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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"> <!DOCTYPE html> <html lang="en-US-x-Hixie" class="split chapter"><head><title>4.11.5 Commands — HTML5 </title><style type="text/css"> pre { margin-left: 2em; white-space: pre-wrap; } h2 { margin: 3em 0 1em 0; } h3 { margin: 2.5em 0 1em 0; } h4 { margin: 2.5em 0 0.75em 0; } h5, h6 { margin: 2.5em 0 1em; } h1 + h2, h1 + h2 + h2 { margin: 0.75em 0 0.75em; } h2 + h3, h3 + h4, h4 + h5, h5 + h6 { margin-top: 0.5em; } p { margin: 1em 0; } hr:not(.top) { display: block; background: none; border: none; padding: 0; margin: 2em 0; height: auto; } dl, dd { margin-top: 0; margin-bottom: 0; } dt { margin-top: 0.75em; margin-bottom: 0.25em; clear: left; } dt + dt { margin-top: 0; } dd dt { margin-top: 0.25em; margin-bottom: 0; } dd p { margin-top: 0; } dd dl + p { margin-top: 1em; } dd table + p { margin-top: 1em; } p + * > li, dd li { margin: 1em 0; } dt, dfn { font-weight: bold; font-style: normal; } dt dfn { font-style: italic; } pre, code { font-size: inherit; 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Implementation requirements are given below this box.'; color: black; font-style: italic; border: solid 2px; background: white; padding: 0 0.25em; } </style><link href="data:text/css," id="complete" rel="stylesheet" title="Complete specification"><link href="data:text/css,.impl%20%7B%20display:%20none;%20%7D%0Ahtml%20%7B%20border:%20solid%20yellow;%20%7D%20.domintro:before%20%7B%20display:%20none;%20%7D" id="author" rel="alternate stylesheet" title="Author documentation only"><link href="data:text/css,.impl%20%7B%20background:%20%23FFEEEE;%20%7D%20.domintro:before%20%7B%20background:%20%23FFEEEE;%20%7D" id="highlight" rel="alternate stylesheet" title="Highlight implementation requirements"><script type="text/javascript"> function getCookie(name) { var params = location.search.substr(1).split("&"); for (var index = 0; index < params.length; index++) { if (params[index] == name) return "1"; var data = params[index].split("="); if (data[0] == name) return unescape(data[1]); } var cookies = document.cookie.split("; "); for (var index = 0; index < cookies.length; index++) { var data = cookies[index].split("="); if (data[0] == name) return unescape(data[1]); } return null; } </script> <script src="link-fixup.js"></script> <link href="style.css" rel="stylesheet"><link href="interactive-elements.html" title="4.11 Interactive elements" rel="prev"> <link href="spec.html#contents" title="Table of contents" rel="index"> <link href="links.html" title="4.12 Links" rel="next"> </head><body><div class="head" id="head"> <a href="http://www.w3.org/"><img alt="W3C" height="48" src="http://www.w3.org/Icons/w3c_home" width="72"></a> <h1>HTML5</h1> </div><div> <a href="interactive-elements.html" class="prev">4.11 Interactive elements</a> – <a href="spec.html#contents">Table of contents</a> – <a href="links.html" class="next">4.12 Links</a> <ol class="toc"><li><ol><li><ol><li><a href="commands.html#commands">4.11.5 Commands</a> <ol><li><a href="commands.html#using-the-a-element-to-define-a-command">4.11.5.1 Using the <code>a</code> element to define a command</a></li><li><a href="commands.html#using-the-button-element-to-define-a-command">4.11.5.2 Using the <code>button</code> element to define a command</a></li><li><a href="commands.html#using-the-input-element-to-define-a-command">4.11.5.3 Using the <code>input</code> element to define a command</a></li><li><a href="commands.html#using-the-option-element-to-define-a-command">4.11.5.4 Using the <code>option</code> element to define a command</a></li><li><a href="commands.html#using-the-command-element-to-define-a-command">4.11.5.5 Using the <code>command</code> element to define a command</a></li><li><a href="commands.html#using-the-accesskey-attribute-on-a-label-element-to-define-a-command">4.11.5.6 Using the <code title="attr-accesskey">accesskey</code> attribute on a <code>label</code> element to define a command</a></li><li><a href="commands.html#using-the-accesskey-attribute-on-a-legend-element-to-define-a-command">4.11.5.7 Using the <code title="attr-accesskey">accesskey</code> attribute on a <code>legend</code> element to define a command</a></li><li><a href="commands.html#using-the-accesskey-attribute-to-define-a-command-on-other-elements">4.11.5.8 Using the <code title="attr-accesskey">accesskey</code> attribute to define a command on other elements</a></li></ol></li></ol></li></ol></li></ol></div> <h4 id="commands">4.11.5 Commands</h4>A <dfn id="concept-command" title="concept-command">command</dfn> is the abstraction behind menu items, buttons, and links.Commands are defined to have the following <dfn id="concept-facet" title="concept-facet">facets</dfn>:<dl><dt><dfn id="command-facet-type" title="command-facet-Type">Type</dfn></dt> <dd>The kind of command: "command", meaning it is a normal command; "radio", meaning that triggering the command will, amongst other things, set the <a href="#command-facet-checkedstate" title="command-facet-CheckedState">Checked State</a> to true (and probably uncheck some other commands); or "checkbox", meaning that triggering the command will, amongst other things, toggle the value of the <a href="#command-facet-checkedstate" title="command-facet-CheckedState">Checked State</a>.</dd> <dt><dfn id="command-facet-id" title="command-facet-ID">ID</dfn></dt> <dd>The name of the command, for referring to the command from the markup or from script. If a command has no ID, it is an <dfn id="anonymous-command">anonymous command</dfn>.</dd> <dt><dfn id="command-facet-label" title="command-facet-Label">Label</dfn></dt> <dd>The name of the command as seen by the user.</dd> <dt><dfn id="command-facet-hint" title="command-facet-Hint">Hint</dfn></dt> <dd>A helpful or descriptive string that can be shown to the user.</dd> <dt><dfn id="command-facet-icon" title="command-facet-Icon">Icon</dfn></dt> <dd>An <a href="urls.html#absolute-url">absolute URL</a> identifying a graphical image that represents the action. A command might not have an Icon.</dd> <dt><dfn id="command-facet-accesskey" title="command-facet-AccessKey">Access Key</dfn></dt> <dd>A key combination selected by the user agent that triggers the command. A command might not have an Access Key.</dd> <dt><dfn id="command-facet-hiddenstate" title="command-facet-HiddenState">Hidden State</dfn></dt> <dd>Whether the command is hidden or not (basically, whether it should be shown in menus).</dd> <dt><dfn id="command-facet-disabledstate" title="command-facet-DisabledState">Disabled State</dfn></dt> <dd>Whether the command is relevant and can be triggered or not.</dd> <dt><dfn id="command-facet-checkedstate" title="command-facet-CheckedState">Checked State</dfn></dt> <dd>Whether the command is checked or not.</dd> <dt><dfn id="command-facet-action" title="command-facet-Action">Action</dfn></dt> <dd>The actual effect that triggering the command will have. This could be a scripted event handler, a <a href="urls.html#url">URL</a> to which to <a href="history.html#navigate">navigate</a>, or a form submission.</dd> </dl>These facets are exposed on elements using the <dfn id="command-api">command API</dfn>:<dl class="domintro"><dt><var title="">element</var> . <code title="dom-command-ro-commandType"><a href="#dom-command-ro-commandtype">commandType</a></code></dt> <dd> Exposes the <a href="#command-facet-type" title="command-facet-Type">Type</a> facet of the command. </dd> <dt><var title="">element</var> . <code title="dom-id"><a href="elements.html#dom-id">id</a></code></dt> <dd> Exposes the <a href="#command-facet-id" title="command-facet-ID">ID</a> facet of the command. </dd> <dt><var title="">element</var> . <code title="dom-command-ro-label"><a href="#dom-command-ro-label">label</a></code></dt> <dd> Exposes the <a href="#command-facet-label" title="command-facet-Label">Label</a> facet of the command. </dd> <dt><var title="">element</var> . <code title="dom-title"><a href="elements.html#dom-title">title</a></code></dt> <dd> Exposes the <a href="#command-facet-hint" title="command-facet-Hint">Hint</a> facet of the command. </dd> <dt><var title="">element</var> . <code title="dom-command-ro-icon"><a href="#dom-command-ro-icon">icon</a></code></dt> <dd> Exposes the <a href="#command-facet-icon" title="command-facet-Icon">Icon</a> facet of the command. </dd> <dt><var title="">element</var> . <code title="dom-accessKeyLabel"><a href="editing.html#dom-accesskeylabel">accessKeyLabel</a></code></dt> <dd> Exposes the <a href="#command-facet-accesskey" title="command-facet-AccessKey">Access Key</a> facet of the command. </dd> <dt><var title="">element</var> . <code title="dom-hidden"><a href="editing.html#dom-hidden">hidden</a></code></dt> <dd> Exposes the state of the element's <code title="attr-hidden"><a href="editing.html#the-hidden-attribute">hidden</a></code> attribute, which is generally equivalent to the <a href="#command-facet-hiddenstate" title="command-facet-HiddenState">Hidden State</a> facet of the command. For <code><a href="forms.html#the-label-element">label</a></code> and <code><a href="forms.html#the-legend-element">legend</a></code> elements (used in conjunction with the <code title="attr-accesskey"><a href="editing.html#the-accesskey-attribute">accesskey</a></code> attribute), the <a href="#command-facet-hiddenstate" title="command-facet-HiddenState">Hidden State</a> facet is derived from another element (the one that the <a href="editing.html#assigned-access-key">assigned access key</a> will trigger), and cannot be directly accessed from the element. </dd> <dt><var title="">element</var> . <code title="dom-command-ro-disabled"><a href="#dom-command-ro-disabled">disabled</a></code></dt> <dd> Exposes the <a href="#command-facet-disabledstate" title="command-facet-DisabledState">Disabled State</a> facet of the command. </dd> <dt><var title="">element</var> . <code title="dom-command-ro-checked"><a href="#dom-command-ro-checked">checked</a></code></dt> <dd> Exposes the <a href="#command-facet-checkedstate" title="command-facet-CheckedState">Checked State</a> facet of the command. </dd> <dt><var title="">element</var> . <code title="dom-click"><a href="editing.html#dom-click">click</a></code>()</dt> <dd> Triggers the <a href="#command-facet-action" title="command-facet-Action">Action</a> of the command. </dd> </dl><div class="impl"> The <dfn id="dom-command-ro-commandtype" title="dom-command-ro-commandType"><code>commandType</code></dfn> attribute must return a string whose value is either "<code title="">command</code>", "<code title="">radio</code>", or "<code title="">checkbox</code>", depending on whether the <a href="#command-facet-type" title="command-facet-Type">Type</a> of the command defined by the element is "command", "radio", or "checkbox" respectively. If the element does not define a