Survey Form Challenge HTML Validation Question

One of the requirements in this challenge is to:

User Story #8: If I enter non-numbers in the number input, I will see an HTML5 validation error.

If you use an input type of number it is no possible to enter anything but numbers.

Is this out of date?

no, not at all.
it can’t be old fashioned if you use it efficiently.
don’t care about it.