Steps to reproduce the problem:
1. https://mail2.pfinders.com/vindicia/
2. Accept certificate if necessary.
3. Press finger on credit card field see it turn blue with onfocus event.
4. Enter a number that is not a valid credit card.
5. If you press the Done button on the soft keyboard the field turns red because the Done button triggered the onblur event which triggered validation.
6. Press finger back down on the credit card field and enter a valid credit card number ex: '4111111111111111' and tap the side of the page to be off the input box. No onblur event triggered so the field did not turn green.
7. Click the 'Done' button and notice the onblur event did not trigger the field to turn green.
8. Press back inside the credit card field and click the Done button on the soft keyboard. Watch the onblur event turn the field green.

What is the expected behavior?
I expect the onblur event to be triggered with leaving the input box by any means especially with tapping away from it.

What went wrong?
The only way the onblur event is triggered is by clicking the Done button on the soft keyboard.

Did this work before? N/A 

Chrome version: 57.0.2987.137  Channel: stable
OS Version: 10.2
Flash Version: 

This page has single input boxes of forms inside iframes. This  separation of forms across multiple iframes is required for Credit Card PCI compliance as mandated by Visa and Mastercard.
It works fine on other platforms. This seems to be iOS specific.