tabindex for paper-toggle-button not working in IE 11

[unionthugface]

Description

If you set the tabindex$ attribute explicitly on the paper-toggle-button itself, you can tab to this element in every browser except IE 11. The tab sequences skips right over it and goes to the next item. So long as the tabindex$ is unset, works as expected in IE as well.

Expected outcome

Tab to paper-toggle-button.

Actual outcome

IE skips right over the paper-toggle-button to the next element.

Steps to reproduce

1. put two elements next to a paper-toggle-button
2. set tabindex$ on each
3. try to tab to paper-toggle-button

Browsers Affected

• Chrome
• Firefox
• Safari 9
• Safari 8
• Safari 7
• Edge
• IE 11
• IE 10