<!DOCTYPE html><html lang="en-US-x-Hixie"><meta charset="utf-8"><title>4.10.8 The button element — HTML5</title><style type="text/css">
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<h1>HTML5</h1>
<h2 class="no-num no-toc" id="a-vocabulary-and-associated-apis-for-html-and-xhtml">A vocabulary and associated APIs for HTML and XHTML</h2>
<h2 class="no-num no-toc" id="editor's-draft-date-1-january-1970">Editor's Draft 21 November 2012</h2>
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<h4 id="the-button-element"><span class="secno">4.10.8 </span>The <dfn><code>button</code></dfn> element</h4>
<dl class="element"><dt><a href="element-definitions.html#element-dfn-categories" title="element-dfn-categories">Categories</a>:</dt>
<dd><a href="content-models.html#flow-content-1">Flow content</a>.</dd>
<dd><a href="content-models.html#phrasing-content-1">Phrasing content</a>.</dd>
<dd><a href="content-models.html#interactive-content-0">Interactive content</a>.</dd>
<dd><a href="forms.html#category-listed" title="category-listed">Listed</a>, <a href="forms.html#category-label" title="category-label">labelable</a>, and <a href="forms.html#category-submit" title="category-submit">submittable</a> <a href="forms.html#form-associated-element">form-associated element</a>.</dd>
<dd><a href="content-models.html#palpable-content-0">Palpable content</a>.</dd>
<dt><a href="element-definitions.html#element-dfn-contexts" title="element-dfn-contexts">Contexts in which this element can be used</a>:</dt>
<dd>Where <a href="content-models.html#phrasing-content-1">phrasing content</a> is expected.</dd>
<dt><a href="element-definitions.html#element-dfn-content-model" title="element-dfn-content-model">Content model</a>:</dt>
<dd><a href="content-models.html#phrasing-content-1">Phrasing content</a>, but there must be no <a href="content-models.html#interactive-content-0">interactive content</a> descendant.</dd>
<dt><a href="element-definitions.html#element-dfn-attributes" title="element-dfn-attributes">Content attributes</a>:</dt>
<dd><a href="global-attributes.html#global-attributes">Global attributes</a></dd>
<dd><code title="attr-fe-autofocus"><a href="attributes-common-to-form-controls.html#attr-fe-autofocus">autofocus</a></code></dd>
<dd><code title="attr-fe-disabled"><a href="attributes-common-to-form-controls.html#attr-fe-disabled">disabled</a></code></dd>
<dd><code title="attr-fae-form"><a href="association-of-controls-and-forms.html#attr-fae-form">form</a></code></dd>
<dd><code title="attr-fs-formaction"><a href="form-submission.html#attr-fs-formaction">formaction</a></code></dd>
<dd><code title="attr-fs-formenctype"><a href="form-submission.html#attr-fs-formenctype">formenctype</a></code></dd>
<dd><code title="attr-fs-formmethod"><a href="form-submission.html#attr-fs-formmethod">formmethod</a></code></dd>
<dd><code title="attr-fs-formnovalidate"><a href="form-submission.html#attr-fs-formnovalidate">formnovalidate</a></code></dd>
<dd><code title="attr-fs-formtarget"><a href="form-submission.html#attr-fs-formtarget">formtarget</a></code></dd>
<dd><code title="attr-fe-name"><a href="attributes-common-to-form-controls.html#attr-fe-name">name</a></code></dd>
<dd><code title="attr-button-type"><a href="#attr-button-type">type</a></code></dd>
<dd><code title="attr-button-value"><a href="#attr-button-value">value</a></code></dd>
<dt><a href="element-definitions.html#element-dfn-dom" title="element-dfn-dom">DOM interface</a>:</dt><!--TOPIC:DOM APIs-->
<dd>
<pre class="idl">interface <dfn id="htmlbuttonelement">HTMLButtonElement</dfn> : <a href="elements.html#htmlelement">HTMLElement</a> {
