetch API * Geolocation API * HTML DOM API * Push API * Service worker API * See all… Web API guides * Using the Web animation API * Using the Fetch API * Working with the History API * Using the Web speech API * Using web workers All All web technology Technologies * Accessibility * HTTP * URI * Web extensions * WebAssembly * WebDriver * See all… Topics * Media * Performance * Privacy * Security * Progressive web apps Learn Learn web development Frontend developer course * Getting started modules * Core modules * MDN Curriculum * Check out the video course from Scrimba, our partner Learn HTML * Structuring content with HTML module Learn CSS * CSS styling basics module * CSS layout module Learn JavaScript * Dynamic scripting with JavaScript module Tools Discover our tools * Playground * HTTP Observatory * Border-image generator * Border-radius generator * Box-shadow generator * Color format converter * Color mixer * Shape generator About Get to know MDN better * About MDN * Advertise with us * Community * MDN on GitHub Blog Toggle sidebar * Web * HTML * Reference * Attributes Theme * OS default * Light * Dark English (US) Remember language Learn more * Deutsch * English (US) * Español * Français * 日本語 * 한국어 * Português (do Brasil) * Русский * 中文 (简体) * 正體中文 (繁體) HTML attribute reference Elements in HTML have attributes ; these are additional values that configure the elements or adjust their behavior in various ways to meet the criteria the users want. In this article * Attribute list * Content versus IDL attributes * Boolean Attributes * Event handler attributes * See also Attribute list Attribute Name Elements Description accept <form> , <input> List of types the server accepts, typically a file type. accept-charset <form> The character set, which if provided must be "UTF-8" . accesskey Global attribute Keyboard shortcut to activate or add focus to the element. action <form> The URI of a program that processes the information submitted via the form. align <caption> , <col> , <colgroup> , <hr> , <iframe> , <img> , <table> , <tbody> , <td> , <tfoot> , <th> , <thead> , <tr> Specifies the horizontal alignment of the element. allow <iframe> Specifies a feature-policy for the iframe. alpha <input> Allow the user to select a color's opacity on a type="color" input. alt <area> , <img> , <input> Alternative text in case an image can't be displayed. aria-* All elements Modifies an element's state or properties in the accessibility tree. Applicability depends on the specific ARIA attribute. as <link> Specifies the type of content being loaded by the link. async <script> Executes the script asynchronously. autocapitalize Global attribute Sets whether input is automatically capitalized when entered by user autocomplete <form> , <input> , <select> , <textarea> Indicates whether controls in this form can by default have their values automatically completed by the browser. autoplay <audio> , <video> The audio or video should play as soon as possible. background <body> , <table> , <td> , <th> Specifies the URL of an image file. Note: Although browsers and email clients may still support this attribute, it is obsolete. Use CSS background-image instead. bgcolor <body> , <col> , <colgroup> , <marquee> , <table> , <tbody> , <tfoot> , <td> , <th> , <tr> Background color of the element. Note: This is a legacy attribute. Please use the CSS background-color property instead. border <img> , <object> , <table> The border width. Note: This is a legacy attribute. Please use the CSS border property instead. capture <input> From the Media Capture specification , specifies a new file can be captured. charset <meta> Declares the character encoding of the page or script. checked <input> Indicates whether the element should be checked on page load. cite <blockquote> , <del> , <ins> , <q> Contains a URI which points to the source of the quote or change. class Global attribute Often used with CSS to style elements with common properties. color <font> , <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 property instead. colorspace <input> Defines the color space that is used by a type="color" input. cols <textarea> Defines the number of columns in a textarea. colspan <td> , <th> The colspan attribute defines the number of columns a cell should span. content <meta> A value associated with http-equiv or name depending on the context. contenteditable Global attribute Indicates whether the element's content is editable. controls <audio> , <video> Indicates whether the browser should show playback controls to the user. coords <area> A set of values specifying the coordinates of the hot-spot region. crossorigin <audio> , <img> , <link> , <script> , <video> How the element handles cross-origin requests csp <iframe> Specifies the Content Security Policy that an embedded document must agree to enforce upon itself. data <object> Specifies the URL of the resource. data-* Global attribute Lets you attach custom attributes to an HTML element. datetime <del> , <ins> , <time> Indicates the date and time associated with the element. decoding <img> Indicates the preferred method to decode the image. default <track> Indicates that the track should be enabled unless the user's preferences indicate something different. defer <script> Indicates that the script should be executed after the page has been parsed. dir Global attribute Defines the text direction. Allowed values are ltr (Left-To-Right) or rtl (Right-To-Left) dirname <input> , <textarea> disabled <button> , <fieldset> , <input> , <optgroup> , <option> , <select> , <textarea> Indicates whether the user can interact with the element. download <a> , <area> Indicates that the hyperlink is to be used for downloading a resource. draggable Global attribute Defines whether the element can be dragged. enctype <form> Defines the content type of the form data when the method is POST. enterkeyhint <textarea> , contenteditable The enterkeyhint specifies what action label (or icon) to present for the enter key on virtual keyboards. The attribute can be used with form controls (such as the value of textarea elements), or in elements in an editing host (e.g., using contenteditable attribute). elementtiming <img> , <image> elements inside an <svg> , poster images of <video> elements, elements which have a background-image , and elements containing text nodes, such as a <p> Indicates that an element is flagged for tracking by PerformanceObserver objects using the "element" type. For more details, see the PerformanceElementTiming interface. fetchpriority <img> , <link> , <script> Signals that fetching a particular image early in the loading process has more or less impact on user experience than a browser can reasonably infer when assigning an internal priority. for <label> , <output> Describes elements which belongs to this one. form <button> , <fieldset> , <input> , <object> , <output> , <select> , <textarea> Indicates the form that is the owner of the element. formaction <input> , <button> Indicates the action of the element, overriding the action defined in the <form> . formenctype <button> , <input> If the button/input is a submit button (e.g., type="submit" ), this attribute sets the encoding type to use during form submission. If this attribute is specified, it overrides the enctype attribute of the button's form owner. formmethod <button> , <input> If the button/input is a submit button (e.g., type="submit" ), this attribute sets the submission method to use during form submission ( GET , POST , etc.). If this attribute is specified, it overrides the method attribute of the button's form owner. formnovalidate <button> , <input> If the button/input is a submit button (e.g., type="submit" ), this boolean attribute specifies that the form is not to be validated when it is submitted. If this attribute is specified, it overrides the novalidate attribute of the button's form owner. formtarget <button> , <input> If the button/input is a submit button (e.g., type="submit" ), this attribute specifies the browsing context (for example, tab, window, or inline frame) in which to display the response that is received after submitting the form. If this attribute is specified, it overrides the target attribute of the button's form owner. headers <td> , <th> IDs of the <th> elements which applies to this element. height <canvas> , <embed> , <iframe> , <img> , <input> , <object> , <video> Specifies the height of elements listed here. For all other elements, use the CSS height property. Note: In some instances, such as <div> , this is a legacy attribute, in which case the CSS height property should be used instead. hidden Global attribute Prevents rendering of given element, while keeping child elements, e.g. script elements, active. high <meter> Indicates the lower bound of the upper range. href <a> , <area> , <base> , <link> The URL of a linked resource. hreflang <a> , <link> Specifies the language of the linked resource. http-equiv <meta> Defines a pragma directive. id Global attribute Often used with CSS to style a specific element. The value of this attribute must be unique. integrity <link> , <script> This attribute contains one or more hashes of the resource, and is used to ensure that the content of the resource is what the developer expects it to be, and has not been replaced with a malicious copy in a supply chain attack . See Subresource Integrity . inputmode <textarea> , contenteditable Provides a hint as to the type of data that might be entered by the user while editing the element or its contents. The attribute can be used with form controls (such as the value of textarea elements), or in elements in an editing host (e.g., using contenteditable attribute). ismap <img> Indicates that the image is part of a server-side image map. itemprop Global attribute kind <track> Specifies the kind of text track. label <optgroup> , <option> , <track> Specifies a user-readable title of the element. lang Global attribute Defines the language used in the element. language <script> Defines the script language used in the element. loading <img> , <iframe> Indicates if the element should be loaded lazily ( loading="lazy" ) or loaded immediately ( loading="eager" ). list <input> Identifies a list of pre-defined options to suggest to the user. loop <audio> , <marquee> , <video> Indicates whether the media should start playing from the start when it's finished. low <meter> Indicates the upper bound of the lower range. max <input> , <meter> , <progress> Indicates the maximum value allowed. maxlength <input> , <textarea> Defines the maximum number of characters allowed in the element. minlength <input> , <textarea> Defines the minimum number of characters allowed in the element. media <a> , <area> , <link> , <source> , <style> Specifies a hint of the media for which the linked resource was designed. method <form> Defines which HTTP method to use when submitting the form. Can be GET (default) or POST . min <input> , <meter> Indicates