That doesn’t mean you shouldn’t use those vendor specific prefixes.
Different browsers may treat invalid code differently and sometimes in unexpected ways.
Since I only need to have minimum lengths stored to proceed, an easy and handy way is to assign this value to another valid attribute of the input tag.
One of the discussions that arises from time to time in web development circles is that of validating your code. It’s no different than comparing a sentence you write to the rules of grammar for the language you wrote it in.
Since validation is comparing your code to W3C standards I think the best way to validate your code is using the W3C validation tools.
If you click the links above it’ll look like they go to the same page, but I assure you they’re different.