Edition for Web Developers — Last Updated 5 December 2024
button
elementSupport in all current engines.
tabindex
attribute
specified.disabled
— Whether the form control is disabled
form
— Associates the element with a form
element
formaction
— URL to use for form submission
formenctype
— Entry list encoding type to use for form submission
formmethod
— Variant to use for form submission
formnovalidate
— Bypass form control validation for form submission
formtarget
— Navigable for form submission
name
— Name of the element to use for form submission and in the form.elements
API
popovertarget
— Targets a popover element to toggle, show, or hide
popovertargetaction
— Indicates whether a targeted popover element is to be toggled, shown, or hidden
type
— Type of button
value
— Value to be used for form submission
HTMLButtonElement
.The button
element represents a button labeled by its contents.
The element is a button.
The type
attribute
controls the behavior of the button when it is activated. It is an enumerated
attribute with the following keywords and states:
Keyword | State | Brief description |
---|---|---|
submit
| Submit Button | Submits the form. |
reset
| Reset Button | Resets the form. |
button
| Button | Does nothing. |
The attribute's missing value default and invalid value default are both the Submit Button state.
If the type
attribute is in the Submit Button state, the element is specifically a
submit button.
The form
attribute is used to explicitly associate the
button
element with its form owner. The name
attribute represents the element's name. The disabled
attribute is used to make the control non-interactive and
to prevent its value from being submitted. The formaction
,
formenctype
, formmethod
, formnovalidate
, and formtarget
attributes are attributes for form
submission.
The formnovalidate
attribute can be
used to make submit buttons that do not trigger the constraint validation.
The formaction
, formenctype
, formmethod
, formnovalidate
, and formtarget
must not be specified if the element's type
attribute is not in the Submit Button state.
The value
attribute gives the element's value for the purposes of form submission. The element's value is the value of the element's value
attribute, if there is one, or the empty string
otherwise.
A button (and its value) is only included in the form submission if the button itself was used to initiate the form submission.
The following button is labeled "Show hint" and pops up a dialog box when activated:
< button type = button
onclick = "alert('This 15-20 minute piece was composed by George Gershwin.')" >
Show hint
</ button >
select
elementSupport in all current engines.
option
, optgroup
, hr
, and script-supporting elements.autocomplete
— Hint for form autofill feature
disabled
— Whether the form control is disabled
form
— Associates the element with a form
element
multiple
— Whether to allow multiple values
name
— Name of the element to use for form submission and in the form.elements
API
required
— Whether the control is required for form submission
size
— Size of the control
multiple
attribute or a size
attribute with a value > 1: for authors; for implementers.HTMLSelectElement
.The select
element represents a control for selecting amongst a set of
options.
Support in all current engines.
The multiple
attribute is a boolean attribute. If the attribute is present, then the
select
element represents a control for selecting zero or more options
from the list of options. If the attribute is
absent, then the select
element represents a control for selecting a
single option from the list of options.
Support in all current engines.
The size
attribute
gives the number of options to show to the user. The size
attribute, if specified, must have a value that is a valid non-negative integer
greater than zero.
The list of options for a select
element consists of all the option
element children of the select
element, and all the option
element children of all the optgroup
element
children of the select
element, in tree order.
Support in all current engines.
The required
attribute is a boolean attribute. When specified, the user will be required to select
a value before submitting the form.
If a select
element has a required
attribute specified, does not have a multiple
attribute
specified, and has a display size of 1; and if the value of the first option
element in the
select
element's list of options (if
any) is the empty string, and that option
element's parent node is the
select
element (and not an optgroup
element), then that
option
is the select
element's placeholder label option.
If a select
element has a required
attribute specified, does not have a multiple
attribute
specified, and has a display size of 1, then the
select
element must have a placeholder label option.
In practice, the requirement stated in the paragraph above can only apply when a
select
element does not have a size
attribute
with a value greater than 1.
The form
attribute is used to explicitly associate the select
element with its form owner.
The name
attribute represents the element's name.
The disabled
attribute is used to make the control non-interactive and to prevent its value from being submitted.
