Paper-dropdown-menu doesn't support auto-validate

[krozycki]

Description

Paper-dropdown-menu should support auto-validate as does for example paper-input.

[tbockrath]

This would be a nice feature. Have you found a solution for this?

[krozycki]

Unfortunately, I haven't had time to look into this yet.

[tbockrath]

You could set the auto-validate property and a pattern for the field in paper-dropdown-menu.html.

[sweatybridge]

#207 might be relevant