command, it must return null. The <dfn id="dom-command-ro-label" title="dom-command-ro-label"><code>label</code></dfn> attribute must return the command's <a href="#command-facet-label" title="command-facet-Label">Label</a>, or null if the element does not define a command or does not specify a <a href="#command-facet-label" title="command-facet-Label">Label</a>. This attribute will be shadowed by the <code title="">label</code> IDL attribute on various elements. The <dfn id="dom-command-ro-icon" title="dom-command-ro-icon"><code>icon</code></dfn> attribute must return the <a href="urls.html#absolute-url">absolute URL</a> of the command's <a href="#command-facet-icon" title="command-facet-Icon">Icon</a>. If the element does not specify an icon, or if the element does not define a command, then the attribute must return null. This attribute will be shadowed by the <code title="dom-command-icon"><a href="interactive-elements.html#dom-command-icon">icon</a></code> IDL attribute on <code><a href="interactive-elements.html#the-command-element">command</a></code> elements. The <dfn id="dom-command-ro-disabled" title="dom-command-ro-disabled"><code>disabled</code></dfn> attribute must return true if the command's <a href="#command-facet-disabledstate" title="command-facet-DisabledState">Disabled State</a> is that the command is disabled, and false if the command is not disabled. This attribute is not affected by the command's <a href="#command-facet-hiddenstate" title="command-facet-HiddenState">Hidden State</a>. If the element does not define a command, the attribute must return false. This attribute will be shadowed by the <code title="">disabled</code> IDL attribute on various elements. The <dfn id="dom-command-ro-checked" title="dom-command-ro-checked"><code>checked</code></dfn> attribute must return true if the command's <a href="#command-facet-checkedstate" title="command-facet-CheckedState">Checked State</a> is that the command is checked, and false if it is that the command is not checked. If the element does not define a command, the attribute must return false. This attribute will be shadowed by the <code title="">checked</code> IDL attribute on <code><a href="the-input-element.html#the-input-element">input</a></code> and <code><a href="interactive-elements.html#the-command-element">command</a></code> elements. The <a href="#command-facet-id" title="command-facet-ID">ID</a> facet is exposed by the <code title="dom-id"><a href="elements.html#dom-id">id</a></code> IDL attribute, the <a href="#command-facet-hint" title="command-facet-Hint">Hint</a> facet is exposed by the <code title="dom-title"><a href="elements.html#dom-title">title</a></code> IDL attribute, the <a href="#command-facet-accesskey" title="command-facet-AccessKey">AccessKey</a> facet is exposed by the <code title="dom-accessKeyLabel"><a href="editing.html#dom-accesskeylabel">accessKeyLabel</a></code> IDL attribute, and the <a href="#command-facet-hiddenstate" title="command-facet-HiddenState">Hidden State</a> facet is exposed by the <code title="dom-hidden"><a href="editing.html#dom-hidden">hidden</a></code> IDL attribute. </div><hr><dl class="domintro"><dt><var title="">document</var> . <code title="dom-document-commands"><a href="#dom-document-commands">commands</a></code></dt> <dd> Returns an <code><a href="common-dom-interfaces.html#htmlcollection">HTMLCollection</a></code> of the elements in the <code><a href="infrastructure.html#document">Document</a></code> that define commands and have IDs. </dd> </dl><div class="impl"> The <dfn id="dom-document-commands" title="dom-document-commands"><code>commands</code></dfn> attribute of the document's <code><a href="dom.html#htmldocument">HTMLDocument</a></code> interface must return an <code><a href="common-dom-interfaces.html#htmlcollection">HTMLCollection</a></code> rooted at the <code><a href="infrastructure.html#document">Document</a></code> node, whose filter matches only elements that <a href="#concept-command" title="concept-command">define commands</a> and have <a href="#command-facet-id" title="command-facet-ID">IDs</a>. </div><hr>User agents may expose the <a href="#concept-command" title="concept-command">commands</a> whose <a href="#command-facet-hiddenstate" title="command-facet-HiddenState">Hidden State</a> facet is false (visible), e.g. in the user agent's menu bar. User agents are encouraged to do this especially for commands that have <a href="#command-facet-accesskey" title="command-facet-AccessKey">Access Keys</a>, as a way to advertise those keys to the user.<div class="impl"> <h5 id="using-the-a-element-to-define-a-command">4.11.5.1 <dfn title="a-command">Using the <code>a</code> element to define a command</dfn></h5> An <code><a href="text-level-semantics.html#the-a-element">a</a></code> element with an <code title="attr-hyperlink-href"><a href="links.html#attr-hyperlink-href">href</a></code> attribute <a href="#concept-command" title="concept-command">defines a command</a>. The <a href="#command-facet-type" title="command-facet-Type">Type</a> of the command is "command". The <a href="#command-facet-id" title="command-facet-ID">ID</a> of the command is the value of the <code title="attr-id"><a href="elements.html#the-id-attribute">id</a></code> attribute of the element, if the attribute is present and not empty. Otherwise the command is an <a href="#anonymous-command">anonymous command</a>. The <a