The autocomplete
attribute controls how the user agent provides autofill behavior.
A select
element that is not disabled is
mutable.
select.type
Returns "select-multiple
" if the element has a multiple
attribute, and "select-one
"
otherwise.
select.options
Returns an HTMLOptionsCollection
of the list of options.
select.length [ = value ]
Returns the number of elements in the list of options.
When set to a smaller number, truncates the number of option
elements in the
select
.
When set to a greater number, adds new blank option
elements to the
select
.
element = select.item(index)
select[index]
Returns the item with index index from the list of options. The items are sorted in tree order.
element = select.namedItem(name)
Returns the first item with ID or name
name from the list of options.
Returns null if no element with that ID could be found.
select.add(element [, before ])
Inserts element before the node given by before.
The before argument can be a number, in which case element is inserted before the item with that number, or an element from the list of options, in which case element is inserted before that element.
If before is omitted, null, or a number out of range, then element will be added at the end of the list.
This method will throw a "HierarchyRequestError
"
DOMException
if element is an ancestor of the element into which it is
to be inserted.
select.selectedOptions
Returns an HTMLCollection
of the list
of options that are selected.
select.selectedIndex [ = value ]
Returns the index of the first selected item, if any, or −1 if there is no selected item.
Can be set, to change the selection.
select.value [ = value ]
Returns the value of the first selected item, if any, or the empty string if there is no selected item.
Can be set, to change the selection.
select.showPicker()
Shows any applicable picker UI for select, so that the user can select a value.
Throws an "InvalidStateError
" DOMException
if
select is not mutable.
Throws a "NotAllowedError
" DOMException
if called
without transient user activation.
Throws a "SecurityError
" DOMException
if
select is inside a cross-origin iframe
.
Throws a "NotSupportedError
" DOMException
if
select is not being rendered.
The following example shows how a select
element can be used to offer the user
with a set of options from which the user can select a single option. The default option is
preselected.
< p >
< label for = "unittype" > Select unit type:</ label >
< select id = "unittype" name = "unittype" >
< option value = "1" > Miner </ option >
< option value = "2" > Puffer </ option >
< option value = "3" selected > Snipey </ option >
< option value = "4" > Max </ option >
< option value = "5" > Firebot </ option >
</ select >
</ p >
When there is no default option, a placeholder can be used instead:
< select name = "unittype" required >
< option value = "" > Select unit type </ option >
< option value = "1" > Miner </ option >
< option value = "2" > Puffer </ option >
< option value = "3" > Snipey </ option >
< option value = "4" > Max </ option >
< option value = "5" > Firebot </ option >
</ select >
Here, the user is offered a set of options from which they can select any number. By default, all five options are selected.
< p >
< label for = "allowedunits" > Select unit types to enable on this map:</ label >
< select id = "allowedunits" name = "allowedunits" multiple >
< option value = "1" selected > Miner </ option >
< option value = "2" selected > Puffer </ option >
< option value = "3" selected > Snipey </ option >
< option value = "4" selected > Max </ option >
< option value = "5" selected > Firebot </ option >
</ select >
</ p >
Sometimes, a user has to select one or more items. This example shows such an interface.
< label >
Select the songs from that you would like on your Act II Mix Tape:
< select multiple required name = "act2" >
< option value = "s1" > It Sucks to Be Me (Reprise)
< option value = "s2" > There is Life Outside Your Apartment
< option value = "s3" > The More You Ruv Someone
< option value = "s4" > Schadenfreude
< option value = "s5" > I Wish I Could Go Back to College
< option value = "s6" > The Money Song
< option value = "s7" > School for Monsters
< option value = "s8" > The Money Song (Reprise)
< option value = "s9" > There's a Fine, Fine Line (Reprise)
< option value = "s10" > What Do You Do With a B.A. in English? (Reprise)
< option value = "s11" > For Now
</ select >
</ label >
Occasionally it can be useful to have a separator:
< label >
Select the song to play next:
< select required name = "next" >
< option value = "sr" > Random
< hr >
< option value = "s1" > It Sucks to Be Me (Reprise)
< option value = "s2" > There is Life Outside Your Apartment
…
datalist
elementoption
and script-supporting elements.HTMLDataListElement
.The datalist
element represents a set of option
elements that
represent predefined options for other controls. In the rendering, the datalist
element represents nothing.
