The read-only rangeUnderflow
property of a ValidityState
object indicates if the value of an <input>
, after having been edited by the user, does not conform to the constraints set by the element's min
attribute.
If the field is numeric in nature, including the date, month, week, time, datetime-local, number and range types and a min
value is set, if the value don't doesn't conform to the constraints set by the min
value, the rangeUnderflow
property will be true.
Given the following:
<input type="number" min="20" max="40" step="2"/>
if value < 20
, rangeUnderflow
will be true. When true
, the element matches the :invalid
and :out-of-range
CSS pseudo-classes.
Specifications
Specification | Status | Comment |
HTML Living StandardThe definition of 'ValidityState.rangeUnderflow' in that specification. | Living Standard | |
HTML 5.1The definition of 'ValidityState.rangeUnderflow' in that specification. | Recommendation | |
HTML5The definition of 'ValidityState.rangeUnderflow' in that specification. | Recommendation |
Browser compatibility
The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
No compatibility data found. Please contribute data for "api.ValidityState.rangeUnderflow" (depth: 1) to the MDN compatibility data repository.
See also
ValidityState.rangeOverflow
- Constraint validation
- Forms: Data form validation
step
attributemax
attribute
ValidityState.rangeUnderflow by Mozilla Contributors is licensed under CC-BY-SA 2.5.