stepMismatch 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
If the field is numeric in nature, including the date, month, week, time, datetime-local, number and range types and the step value is not
any, if the value don't doesn't conform to the constraints set by the
min values, then
stepMismatch will be true. If the remainder of the form control's value less the
min value, divided by the
step value (which defaults to 1 if omitted) is not zero, there is a mismatch.
Given the following:
<input type="number" min="20" max="40" step="2" />
(value - min) % 2 !== 0,
stepMismatch will be true.
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