Subject of the issue

The plugin does not validate elements that are outside of the <form> but have the form attribute on them.

Your environment

• version of jquery-validate: 1.17.0
• which browser and its version: Chrome 65, macOS

Steps to reproduce

See https://jsfiddle.net/robertmiles3/hpundyj5/4/

Expected behaviour

On submit, validation should fail for both inputs.

Actual behaviour

On submit, validation only fails for the input inside the <form>.