The datalist
element can be used in two ways. In the simplest case, the
datalist
element has just option
element children.
< label >
Animal:
< input name = animal list = animals >
< datalist id = animals >
< option value = "Cat" >
< option value = "Dog" >
</ datalist >
</ label >
In the more elaborate case, the datalist
element can be given contents that are to
be displayed for down-level clients that don't support datalist
. In this case, the
option
elements are provided inside a select
element inside the
datalist
element.
< label >
Animal:
< input name = animal list = animals >
</ label >
< datalist id = animals >
< label >
or select from the list:
< select name = animal >
< option value = "" >
< option > Cat
< option > Dog
</ select >
</ label >
</ datalist >
The datalist
element is hooked up to an input
element using the list
attribute on the input
element.
Each option
element that is a descendant of the datalist
element,
that is not disabled, and whose value is a string that isn't the empty string, represents a
suggestion. Each suggestion has a value and a label.
datalist.options
Returns an HTMLCollection
of the option
elements of the
datalist
element.
optgroup
elementSupport in all current engines.
select
element.option
and script-supporting elements.optgroup
element's end tag can be omitted
if the optgroup
element is
immediately followed by another optgroup
element, if it is immediately followed by an
hr
element, or if there is no more content in the parent
element.disabled
— Whether the form control is disabled
label
— User-visible label
HTMLOptGroupElement
.The optgroup
element represents a group of option
elements with a common label.
The element's group of option
elements consists of the option
elements that are children of the optgroup
element.
Support in all current engines.
The disabled
attribute is a boolean
attribute and can be used to disable a group
of option
elements together.
The label
attribute must be specified. Its value gives the name of the group, for the purposes of the user
interface.
There is no way to select an optgroup
element. Only
option
elements can be selected. An optgroup
element merely provides a
label for a group of option
elements.
The following snippet shows how a set of lessons from three courses could be offered in a
select
drop-down widget:
< form action = "courseselector.dll" method = "get" >
< p > Which course would you like to watch today?
< p >< label > Course:
< select name = "c" >
< optgroup label = "8.01 Physics I: Classical Mechanics" >
< option value = "8.01.1" > Lecture 01: Powers of Ten
< option value = "8.01.2" > Lecture 02: 1D Kinematics
< option value = "8.01.3" > Lecture 03: Vectors
< optgroup label = "8.02 Electricity and Magnetism" >
< option value = "8.02.1" > Lecture 01: What holds our world together?
< option value = "8.02.2" > Lecture 02: Electric Field
< option value = "8.02.3" > Lecture 03: Electric Flux
< optgroup label = "8.03 Physics III: Vibrations and Waves" >
< option value = "8.03.1" > Lecture 01: Periodic Phenomenon
< option value = "8.03.2" > Lecture 02: Beats
< option value = "8.03.3" > Lecture 03: Forced Oscillations with Damping
</ select >
</ label >
< p >< input type = submit value = "▶ Play" >
</ form >
option
elementSupport in all current engines.
select
element.datalist
element.optgroup
element.label
attribute and a value
attribute: Nothing.label
attribute but no value
attribute: Text.label
attribute and is not a
child of a datalist
element: Text that is not
inter-element whitespace.label
attribute and is a child
of a datalist
element: Text.option
element's end tag can be omitted if
the option
element is immediately followed by another option
element, if
it is immediately followed by an optgroup
element, if it is immediately followed by
an hr
element, or if there is no more content in the parent element.disabled
— Whether the form control is disabled
label
— User-visible label
selected
— Whether the option is selected by default
value
— Value to be used for form submission
HTMLOptionElement
.The option
element represents an option in a select
element or as part of a list of suggestions in a datalist
element.
In certain circumstances described in the definition of the select
element, an
option
element can be a select
element's placeholder label
option. A placeholder label option does not represent an actual option, but
instead represents a label for the select
control.
