HTML and CSS Reference
In-Depth Information
required
(
required="required"
in XHTML)
Not in HTML 4.01
. When present, indicates the input value is required. Applies to
text
,
password
,
checkbox
,
radio
,
file
,
email
,
tel
,
search
,
url
,
number
,
date
,
time
,
date-
time
,
datetime-local
,
month
, and
week
.
size="
number
number
"
Specifies the width of a text-entry control, measured in number of characters. Users may
type entries that are longer than the space provided, causing the field to scroll to the right.
Applies to
text
,
password
,
email
,
tel
,
search
, and
url
,
src="
URL
URL
"
When the input type is
image
, this attribute provides the location of the image to be used
as a push button.
step="any
|number
|number
"
Not in HTML 4.01
. Indicates the granularity that is expected and required of the value
by limiting the allowed value to permitted units. The value of this attribute is dependent
on the
type
of the input control. It may be a number greater than zero or the keyword
any
, which allows any unit value. Applies to
number
,
range
,
date
,
time
,
datetime
,
datetime-local
,
month
, and
week
.
type="button|checkbox|color|date|time|datetime|datetime-local|email|-
file|hidden|image|month|number|password|radio|range|reset|search|sub-
mit|tel|text|url|week"
Specifies the data type and associated form control. Descriptions of each input type and
their associated attributes are listed below.
value="
text
text
"
Specifies the initial value for this control. Applies to all input types except
image
.
