A11y-NVDA When moving focus across tabs always calls out tab as selected

[JanMiksovsky]

From @giltza on July 25, 2016 13:28

Description

NVDA accesability tool announces each paper-tab that is given a focus that it is the selected tab.

paper-tab is an aria role 'tab' implementation and should adhere to this aria role spec at https://www.w3.org/TR/wai-aria-1.1/#tab

Quote from aria spec.

In either case, authors should ensure that a selected tab has its aria-selected attribute set to true, that inactive tab elements have their aria-selected attribute set to false, and that the currently selected tab provides a visual indication that it is selected. In the absence of an aria-selected attribute on the current tab, user agents should indicate to assistive technologies through the platform accessibility API that the currently focused tab is selected.

iron-menu-behavior removes the aria-selected attribute rather then setting it to false.

Expected outcome

NVDA announces each paper-tab we traverse as selected.

Actual outcome

Only the selected tab should be announced as selected.

Live Demo

Steps to reproduce

1. Enable NVDA accessibility tool,
2. Go to paper-tabs demo
3. Using the Keyboard move the focus from one tab to another (While not changing the selected state)

Browsers Affected

• [x] Chrome
• [x] Firefox
• [ ] Safari 9
• [ ] Safari 8
• [ ] Safari 7
• [ ] Edge
• [ ] IE 11
• [ ] IE 10

Copied from original issue: PolymerElements/paper-tabs#176