Support in all current engines.
The disabled
attribute is a boolean attribute. An option
element is disabled if its disabled
attribute is present or if it is a child of an
optgroup
element whose disabled
attribute is present.
The label
attribute provides a label for element. The label of an
option
element is the value of the label
content attribute, if there is one and its value is not the empty string, or, otherwise, the value
of the element's text
IDL attribute.
The label
content attribute, if specified, must not be
empty.
The value
attribute provides a value for element. The value of an
option
element is the value of the value
content attribute, if there is one, or, if there is not, the value of the element's text
IDL attribute.
The selected
attribute is a boolean attribute. It represents the default selectedness of the element.
A select
element whose multiple
attribute is not specified must not have more than one descendant option
element with
its selected
attribute set.
option.selected
Returns true if the element is selected, and false otherwise.
Can be set, to override the current state of the element.
option.index
Returns the index of the element in its select
element's options
list.
option.form
Returns the element's form
element, if any, or null otherwise.
option.text
Same as textContent
, except that spaces are collapsed and script
elements are skipped.
option = new Option([ text [, value [, defaultSelected [, selected ] ] ] ])
Returns a new option
element.
The text argument sets the contents of the element.
The value argument sets the value
attribute.
The defaultSelected argument sets the selected
attribute.
The selected argument sets whether or not the element is selected. If it is omitted, even if the defaultSelected argument is true, the element is not selected.
textarea
elementSupport in all current engines.
autocomplete
— Hint for form autofill feature
cols
— Maximum number of characters per line
dirname
— Name of form control to use for sending the element's directionality in form submission
disabled
— Whether the form control is disabled
form
— Associates the element with a form
element
maxlength
— Maximum length of value
minlength
— Minimum length of value
name
— Name of the element to use for form submission and in the form.elements
API
placeholder
— User-visible label to be placed within the form control
readonly
— Whether to allow the value to be edited by the user
required
— Whether the control is required for form submission
rows
— Number of lines to show
wrap
— How the value of the form control is to be wrapped for form submission
HTMLTextAreaElement
.The textarea
element represents a multiline plain text edit
control. The contents of the control represent the control's default value.
The readonly
attribute is a boolean
attribute used to control whether the text can be edited by the user or not.
In this example, a text control is marked read-only because it represents a read-only file:
Filename: < code > /etc/bash.bashrc</ code >
< textarea name = "buffer" readonly >
# System-wide .bashrc file for interactive bash(1) shells.
# To enable the settings / commands in this file for login shells as well,
# this file has to be sourced in /etc/profile.
# If not running interactively, don't do anything
[ -z "$PS1" ] && return
...</ textarea >
The cols
attribute specifies the expected maximum number of characters per line. If the cols
attribute is specified, its value must be a valid
non-negative integer greater than zero.
The rows
attribute specifies the number of lines to show. If the rows
attribute is specified, its value must be a valid
non-negative integer greater than zero.
The wrap
attribute is an enumerated attribute with the following keywords and states:
Keyword | State | Brief description |
---|---|---|
soft
| Soft | Text is not to be wrapped when submitted (though can still be wrapped in the rendering). |
hard
| Hard | Text is to have newlines added by the user agent so that the text is wrapped when it is submitted. |
The attribute's missing value default and invalid value default are both the Soft state.
If the element's wrap
attribute is in the Hard state, the cols
attribute must be specified.
The maxlength
attribute is a form control maxlength
attribute.
If the textarea
element has a maximum allowed value length, then the
element's children must be such that the length of the value of the element's
descendant text content with newlines
normalized is less than or equal to the element's maximum allowed value
length.
The minlength
attribute is a form control minlength
attribute.
The required
attribute is a boolean
attribute. When specified, the user will be required to enter a value before submitting the
form.
The placeholder
attribute represents a short
hint (a word or short phrase) intended to aid the user with data entry when the control has no
value. A hint could be a sample value or a brief description of the expected format.
The placeholder
attribute should not be used as
an alternative to a label
. For a longer hint or other advisory text, the title
attribute is more appropriate.