href="#command-facet-label" title="command-facet-Label">Label</a> of the command is the string given by the element's <code><a href="infrastructure.html#textcontent">textContent</a></code> IDL attribute. The <a href="#command-facet-hint" title="command-facet-Hint">Hint</a> of the command is the value of the <code title="attr-title"><a href="elements.html#the-title-attribute">title</a></code> attribute of the element. If the attribute is not present, the <a href="#command-facet-hint" title="command-facet-Hint">Hint</a> is the empty string. The <a href="#command-facet-icon" title="command-facet-Icon">Icon</a> of the command is the <a href="urls.html#absolute-url">absolute URL</a> obtained from <a href="urls.html#resolve-a-url" title="resolve a url">resolving</a> the value of the <code title="attr-img-src"><a href="embedded-content-1.html#attr-img-src">src</a></code> attribute of the first <code><a href="embedded-content-1.html#the-img-element">img</a></code> element descendant of the element, relative to that element, if there is such an element and resolving its attribute is successful. Otherwise, there is no <a href="#command-facet-icon" title="command-facet-Icon">Icon</a> for the command. The <a href="#command-facet-accesskey" title="command-facet-AccessKey">AccessKey</a> of the command is the element's <a href="editing.html#assigned-access-key">assigned access key</a>, if any. The <a href="#command-facet-hiddenstate" title="command-facet-HiddenState">Hidden State</a> of the command is true (hidden) if the element has a <code title="attr-hidden"><a href="editing.html#the-hidden-attribute">hidden</a></code> attribute, and false otherwise. The <a href="#command-facet-disabledstate" title="command-facet-DisabledState">Disabled State</a> facet of the command is always false. (The command is always enabled.) The <a href="#command-facet-checkedstate" title="command-facet-CheckedState">Checked State</a> of the command is always false. (The command is never checked.) The <a href="#command-facet-action" title="command-facet-Action">Action</a> of the command is to <a href="webappapis.html#fire-a-click-event" title="fire a click event">fire a <code title="event-click">click</code> event</a> at the element. <h5 id="using-the-button-element-to-define-a-command">4.11.5.2 <dfn title="button-command">Using the <code>button</code> element to define a command</dfn></h5> A <code><a href="the-button-element.html#the-button-element">button</a></code> element always <a href="#concept-command" title="concept-command">defines a command</a>. The <a href="#command-facet-type" title="command-facet-Type">Type</a>, <a href="#command-facet-id" title="command-facet-ID">ID</a>, <a href="#command-facet-label" title="command-facet-Label">Label</a>, <a href="#command-facet-hint" title="command-facet-Hint">Hint</a>, <a href="#command-facet-icon" title="command-facet-Icon">Icon</a>, <a href="#command-facet-accesskey" title="command-facet-AccessKey">Access Key</a>, <a href="#command-facet-hiddenstate" title="command-facet-HiddenState">Hidden State</a>, <a href="#command-facet-checkedstate" title="command-facet-CheckedState">Checked State</a>, and <a href="#command-facet-action" title="command-facet-Action">Action</a> facets of the command are determined <a href="#using-the-a-element-to-define-a-command" title="a-command">as for <code>a</code> elements</a> (see the previous section). The <a href="#command-facet-disabledstate" title="command-facet-DisabledState">Disabled State</a> of the command mirrors the <a href="association-of-controls-and-forms.html#concept-fe-disabled" title="concept-fe-disabled">disabled</a> state of the button. <h5 id="using-the-input-element-to-define-a-command">4.11.5.3 <dfn title="input-command">Using the <code>input</code> element to define a command</dfn></h5> An <code><a href="the-input-element.html#the-input-element">input</a></code> element whose <code title="attr-input-type"><a href="the-input-element.html#attr-input-type">type</a></code> attribute is in one of the <a href="number-state.html#submit-button-state" title="attr-input-type-submit">Submit Button</a>, <a href="number-state.html#reset-button-state" title="attr-input-type-reset">Reset Button</a>, <a href="number-state.html#image-button-state" title="attr-input-type-image">Image Button</a>, <a href="number-state.html#button-state" title="attr-input-type-button">Button</a>, <a href="number-state.html#radio-button-state" title="attr-input-type-radio">Radio Button</a>, or <a href="number-state.html#checkbox-state" title="attr-input-type-checkbox">Checkbox</a> states <a href="#concept-command" title="concept-command">defines a command</a>. The <a href="#command-facet-type" title="command-facet-Type">Type</a> of the command is "radio" if the <code title="attr-input-type"><a href="the-input-element.html#attr-input-type">type</a></code> attribute is in the <code title="attr-input-type-radio"><a href="number-state.html#radio-button-state">Radio Button</a></code> state, "checkbox" if the <code title="attr-input-type"><a href="the-input-element.html#attr-input-type">type</a></code> attribute is in the <code title="attr-input-type-checkbox"><a href="number-state.html#checkbox-state">Checkbox</a></code> state, and "command" otherwise. The <a href="#command-facet-id" title="command-facet-ID">ID</a> of the command is the value of the <code title="attr-id"><a href="elements.html#the-id-attribute">id</a></code> attribute of the element, if the attribute