attribute boolean <a href="attributes-common-to-form-controls.html#dom-fe-autofocus" title="dom-fe-autofocus">autofocus</a>;
attribute boolean <a href="attributes-common-to-form-controls.html#dom-fe-disabled" title="dom-fe-disabled">disabled</a>;
readonly attribute <a href="the-form-element.html#htmlformelement">HTMLFormElement</a>? <a href="association-of-controls-and-forms.html#dom-fae-form" title="dom-fae-form">form</a>;
attribute DOMString <a href="form-submission.html#dom-fs-formaction" title="dom-fs-formAction">formAction</a>;
attribute DOMString <a href="form-submission.html#dom-fs-formenctype" title="dom-fs-formEnctype">formEnctype</a>;
attribute DOMString <a href="form-submission.html#dom-fs-formmethod" title="dom-fs-formMethod">formMethod</a>;
attribute boolean <a href="form-submission.html#dom-fs-formnovalidate" title="dom-fs-formNoValidate">formNoValidate</a>;
attribute DOMString <a href="form-submission.html#dom-fs-formtarget" title="dom-fs-formTarget">formTarget</a>;
attribute DOMString <a href="attributes-common-to-form-controls.html#dom-fe-name" title="dom-fe-name">name</a>;
attribute DOMString <a href="#dom-button-type" title="dom-button-type">type</a>;
attribute DOMString <a href="#dom-button-value" title="dom-button-value">value</a>;
readonly attribute boolean <a href="constraints.html#dom-cva-willvalidate" title="dom-cva-willValidate">willValidate</a>;
readonly attribute <a href="constraints.html#validitystate">ValidityState</a> <a href="constraints.html#dom-cva-validity" title="dom-cva-validity">validity</a>;
readonly attribute DOMString <a href="constraints.html#dom-cva-validationmessage" title="dom-cva-validationMessage">validationMessage</a>;
boolean <a href="constraints.html#dom-cva-checkvalidity" title="dom-cva-checkValidity">checkValidity</a>();
void <a href="constraints.html#dom-cva-setcustomvalidity" title="dom-cva-setCustomValidity">setCustomValidity</a>(DOMString error);
readonly attribute <a href="infrastructure.html#nodelist">NodeList</a> <a href="the-label-element.html#dom-lfe-labels" title="dom-lfe-labels">labels</a>;
};</pre>
</dd>
</dl><!--TOPIC:HTML--><p>The <code><a href="#the-button-element">button</a></code> element <a href="rendering.html#represents">represents</a> a button labeled by its contents.</p>
<p>The element is a <a href="forms.html#concept-button" title="concept-button">button</a>.</p>
<p>The <dfn id="attr-button-type" title="attr-button-type"><code>type</code></dfn>
attribute controls the behavior of the button when it is activated.
It is an <a href="common-microsyntaxes.html#enumerated-attribute">enumerated attribute</a>. The following table
lists the keywords and states for the attribute — the keywords
in the left column map to the states in the cell in the second
column on the same row as the keyword.</p>
<table><thead><tr><th> Keyword
<th> State
<th> Brief description
<tbody><tr><td><dfn id="attr-button-type-submit" title="attr-button-type-submit"><code>submit</code></dfn>
<td><a href="#attr-button-type-submit-state" title="attr-button-type-submit-state">Submit Button</a>
<td>Submits the form.
<tr><td><dfn id="attr-button-type-reset" title="attr-button-type-reset"><code>reset</code></dfn>
<td><a href="#attr-button-type-reset-state" title="attr-button-type-reset-state">Reset Button</a>
<td>Resets the form.
<tr><td><dfn id="attr-button-type-button" title="attr-button-type-button"><code>button</code></dfn>
<td><a href="#attr-button-type-button-state" title="attr-button-type-button-state">Button</a>
<td>Does nothing.
</table><p>The <i>missing value default</i> is the <a href="#attr-button-type-submit-state" title="attr-button-type-submit-state">Submit Button</a>
state.</p>
<p>If the <code title="attr-button-type"><a href="#attr-button-type">type</a></code> attribute is in
the <a href="#attr-button-type-submit-state" title="attr-button-type-submit-state">Submit Button</a>
state, the element is specifically a <a href="forms.html#concept-submit-button" title="concept-submit-button">submit button</a>.</p>
<div class="impl">
<p><strong>Constraint validation</strong>: If the <code title="attr-button-type"><a href="#attr-button-type">type</a></code> attribute is in the <a href="#attr-button-type-reset-state" title="attr-button-type-reset-state">Reset Button</a> state or
the <a href="#attr-button-type-button-state" title="attr-button-type-button-state">Button</a> state,
the element is <a href="constraints.html#barred-from-constraint-validation">barred from constraint validation</a>.</p>
<p>When a <code><a href="#the-button-element">button</a></code> element is not <a href="attributes-common-to-form-controls.html#concept-fe-disabled" title="concept-fe-disabled">disabled</a>, its <a href="content-models.html#activation-behavior">activation
behavior</a> element is to run the steps defined in the following
list for the current state of the element's <code title="attr-button-type"><a href="#attr-button-type">type</a></code> attribute:</p>
<dl><dt> <dfn id="attr-button-type-submit-state" title="attr-button-type-submit-state">Submit Button</dfn> </dt>
<dd><p>If the element has a <a href="association-of-controls-and-forms.html#form-owner">form owner</a>, the element
must <a href="constraints.html#concept-form-submit" title="concept-form-submit">submit</a> the <a href="association-of-controls-and-forms.html#form-owner">form
owner</a> from the <code><a href="#the-button-element">button</a></code> element.</dd>
<dt> <dfn id="attr-button-type-reset-state" title="attr-button-type-reset-state">Reset Button</dfn> </dt>
<dd><p>If the element has a <a href="association-of-controls-and-forms.html#form-owner">form owner</a>, the element
must <a href="constraints.html#concept-form-reset" title="concept-form-reset">reset</a> the <a href="association-of-controls-and-forms.html#form-owner">form
owner</a>.</dd>
<dt> <dfn id="attr-button-type-button-state" title="attr-button-type-button-state">Button</dfn>
<dd><p>Do nothing.</dd>
</dl></div>
<p>The <code title="attr-fae-form"><a href="association-of-controls-and-forms.html#attr-fae-form">form</a></code> attribute is used to
explicitly associate the <code><a href="#the-button-element">button</a></code> element with its
<a href="association-of-controls-and-forms.html#form-owner">form owner</a>. The <code title="attr-fe-name"><a href="attributes-common-to-form-controls.html#attr-fe-name">name</a></code>
attribute represents the element's name. The <code title="attr-fe-disabled"><a href="attributes-common-to-form-controls.html#attr-fe-disabled">disabled</a></code> attribute is used to make
the control non-interactive and to prevent its value from being
submitted. The <code title="attr-fe-autofocus"><a href="attributes-common-to-form-controls.html#attr-fe-autofocus">autofocus</a></code>
attribute controls focus. The <code title="attr-fs-formaction"><a href="form-submission.html#attr-fs-formaction">formaction</a></code>, <code title="attr-fs-formenctype"><a href="form-submission.html#attr-fs-formenctype">formenctype</a></code>, <code title="attr-fs-formmethod"><a href="form-submission.html#attr-fs-formmethod">formmethod</a></code>, <code title="attr-fs-formnovalidate"><a href="form-submission.html#attr-fs-formnovalidate">formnovalidate</a></code>, and <code title="attr-fs-formtarget"><a href="form-submission.html#attr-fs-formtarget">formtarget</a></code> attributes are
<a href="form-submission.html#attributes-for-form-submission">attributes for form submission</a>.</p>
