Ограничение валидности (API-Forms, HTML+JS)
Ограничение валидности (API-Forms, HTML+JS)
Объект ValidityState
target,
valid,
valueMissing,
typeMismatch,
patternMismatch,
tooLong,
rangeUnderflow,
rangeOverflow,
stepMismatch,
customError,
setCustomValidity()