These mechanisms are very similar but subtly different: the hint given by the
control's label
is shown at all times; the short hint given in the placeholder
attribute is shown before the user enters a
value; and the hint in the title
attribute is shown when the user
requests further help.
The name
attribute represents the element's name.
The dirname
attribute controls how the element's directionality is submitted.
The disabled
attribute is used to make the control
non-interactive and to prevent its value from being submitted.
The form
attribute is used to explicitly associate the
textarea
element with its form owner.
The autocomplete
attribute controls how the user agent
provides autofill behavior.
textarea.type
Returns the string "textarea
".
textarea.value
Returns the current value of the element.
Can be set, to change the value.
Here is an example of a textarea
being used for unrestricted free-form text input
in a form:
< p > If you have any comments, please let us know: < textarea cols = 80 name = comments ></ textarea ></ p >
To specify a maximum length for the comments, one can use the maxlength
attribute:
< p > If you have any short comments, please let us know: < textarea cols = 80 name = comments maxlength = 200 ></ textarea ></ p >
To give a default value, text can be included inside the element:
< p > If you have any comments, please let us know: < textarea cols = 80 name = comments > You rock!</ textarea ></ p >
You can also give a minimum length. Here, a letter needs to be filled out by the user; a template (which is shorter than the minimum length) is provided, but is insufficient to submit the form:
< textarea required minlength = "500" > Dear Madam Speaker,
Regarding your letter dated ...
...
Yours Sincerely,
...</ textarea >
A placeholder can be given as well, to suggest the basic form to the user, without providing an explicit template:
< textarea placeholder = "Dear Francine,
They closed the parks this week, so we won't be able to
meet your there. Should we just have dinner?
Love,
Daddy" ></ textarea >
To have the browser submit the directionality of the element along with the
value, the dirname
attribute can be specified:
< p > If you have any comments, please let us know (you may use either English or Hebrew for your comments):
< textarea cols = 80 name = comments dirname = comments.dir ></ textarea ></ p >
output
elementSupport in all current engines.
for
— Specifies controls from which the output was calculated
form
— Associates the element with a form
element
name
— Name of the element to use in the form.elements
API.HTMLOutputElement
.The output
element represents the result of a calculation performed
by the application, or the result of a user action.
This element can be contrasted with the samp
element, which is the
appropriate element for quoting the output of other programs run previously.
Support in all current engines.
The for
content
attribute allows an explicit relationship to be made between the result of a calculation and the
elements that represent the values that went into the calculation or that otherwise influenced the
calculation. The for
attribute, if specified, must contain a
string consisting of an unordered set of unique space-separated tokens, none of which
are identical to another token and each of which must have the value of an ID of an element in the same tree.
The form
attribute is used to explicitly associate the
output
element with its form owner. The name
attribute represents the element's name. The output
element is associated with a form so that it can be easily referenced from the event
handlers of form controls; the element's value itself is not submitted when the form is
submitted.
output.value [ = value ]
Returns the element's current value.
Can be set, to change the value.
output.defaultValue [ = value ]
Returns the element's current default value.
Can be set, to change the default value.
output.type
Returns the string "output
".
A simple calculator could use output
for its display of calculated results:
< form onsubmit = "return false" oninput = "o.value = a.valueAsNumber + b.valueAsNumber" >
< input id = a type = number step = any > +
< input id = b type = number step = any > =
< output id = o for = "a b" ></ output >
</ form >
In this example, an output
element is used to report the results of a calculation performed by a remote
server, as they come in:
< output id = "result" ></ output >
< script >
var primeSource = new WebSocket( 'ws://primes.example.net/' );
primeSource. onmessage = function ( event) {
document. getElementById( 'result' ). value = event. data;
}
</ script >
progress
elementSupport in all current engines.
progress
element descendants.value
— Current value of the element
max
— Upper bound of range
HTMLProgressElement
.The progress
element represents the completion progress of a task.
The progress is either indeterminate, indicating that progress is being made but that it is not
clear how much more work remains to be done before the task is complete (e.g. because the task is
waiting for a remote host to respond), or the progress is a number in the range zero to a maximum,
giving the fraction of work that has so far been completed.
Support in all current engines.
There are two attributes that determine the current task completion represented by the element.
The value
attribute specifies how much of the task has been completed, and the max
attribute specifies how much work
the task requires in total. The units are arbitrary and not specified.
To make a determinate progress bar, add a value
attribute with the current progress (either a number from
0.0 to 1.0, or, if the max
attribute is specified, a number
from 0 to the value of the max
attribute). To make an
indeterminate progress bar, remove the value
attribute.
Authors are encouraged to also include the current value and the maximum value inline as text inside the element, so that the progress is made available to users of legacy user agents.
Here is a snippet of a web application that shows the progress of some automated task:
< section >
< h2 > Task Progress</ h2 >
< p > Progress: < progress id = p max = 100 >< span > 0</ span > %</ progress ></ p >
< script >
var progressBar = document. getElementById( 'p' );
function updateProgress( newValue) {
progressBar. value = newValue;
progressBar. getElementsByTagName( 'span' )[ 0 ]. textContent = newValue;
}
</ script >
</ section >
(The updateProgress()
method in this example would be called by some
other code on the page to update the actual progress bar as the task progressed.)
The value
and max
attributes, when present, must have values that are valid floating-point numbers. The value
attribute, if present, must have a value greater than or
equal to zero, and less than or equal to the value of the max
attribute, if present, or 1.0, otherwise. The max
attribute, if present, must have a value greater than
zero.
The progress
element is the wrong element to use for something that
is just a gauge, as opposed to task progress. For instance, indicating disk space usage using
progress
would be inappropriate. Instead, the meter
element is available
for such use cases.
progress.position
For a determinate progress bar (one with known current and maximum values), returns the result of dividing the current value by the maximum value.
For an indeterminate progress bar, returns −1.
meter
elementSupport in all current engines.
meter
element descendants.value
— Current value of the element
min
— Lower bound of range
max
— Upper bound of range
low
— High limit of low range
high
— Low limit of high range
optimum
— Optimum value in gauge
HTMLMeterElement
.The meter
element represents a scalar measurement within a known
range, or a fractional value; for example disk usage, the relevance of a query result, or the
fraction of a voting population to have selected a particular candidate.
This is also known as a gauge.
The meter
element should not be used to indicate progress (as in a progress bar).
For that role, HTML provides a separate progress
element.
The meter
element also does not represent a scalar value of arbitrary
range — for example, it would be wrong to use this to report a weight, or height, unless
there is a known maximum value.
There are six attributes that determine the semantics of the gauge represented by the element.
Support in all current engines.
Support in all current engines.
The min
attribute
specifies the lower bound of the range, and the max
attribute specifies the upper bound. The value
attribute specifies
the value to have the gauge indicate as the "measured" value.
The other three attributes can be used to segment the gauge's range into "low", "medium", and
"high" parts, and to indicate which part of the gauge is the "optimum" part. The low
attribute specifies the range that is
considered to be the "low" part, and the high
attribute specifies the range that is considered to be
the "high" part. The optimum
attribute gives the position that is "optimum";
if that is higher than the "high" value then this indicates that the higher the value, the better;
if it's lower than the "low" mark then it indicates that lower values are better, and naturally if
it is in between then it indicates that neither high nor low values are good.
The value
attribute must be specified. The value
, min
, low
, high
, max
, and optimum
attributes,
when present, must have values that are valid
floating-point numbers.
In addition, the attributes' values are further constrained:
Let value be the value
attribute's
number.
If the min
attribute is specified, then let minimum be that attribute's value; otherwise, let it be zero.
If the max
attribute is specified, then let maximum be that attribute's value; otherwise, let it be 1.0.
The following inequalities must hold, as applicable:
minimum ≤ value ≤ maximum
If no minimum or maximum is specified, then the range is assumed to be 0..1, and the value thus has to be within that range.
Authors are encouraged to include a textual representation of the gauge's state in the
element's contents, for users of user agents that do not support the meter
element.