the minimum value allowed. multiple <input> , <select> Indicates whether multiple values can be entered in an input of the type email or file . muted <audio> , <video> Indicates whether the audio will be initially silenced on page load. name <button> , <form> , <fieldset> , <iframe> , <input> , <object> , <output> , <select> , <textarea> , <map> , <meta> , <param> Name of the element. For example used by the server to identify the fields in form submits. novalidate <form> This attribute indicates that the form shouldn't be validated when submitted. open <details> , <dialog> Indicates whether the contents are currently visible (in the case of a <details> element) or whether the dialog is active and can be interacted with (in the case of a <dialog> element). optimum <meter> Indicates the optimal numeric value. pattern <input> Defines a regular expression which the element's value will be validated against. ping <a> , <area> The ping attribute specifies a space-separated list of URLs to be notified if a user follows the hyperlink. placeholder <input> , <textarea> Provides a hint to the user of what can be entered in the field. playsinline <video> A Boolean attribute indicating that the video is to be played "inline"; that is, within the element's playback area. Note that the absence of this attribute does not imply that the video will always be played in fullscreen. poster <video> A URL indicating a poster frame to show until the user plays or seeks. preload <audio> , <video> Indicates whether the whole resource, parts of it or nothing should be preloaded. readonly <input> , <textarea> Indicates whether the element can be edited. referrerpolicy <a> , <area> , <iframe> , <img> , <link> , <script> Specifies which referrer is sent when fetching the resource. rel <a> , <area> , <link> Specifies the relationship of the target object to the link object. required <input> , <select> , <textarea> Indicates whether this element is required to fill out or not. reversed <ol> Indicates whether the list should be displayed in a descending order instead of an ascending order. role Global attribute Defines an explicit role for an element for use by assistive technologies. rows <textarea> Defines the number of rows in a text area. rowspan <td> , <th> Defines the number of rows a table cell should span over. sandbox <iframe> Stops a document loaded in an iframe from using certain features (such as submitting forms or opening new windows). scope <th> Defines the cells that the header test (defined in the th element) relates to. selected <option> Defines a value which will be selected on page load. shape <a> , <area> size <input> , <select> Defines the width of the element (in pixels). If the element's type attribute is text or password then it's the number of characters. sizes <link> , <img> , <source> slot Global attribute Assigns a slot in a shadow DOM shadow tree to an element. span <col> , <colgroup> spellcheck Global attribute Indicates whether spell checking is allowed for the element. src <audio> , <embed> , <iframe> , <img> , <input> , <script> , <source> , <track> , <video> The URL of the embeddable content. srcdoc <iframe> srclang <track> srcset <img> , <source> One or more responsive image candidates. start <ol> Defines the first number if other than 1. step <input> style Global attribute Defines CSS styles which will override styles previously set. summary <table> tabindex Global attribute Overrides the browser's default tab order and follows the one specified instead. target <a> , <area> , <base> , <form> Specifies where to open the linked document (in the case of an <a> element) or where to display the response received (in the case of a <form> element) title Global attribute Text to be displayed in a tooltip when hovering over the element. translate Global attribute Specify whether an element's attribute values and the values of its Text node children are to be translated when the page is localized, or whether to leave them unchanged. type <button> , <input> , <embed> , <object> , <ol> , <script> , <source> , <style> , <menu> , <link> Defines the type of the element. usemap <img> , <input> , <object> value <button> , <data> , <input> , <li> , <meter> , <option> , <progress> , <param> Defines a default value which will be displayed in the element on page load. width <canvas> , <embed> , <iframe> , <img> , <input> , <object> , <video> For the elements listed here, this establishes the element's width. Note: For all other instances, such as <div> , this is a legacy attribute, in which case the CSS width property should be used instead. wrap <textarea> Indicates whether the text should be wrapped. Content versus IDL attributes In HTML, most attributes have two faces: the content attribute and the IDL (Interface Definition Language) attribute . The content attribute is the attribute as you set it from the content (the HTML code) and you can set it or get it via element.setAttribute() or element.getAttribute() . The content attribute is always a string even when the expected value should be an integer. For example, to set an <input> element's maxlength to 42 using the content attribute, you have to call setAttribute("maxlength", "42") on that element. The IDL attribute is also known as a JavaScript property. These are the attributes you can read or set using JavaScript properties like element.foo . The IDL attribute is always going to use (but might transform) the

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