Alternatively, is it possible to validate against another field\'s value with html5?
A common example would be selecting a date range where \"from\" date sh
I'm worry, that there's no chance how to validate a input value based on other input value. Only good old javascript.
But maybe you can use and set some minimal step (1 day / 1 hour / …). Then you can use min and max value by same-named attributes.
min
max