When used with microdata, the meter
element's value
attribute provides the element's machine-readable value.
The following examples show three gauges that would all be three-quarters full:
Storage space usage: < meter value = 6 max = 8 > 6 blocks used (out of 8 total)</ meter >
Voter turnout: < meter value = 0.75 >< img alt = "75%" src = "graph75.png" ></ meter >
Tickets sold: < meter min = "0" max = "100" value = "75" ></ meter >
The following example is incorrect use of the element, because it doesn't give a range (and since the default maximum is 1, both of the gauges would end up looking maxed out):
< p > The grapefruit pie had a radius of < meter value = 12 > 12cm</ meter >
and a height of < meter value = 2 > 2cm</ meter > .</ p > <!-- BAD! -->
Instead, one would either not include the meter element, or use the meter element with a defined range to give the dimensions in context compared to other pies:
< p > The grapefruit pie had a radius of 12cm and a height of
2cm.</ p >
< dl >
< dt > Radius: < dd > < meter min = 0 max = 20 value = 12 > 12cm</ meter >
< dt > Height: < dd > < meter min = 0 max = 10 value = 2 > 2cm</ meter >
</ dl >
There is no explicit way to specify units in the meter
element, but the units may
be specified in the title
attribute in free-form text.
The example above could be extended to mention the units:
< dl >
< dt > Radius: < dd > < meter min = 0 max = 20 value = 12 title = "centimeters" > 12cm</ meter >
< dt > Height: < dd > < meter min = 0 max = 10 value = 2 title = "centimeters" > 2cm</ meter >
</ dl >
The following markup:
< h3 > Suggested groups</ h3 >
< menu >
< li >< a href = "?cmd=hsg" onclick = "hideSuggestedGroups()" > Hide suggested groups</ a ></ li >
</ menu >
< ul >
< li >
< p >< a href = "/group/comp.infosystems.www.authoring.stylesheets/view" > comp.infosystems.www.authoring.stylesheets</ a > -
< a href = "/group/comp.infosystems.www.authoring.stylesheets/subscribe" > join</ a ></ p >
< p > Group description: < strong > Layout/presentation on the WWW.</ strong ></ p >
< p > < meter value = "0.5" > Moderate activity,</ meter > Usenet, 618 subscribers</ p >
</ li >
< li >
< p >< a href = "/group/netscape.public.mozilla.xpinstall/view" > netscape.public.mozilla.xpinstall</ a > -
< a href = "/group/netscape.public.mozilla.xpinstall/subscribe" > join</ a ></ p >
< p > Group description: < strong > Mozilla XPInstall discussion.</ strong ></ p >
< p > < meter value = "0.25" > Low activity,</ meter > Usenet, 22 subscribers</ p >
</ li >
< li >
< p >< a href = "/group/mozilla.dev.general/view" > mozilla.dev.general</ a > -
< a href = "/group/mozilla.dev.general/subscribe" > join</ a ></ p >
< p > < meter value = "0.25" > Low activity,</ meter > Usenet, 66 subscribers</ p >
</ li >
</ ul >
Might be rendered as follows:
User agents combine the value of the title
attribute and the other attributes to provide context-sensitive
help or inline text detailing the actual values.
For example, the following snippet:
< meter min = 0 max = 60 value = 23.2 title = seconds ></ meter >
...might cause the user agent to display a gauge with a tooltip saying "Value: 23.2 out of 60." on one line and "seconds" on a second line.
The following example shows how a gauge could fall back to localized or pretty-printed text.
< p > Disk usage: < meter min = 0 value = 170261928 max = 233257824 > 170 261 928 bytes used
out of 233 257 824 bytes available</ meter ></ p >
fieldset
elementSupport in all current engines.
legend
element, followed by flow content.disabled
— Whether the descendant form controls, except any inside legend
, are disabled
form
— Associates the element with a form
element
name
— Name of the element to use in the form.elements
API.HTMLFieldSetElement
.The fieldset
element represents a set of form controls (or other
content) grouped together, optionally with a caption. The caption is given by the first
legend
element that is a child of the fieldset
element, if any. The
remainder of the descendants form the group.
