UserAgent: Mozilla/5.0 (X11; CrOS x86_64 9000.91.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.110 Safari/537.36

Steps to reproduce the problem:
Steps to reproduce:
1. Open the  Apply for a Job page:  https://grow-demo.googleplex.com/jobs/c2193f1c-b702-4b5a-b17c-3efc44393905
2. Navigate to Qualifications > Select any of Required skills, for example: HTML5 
https://screenshot.googleplex.com/FbQNvjH5XuY
3. The HTML5 'grow-skill-dialog'  dialog will open:  https://screenshot.googleplex.com/dXdtJfeaXaH
4. Use ARROW key navigation > Select the '?' help button>  Listen to ChromeVox it should read Help content
5. Navigate to Related actions and select '?' help button > Listen to ChromeVox it should read Help content
https://screenshot.googleplex.com/YyNGgotV93g

3. Wave: An aria-label, aria-labelledby, or aria-describedby attribute is present.
An ARIA role, state, or property is present.  =>  tooltip_1.png  tooltip_2.png

What is the expected behavior?
Expected Result:
1.ToolTip Content should be read by VoiceReaders when  selected  by Arrow keys
2. Focus stays on the triggering element while the tooltip is displayed.
https://www.w3.org/TR/wai-aria-practices/#tooltip

What went wrong?
Tooltip button is activated opening window with help notes which should ve read by screen reader automatically - but ChromeVox doesn't read tooltip content, however VoiceOver and Windows screen readers do read automatically tooltip content

Did this work before? N/A 

Chrome version: 56.0.2924.110  Channel: n/a
OS Version: 9000.91.0
Flash Version: