Label not shown in empty paper-textarea on IE11

[icewhite]

Description

The label for a paper-texarea is not shown in IE 11

Expected outcome

Specified label should be shown in a paper-textarea - It is shown properly in Chrome & Firefox but not in IE11.
Here is how it looks in Chrome:

Actual outcome

And here it is in IE11 (with the problem textarea lassoed in red):

Live Demo

The issue can be observed on the paper-input demo page using IE11.
https://www.webcomponents.org/element/PolymerElements/paper-input/demo/demo/index.html

Steps to reproduce

1. Go to https://www.webcomponents.org/element/PolymerElements/paper-input/demo/demo/index.html in IE11.
2. Look at the first example of a paper-textarea. See Chrome for how it is supposed to look.

Browsers Affected

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