is present and not empty. Otherwise the command is an <a href="#anonymous-command">anonymous command</a>. The <a href="#command-facet-label" title="command-facet-Label">Label</a> of the command depends on the Type of the command: If the <a href="#command-facet-type" title="command-facet-Type">Type</a> is "command", then it is the string given by the <code title="attr-input-value"><a href="the-input-element.html#attr-input-value">value</a></code> attribute, if any, and a UA-dependent, locale-dependent value that the UA uses to label the button itself if the attribute is absent. Otherwise, the <a href="#command-facet-type" title="command-facet-Type">Type</a> is "radio" or "checkbox". If the element is a <a href="forms.html#labeled-control">labeled control</a>, the <code><a href="infrastructure.html#textcontent">textContent</a></code> of the first <code><a href="forms.html#the-label-element">label</a></code> element in <a href="infrastructure.html#tree-order">tree order</a> whose <a href="forms.html#labeled-control">labeled control</a> is the element in question is the <a href="#command-facet-label" title="command-facet-Label">Label</a> (in DOM terms, this is the string given by <code><var title="">element</var>.labels[0].textContent</code>). Otherwise, the value of the <code title="attr-input-value"><a href="the-input-element.html#attr-input-value">value</a></code> attribute, if present, is the <a href="#command-facet-label" title="command-facet-Label">Label</a>. Otherwise, the <a href="#command-facet-label" title="command-facet-Label">Label</a> is the empty string. The <a href="#command-facet-hint" title="command-facet-Hint">Hint</a> of the command is the value of the <code title="attr-title"><a href="elements.html#the-title-attribute">title</a></code> attribute of the <code><a href="the-input-element.html#the-input-element">input</a></code> element. If the attribute is not present, the <a href="#command-facet-hint" title="command-facet-Hint">Hint</a> is the empty string. If the element's <code title="attr-input-type"><a href="the-input-element.html#attr-input-type">type</a></code> attribute is in the <a href="number-state.html#image-button-state" title="attr-input-type-image">Image Button</a> state, and the element has a <code title="attr-img-src"><a href="embedded-content-1.html#attr-img-src">src</a></code> attribute, and that attribute's value can be successfully <a href="urls.html#resolve-a-url" title="resolve a url">resolved</a> relative to the element, then the <a href="#command-facet-icon" title="command-facet-Icon">Icon</a> of the command is the <a href="urls.html#absolute-url">absolute URL</a> obtained from resolving that attribute that way. Otherwise, there is no <a href="#command-facet-icon" title="command-facet-Icon">Icon</a> for the command. The <a href="#command-facet-accesskey" title="command-facet-AccessKey">AccessKey</a> of the command is the element's <a href="editing.html#assigned-access-key">assigned access key</a>, if any. The <a href="#command-facet-hiddenstate" title="command-facet-HiddenState">Hidden State</a> of the command is true (hidden) if the element has a <code title="attr-hidden"><a href="editing.html#the-hidden-attribute">hidden</a></code> attribute, and false otherwise. The <a href="#command-facet-disabledstate" title="command-facet-DisabledState">Disabled State</a> of the command mirrors the <a href="association-of-controls-and-forms.html#concept-fe-disabled" title="concept-fe-disabled">disabled</a> state of the control. The <a href="#command-facet-checkedstate" title="command-facet-CheckedState">Checked State</a> of the command is true if the command is of <a href="#command-facet-type" title="command-facet-Type">Type</a> "radio" or "checkbox" and the element is <a href="association-of-controls-and-forms.html#concept-fe-checked" title="concept-fe-checked">checked</a> attribute, and false otherwise. The <a href="#command-facet-action" title="command-facet-Action">Action</a> of the command, if the element has a defined <a href="content-models.html#activation-behavior">activation behavior</a>, is to <a href="content-models.html#run-synthetic-click-activation-steps">run synthetic click activation steps</a> on the element. Otherwise, it is just to <a href="webappapis.html#fire-a-click-event">fire a <code title="event-click">click</code> event</a> at the element. <h5 id="using-the-option-element-to-define-a-command">4.11.5.4 <dfn title="option-command">Using the <code>option</code> element to define a command</dfn></h5> An <code><a href="the-button-element.html#the-option-element">option</a></code> element with an ancestor <code><a href="the-button-element.html#the-select-element">select</a></code> element and either no <code title="attr-option-value"><a href="the-button-element.html#attr-option-value">value</a></code> attribute or a <code title="attr-option-value"><a href="the-button-element.html#attr-option-value">value</a></code> attribute that is not the empty string <a href="#concept-command" title="concept-command">defines a command</a>. The <a href="#command-facet-type" title="command-facet-Type">Type</a> of the command is "radio" if the <code><a href="the-button-element.html#the-option-element">option</a></code>'s nearest ancestor <code><a href="the-button-element.html#the-select-element">select</a></code> element has no <code title="attr-select-multiple"><a href="the-button-element.html#attr-select-multiple">multiple</a></code> attribute, and "checkbox" if it does. The <a href="#command-facet-id" title="command-facet-ID">ID</a> of the command is the value of the <code title="attr-id"><a href="elements.html#the-id-attribute">id</a></code> attribute of the element, if the attribute is present and not empty. Otherwise the command is an <a href="#anonymous-command">anonymous command</a>. The <a href="#command-facet-label" title="command-facet-Label">Label</a> of the command is the value of the <code><a href="the-button-element.html#the-option-element">option</a></code> element's <code title="attr-option-label"><a href="the-button-element.html#attr-option-label">label</a></code> attribute, if there is one, or the value of the <code><a href="the-button-element.html#the-option-element">option</a></code> element's <code><a href="infrastructure.html#textcontent">textContent</a></code> IDL attribute if there isn't. The <a href="#command-facet-hint" title="command-facet-Hint">Hint</a> of the command is the string given by the element's <code title="attr-title"><a href="elements.html#the-title-attribute">title</a></code> attribute, if any, and the empty string if the attribute is absent. There is no <a href="#command-facet-icon" title="command-facet-Icon">Icon</a> for the command. The <a href="#command-facet-accesskey" title="command-facet-AccessKey">AccessKey</a> of the command is the element's <a href="editing.html#assigned-access-key">assigned access key</a>, if any. The <a href="#command-facet-hiddenstate" title="command-facet-HiddenState">Hidden State</a> of the command is true (hidden) if the element has a <code title="attr-hidden"><a href="editing.html#the-hidden-attribute">hidden</a></code> attribute, and false otherwise. The <a href="#command-facet-disabledstate" title="command-facet-DisabledState">Disabled State</a> of the command is true (disabled) if the element is <a href="the-button-element.html#concept-option-disabled" title="concept-option-disabled">disabled</a> or if its nearest ancestor <code><a href="the-button-element.html#the-select-element">select</a></code> element is <a href="association-of-controls-and-forms.html#concept-fe-disabled" title="concept-fe-disabled">disabled</a>, and false otherwise. The <a href="#command-facet-checkedstate" title="command-facet-CheckedState">Checked State</a> of the command is true (checked) if the element's <a href="the-button-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> is true, and false otherwise. The <a href="#command-facet-action" title="command-facet-Action">Action</a> of the command depends on its <a href="#command-facet-type" title="command-facet-Type">Type</a>. If the command is of <a href="#command-facet-type" title="command-facet-Type">Type</a> "radio" then it must <a href="the-button-element.html#concept-select-pick" title="concept-select-pick">pick</a> the <code><a href="the-button-element.html#the-option-element">option</a></code> element. Otherwise, it must <a href="the-button-element.html#concept-select-toggle" title="concept-select-toggle">toggle</a> the <code><a href="the-button-element.html#the-option-element">option</a></code> element. <h5 id="using-the-command-element-to-define-a-command">4.11.5.5 Using the <dfn title="command-element"><code>command</code></dfn> element to define a command</h5> A <code><a href="interactive-elements.html#the-command-element">command</a></code> element <a href="#concept-command" title="concept-command">defines a command</a>. The <a href="#command-facet-type" title="command-facet-Type">Type</a> of the command is "radio" if the <code><a href="interactive-elements.html#the-command-element">command</a></code>'s <code title="attr-command-type"><a href="interactive-elements.html#attr-command-type">type</a></code> attribute is "<code>radio</code>", "checkbox" if the attribute's value is "<code>checkbox</code>", and "command" otherwise. The <a href="#command-facet-id" title="command-facet-ID">ID</a> of the command is the value of the <code title="attr-id"><a href="elements.html#the-id-attribute">id</a></code> attribute of the element, if the attribute is present and not empty. Otherwise the command is an <a href="#anonymous-command">anonymous command</a>. The <a href="#command-facet-label" title="command-facet-Label">Label</a> of the command is the value of the element's <code title="attr-command-label"><a href="interactive-elements.html#attr-command-label">label</a></code> attribute, if there is one, or the empty string if it doesn't. The <a href="#command-facet-hint" title="command-facet-Hint">Hint</a> of the command is the string given by the element's <code title="attr-command-title"><a href="interactive-elements.html#attr-command-title">title</a></code> attribute, if any, and the empty string if the attribute is absent. The <a href="#command-facet-icon" title="command-facet-Icon">Icon</a> for the command is the <a href="urls.html#absolute-url">absolute URL</a> obtained from <a href="urls.html#resolve-a-url" title="resolve a url">resolving</a> the value of the element's <code title="attr-command-icon"><a href="interactive-elements.html#attr-command-icon">icon</a></code> attribute, relative to the element, if it has such an attribute and resolving it is successful. Otherwise, there is no <a href="#command-facet-icon" title="command-facet-Icon">Icon</a> for the command. The <a href="#command-facet-accesskey" title="command-facet-AccessKey">AccessKey</a> of the command is the element's <a href="editing.html#assigned-access-key">assigned access key</a>, if any. The <a href="#command-facet-hiddenstate" title="command-facet-HiddenState">Hidden State</a> of the command is true (hidden) if the element has a <code title="attr-hidden"><a href="editing.html#the-hidden-attribute">hidden</a></code> attribute, and false otherwise. The <a href="#command-facet-disabledstate" title="command-facet-DisabledState">Disabled State</a> of the command is true (disabled) if the element has a <code title="attr-command-disabled"><a href="interactive-elements.html#attr-command-disabled">disabled</a></code> attribute, and false otherwise. The <a href="#command-facet-checkedstate" title="command-facet-CheckedState">Checked State</a> of the command is true (checked) if the element has a <code title="attr-command-checked"><a href="interactive-elements.html#attr-command-checked">checked</a></code> attribute, and false otherwise. The <a href="#command-facet-action" title="command-facet-Action">Action</a> of the command, if the element has a defined <a href="content-models.html#activation-behavior">activation behavior</a>, is to <a href="content-models.html#run-synthetic-click-activation-steps">run synthetic click activation steps</a> on the element. Otherwise, it is just to <a href="webappapis.html#fire-a-click-event">fire a <code title="event-click">click</code> event</a> at the element. <h5 id="using-the-accesskey-attribute-on-a-label-element-to-define-a-command">4.11.5.6 <dfn title="label-command">Using the <code title="attr-accesskey">accesskey</code> attribute on a <code>label</code> element to define a command</dfn></h5> A <code><a href="forms.html#the-label-element">label</a></code> element that has an <a href="editing.html#assigned-access-key">assigned access key</a> and a <a href="forms.html#labeled-control">labeled control</a> and whose <a href="forms.html#labeled-control">labeled control</a> <a href="#concept-command" title="concept-command">defines a command</a>, itself <a href="#concept-command" title="concept-command">defines a command</a>. The <a href="#command-facet-type" title="command-facet-Type">Type</a> of the command is "command". The <a href="#command-facet-id" title="command-facet-ID">ID</a> of the command is the value of the <code title="attr-id"><a href="elements.html#the-id-attribute">id</a></code> attribute of the element, if the attribute is present and not empty. Otherwise the command is an <a href="#anonymous-command">anonymous command</a>. The <a href="#command-facet-label" title="command-facet-Label">Label</a> of the command is the string given by the element's <code><a href="infrastructure.html#textcontent">textContent</a></code> IDL attribute. The <a href="#command-facet-hint" title="command-facet-Hint">Hint</a> of the command is the value of the <code title="attr-title"><a href="elements.html#the-title-attribute">title</a></code> attribute of the element. There is no <a href="#command-facet-icon" title="command-facet-Icon">Icon</a> for the command. The <a href="#command-facet-accesskey" title="command-facet-AccessKey">AccessKey</a> of the command is the element's <a href="editing.html#assigned-access-key">assigned access key</a>. The <a href="#command-facet-hiddenstate" title="command-facet-HiddenState">Hidden State</a>, <a href="#command-facet-disabledstate" title="command-facet-DisabledState">Disabled State</a>, and <a href="#command-facet-action" title="command-facet-Action">Action</a> facets of the command are the same as the respective facets of the element's <a href="forms.html#labeled-control">labeled control</a>. The <a href="#command-facet-checkedstate" title="command-facet-CheckedState">Checked State</a> of the command is always false. (The command is never checked.) <h5 id="using-the-accesskey-attribute-on-a-legend-element-to-define-a-command">4.11.5.7 <dfn title="legend-command">Using the <code title="attr-accesskey">accesskey</code> attribute on a <code>legend</code> element to define a command</dfn></h5> A <code><a href="forms.html#the-legend-element">legend</a></code> element that has an <a href="editing.html#assigned-access-key">assigned access key</a> and is a child of a <code><a href="forms.html#the-fieldset-element">fieldset</a></code> element that has a descendant that is not a descendant of the <code><a href="forms.html#the-legend-element">legend</a></code> element and is neither a <code><a href="forms.html#the-label-element">label</a></code> element nor a <code><a href="forms.html#the-legend-element">legend</a></code> element but that <a href="#concept-command" title="concept-command">defines a command</a>, itself <a href="#concept-command" title="concept-command">defines a command</a>. The <a href="#command-facet-type" title="command-facet-Type">Type</a> of the command is "command". The <a href="#command-facet-id" title="command-facet-ID">ID</a> of the command is the value of the <code title="attr-id"><a href="elements.html#the-id-attribute">id</a></code> attribute of the element, if the attribute is present and not empty. Otherwise the command is an <a href="#anonymous-command">anonymous command</a>. The <a href="#command-facet-label" title="command-facet-Label">Label</a> of the command is the string given by the element's <code><a href="infrastructure.html#textcontent">textContent</a></code> IDL attribute. The <a href="#command-facet-hint" title="command-facet-Hint">Hint</a> of the command is the