WCAG 2.0 accessibility issue. "Label text is empty"

[scrawlon]

The date-input-polyfill adds two select inputs 'yearSelect' and 'monthSelect' without labels. This triggers an "Label text is empty" error in a WCAG 2.0 accessibility tester.

I was able to fix this by adding - aria-hidden='true' - to the date-input-polyfill element. This hides the date picker from screen readers.