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 Standard The definition of 'ValidityState.rangeUnderflow' in that specification. |
Living Standard | |
HTML 5.1 The definition of 'ValidityState.rangeUnderflow' in that specification. |
Recommendation | |
HTML5 The definition of 'ValidityState.rangeUnderflow' in that specification. |
Recommendation |
Browser compatibility
No compatibility data found. Please contribute data for "api.ValidityState.rangeUnderflow" (depth: 1) to the MDN compatibility data repository.