value of the <code title="attr-title"><a href="elements.html#the-title-attribute">title</a></code> attribute of the element. There is no <a href="#command-facet-icon" title="command-facet-Icon">Icon</a> for the command. The <a href="#command-facet-accesskey" title="command-facet-AccessKey">AccessKey</a> of the command is the element's <a href="editing.html#assigned-access-key">assigned access key</a>. The <a href="#command-facet-hiddenstate" title="command-facet-HiddenState">Hidden State</a>, <a href="#command-facet-disabledstate" title="command-facet-DisabledState">Disabled State</a>, and <a href="#command-facet-action" title="command-facet-Action">Action</a> facets of the command are the same as the respective facets of the first element in <a href="infrastructure.html#tree-order">tree order</a> that is a descendant of the parent of the <code><a href="forms.html#the-legend-element">legend</a></code> element that <a href="#concept-command" title="concept-command">defines a command</a> but is not a descendant of the <code><a href="forms.html#the-legend-element">legend</a></code> element and is neither a <code><a href="forms.html#the-label-element">label</a></code> nor a <code><a href="forms.html#the-legend-element">legend</a></code> element. The <a href="#command-facet-checkedstate" title="command-facet-CheckedState">Checked State</a> of the command is always false. (The command is never checked.) <h5 id="using-the-accesskey-attribute-to-define-a-command-on-other-elements">4.11.5.8 <dfn title="accesskey-command">Using the <code title="attr-accesskey">accesskey</code> attribute to define a command on other elements</dfn></h5> An element that has an <a href="editing.html#assigned-access-key">assigned access key</a> <a href="#concept-command" title="concept-command">defines a command</a>. If one of the other sections that define elements that <a href="#concept-command" title="concept-command">define commands</a> define that this element <a href="#concept-command" title="concept-command">defines a command</a>, then that section applies to this element, and this section does not. Otherwise, this section applies to that element. The <a href="#command-facet-type" title="command-facet-Type">Type</a> of the command is "command". The <a href="#command-facet-id" title="command-facet-ID">ID</a> of the command is the value of the <code title="attr-id"><a href="elements.html#the-id-attribute">id</a></code> attribute of the element, if the attribute is present and not empty. Otherwise the command is an <a href="#anonymous-command">anonymous command</a>. The <a href="#command-facet-label" title="command-facet-Label">Label</a> of the command depends on the element. If the element is a <a href="forms.html#labeled-control">labeled control</a>, the <code><a href="infrastructure.html#textcontent">textContent</a></code> of the first <code><a href="forms.html#the-label-element">label</a></code> element in <a href="infrastructure.html#tree-order">tree order</a> whose <a href="forms.html#labeled-control">labeled control</a> is the element in question is the <a href="#command-facet-label" title="command-facet-Label">Label</a> (in DOM terms, this is the string given by <code><var title="">element</var>.labels[0].textContent</code>). Otherwise, the <a href="#command-facet-label" title="command-facet-Label">Label</a> is the <code><a href="infrastructure.html#textcontent">textContent</a></code> of the element itself. The <a href="#command-facet-hint" title="command-facet-Hint">Hint</a> of the command is the value of the <code title="attr-title"><a href="elements.html#the-title-attribute">title</a></code> attribute of the element. If the attribute is not present, the <a href="#command-facet-hint" title="command-facet-Hint">Hint</a> is the empty string. There is no <a href="#command-facet-icon" title="command-facet-Icon">Icon</a> for the command. The <a href="#command-facet-accesskey" title="command-facet-AccessKey">AccessKey</a> of the command is the element's <a href="editing.html#assigned-access-key">assigned access key</a>. The <a href="#command-facet-hiddenstate" title="command-facet-HiddenState">Hidden State</a> of the command is true (hidden) if the element has a <code title="attr-hidden"><a href="editing.html#the-hidden-attribute">hidden</a></code> attribute, and false otherwise. The <a href="#command-facet-disabledstate" title="command-facet-DisabledState">Disabled State</a> facet of the command is always false. (The command is always enabled.) The <a href="#command-facet-checkedstate" title="command-facet-CheckedState">Checked State</a> of the command is always false. (The command is never checked.) The <a href="#command-facet-action" title="command-facet-Action">Action</a> of the command is to run the following steps: <ol><li>If the element is <a href="editing.html#focusable">focusable</a>, run the <a href="editing.html#focusing-steps">focusing steps</a> for the element.</li> <li>If the element has a defined <a href="content-models.html#activation-behavior">activation behavior</a>, <a href="content-models.html#run-synthetic-click-activation-steps">run synthetic click activation steps</a> on the element.</li> <li>Otherwise, if the element does not have a defined <a href="content-models.html#activation-behavior">activation behavior</a>, <a href="webappapis.html#fire-a-click-event">fire a <code title="event-click">click</code> event</a> at the element.</li> </ol></div></body></html>