Element/fieldset#attr-disabled
Support in all current engines.
The disabled
attribute, when specified, causes all the
form control descendants of the fieldset
element, excluding those that are
descendants of the fieldset
element's first legend
element child, if
any, to be disabled.
A fieldset
element is a disabled
fieldset if it matches any of the following conditions:
disabled
attribute is specified
fieldset
element whose disabled
attribute is specified, and is not a
descendant of that fieldset
element's first legend
element child, if
any.The form
attribute is used to explicitly associate the
fieldset
element with its form owner. The name
attribute represents the element's name.
fieldset.type
Returns the string "fieldset".
fieldset.elements
Returns an HTMLCollection
of the form controls in the element.
This example shows a fieldset
element being used to group a set of related
controls:
< fieldset >
< legend > Display</ legend >
< p >< label >< input type = radio name = c value = 0 checked > Black on White</ label >
< p >< label >< input type = radio name = c value = 1 > White on Black</ label >
< p >< label >< input type = checkbox name = g > Use grayscale</ label >
< p >< label > Enhance contrast < input type = range name = e list = contrast min = 0 max = 100 value = 0 step = 1 ></ label >
< datalist id = contrast >
< option label = Normal value = 0 >
< option label = Maximum value = 100 >
</ datalist >
</ fieldset >
The following snippet shows a fieldset with a checkbox in the legend that controls whether or not the fieldset is enabled. The contents of the fieldset consist of two required text controls and an optional year/month control.
< fieldset name = "clubfields" disabled >
< legend > < label >
< input type = checkbox name = club onchange = "form.clubfields.disabled = !checked" >
Use Club Card
</ label > </ legend >
< p >< label > Name on card: < input name = clubname required ></ label ></ p >
< p >< label > Card number: < input name = clubnum required pattern = "[-0-9]+" ></ label ></ p >
< p >< label > Expiry date: < input name = clubexp type = month ></ label ></ p >
</ fieldset >
You can also nest fieldset
elements. Here is an example expanding on the previous
one that does so:
< fieldset name = "clubfields" disabled >
< legend > < label >
< input type = checkbox name = club onchange = "form.clubfields.disabled = !checked" >
Use Club Card
</ label > </ legend >
< p >< label > Name on card: < input name = clubname required ></ label ></ p >
< fieldset name = "numfields" >
< legend > < label >
< input type = radio checked name = clubtype onchange = "form.numfields.disabled = !checked" >
My card has numbers on it
</ label > </ legend >
< p >< label > Card number: < input name = clubnum required pattern = "[-0-9]+" ></ label ></ p >
</ fieldset >
< fieldset name = "letfields" disabled >
< legend > < label >
< input type = radio name = clubtype onchange = "form.letfields.disabled = !checked" >
My card has letters on it
</ label > </ legend >
< p >< label > Card code: < input name = clublet required pattern = "[A-Za-z]+" ></ label ></ p >
</ fieldset >
</ fieldset >
In this example, if the outer "Use Club Card" checkbox is not checked, everything inside the
outer fieldset
, including the two radio buttons in the legends of the two nested
fieldset
s, will be disabled. However, if the checkbox is checked, then the radio
buttons will both be enabled and will let you select which of the two inner
fieldset
s is to be enabled.
This example shows a grouping of controls where the legend
element both labels
the grouping, and the nested heading element surfaces the grouping in the document outline:
< fieldset >
< legend > < h2 >
How can we best reach you?
</ h2 > </ legend >
< p > < label >
< input type = radio checked name = contact_pref >
Phone
</ label > </ p >
< p > < label >
< input type = radio name = contact_pref >
Text
</ label > </ p >
< p > < label >
< input type = radio name = contact_pref >
Email
</ label > </ p >
</ fieldset >
legend
elementSupport in all current engines.
fieldset
element.HTMLLegendElement
.The legend
element represents a caption for the rest of the contents
of the legend
element's parent fieldset
element.
legend.form
Returns the element's form
element, if any, or null otherwise.