<p class="note">The <code title="attr-fs-formnovalidate"><a href="form-submission.html#attr-fs-formnovalidate">formnovalidate</a></code> attribute can
be used to make submit buttons that do not trigger the constraint
validation.</p>
<p>The <code title="attr-fs-formaction"><a href="form-submission.html#attr-fs-formaction">formaction</a></code>, <code title="attr-fs-formenctype"><a href="form-submission.html#attr-fs-formenctype">formenctype</a></code>, <code title="attr-fs-formmethod"><a href="form-submission.html#attr-fs-formmethod">formmethod</a></code>, <code title="attr-fs-formnovalidate"><a href="form-submission.html#attr-fs-formnovalidate">formnovalidate</a></code>, and <code title="attr-fs-formtarget"><a href="form-submission.html#attr-fs-formtarget">formtarget</a></code> must not be specified
if the element's <code title="attr-button-type"><a href="#attr-button-type">type</a></code>
attribute is not in the <a href="#attr-button-type-submit-state" title="attr-button-type-submit-state">Submit Button</a>
state.</p>
<p>The <dfn id="attr-button-value" title="attr-button-value"><code>value</code></dfn>
attribute gives the element's value for the purposes of form
submission. The element's <a href="attributes-common-to-form-controls.html#concept-fe-value" title="concept-fe-value">value</a> is the value of the element's
<code title="attr-button-value"><a href="#attr-button-value">value</a></code> attribute, if there is
one, or the empty string otherwise.</p>
<p class="note">A button (and its value) is only included in the
form submission if the button itself was used to initiate the form
submission.</p>
<div class="impl">
<p>The <dfn id="dom-button-value" title="dom-button-value"><code>value</code></dfn> IDL
attribute must <a href="common-dom-interfaces.html#reflect">reflect</a> the content attribute of the
same name.</p>
<p>The <dfn id="dom-button-type" title="dom-button-type"><code>type</code></dfn> IDL
attribute must <a href="common-dom-interfaces.html#reflect">reflect</a> the content attribute of the
same name, <a href="common-dom-interfaces.html#limited-to-only-known-values">limited to only known values</a>.</p>
<p>The <code title="dom-cva-willValidate"><a href="constraints.html#dom-cva-willvalidate">willValidate</a></code>, <code title="dom-cva-validity"><a href="constraints.html#dom-cva-validity">validity</a></code>, and <code title="dom-cva-validationMessage"><a href="constraints.html#dom-cva-validationmessage">validationMessage</a></code> IDL
attributes, and the <code title="dom-cva-checkValidity"><a href="constraints.html#dom-cva-checkvalidity">checkValidity()</a></code> and <code title="dom-cva-setCustomValidity"><a href="constraints.html#dom-cva-setcustomvalidity">setCustomValidity()</a></code>
methods, are part of the <a href="constraints.html#the-constraint-validation-api">constraint validation API</a>. The
<code title="dom-lfe-labels"><a href="the-label-element.html#dom-lfe-labels">labels</a></code> IDL attribute provides a
list of the element's <code><a href="the-label-element.html#the-label-element">label</a></code>s. The <code title="dom-fe-autofocus"><a href="attributes-common-to-form-controls.html#dom-fe-autofocus">autofocus</a></code>, <code title="dom-fe-disabled"><a href="attributes-common-to-form-controls.html#dom-fe-disabled">disabled</a></code>, <code title="dom-fae-form"><a href="association-of-controls-and-forms.html#dom-fae-form">form</a></code>, and <code title="dom-fe-name"><a href="attributes-common-to-form-controls.html#dom-fe-name">name</a></code> IDL attributes are part of the
element's forms API.</p>
</div>
<div class="example">
<p>The following button is labeled "Show hint" and pops up a dialog
box when activated:</p>
<pre><button type=button
onclick="alert('This 15-20 minute piece was composed by George Gershwin.')">
Show hint
</button></pre>
</div>
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