HTML attribute: required
required attribute, if present, indicates that the user must specify a value for the input before the owning form can be submitted.
required attribute is supported by
<input> types along with the
<textarea> form control elements. If present on any of these input types and elements, the
:required pseudo class will match. If the attribute is not included, the
:optional pseudo class will match.
The attribute is not supported or relevant to range and color, as both have default values. It is also not supported on hidden as it can not be expected that a user to fill out a form that is hidden. Nor is it supported on any of the button types, including
range don't support
required, but type
color defaults to
range defaults to the midpoint between
max -- with
max defaulting to 0 and 100 respectively in most browsers if not declared -- so always has a value.
In the case of a same named group of radio buttons, if a single radio button in the group has the
required attribute, a radio button in that group must be checked, although it doesn't have to be the one with the attribute is applied. So to improve code maintenance, it is recommended to either include the
required attribute in every same-named radio button in the group, or else in none.
In the case of a same named group of checkbox input types, only the checkboxes with the
required attribute are required.
aria-required="true" tells a screen reader that an element (any element) is required, but has no bearing on the optionality of the element.
Because a read-only field cannot have a value,
required does not have any effect on inputs with the
readonly attribute also specified.
When including the
required attribute, provide a visible indication near the control informing the user that the
<textarea> is required. In addition, target required form controls with the
:required pseudo-class, styling them in a way to indicate they are required. This improves usability for sighted users. Assistive technology should inform the user that the form control in mandatory based on the required attribute, but adding
aria-required="true" doesn't hurt, in case the browser / screen reader combination does not support
Provide an indication to users informing them the form control is required. Ensure the messaging is multi-faceted, such as through text, color, markings, and attribute, so that all users understand the requirements whether they have color blindness, cognitive differences, or are using a screen reader.
<form> <div class="group"> <input type="text"> <label>Normal</label> </div> <div class="group"> <input type="text" required="required"> <label>Required</label> </div> <input type="submit"> </form>
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