Example URL:

Steps to reproduce the problem:
1. Install test app: https://github.com/FaultException/WebViewElementNoStyleBug
2. An alert dialog should appear with a message containing the value of document.createElement('div').style.

What is the expected behavior?
document.createElement('div').style should contain a CSSStyleDecleration.

The dialog should say something along the lines of [object CSSStyleDeclaration]

What went wrong?
document.createElement('div').style is undefined.

The dialog says undefined.

Does it occur on multiple sites: N/A

Is it a problem with a plugin? N/A 

Did this work before? N/A 

Does this work in other browsers? N/A 

Chrome version: 49.0.2623.105  Channel: stable
OS Version: 6.0.1
Flash Version: 

This happens when loading an XHTML document through Android WebView's shouldInterceptRequest and returning a WebResourceResponse with a null or blank mime type.

If you specify "text/html" it works fine, even though the document is XHTML.

You shouldn't return a null mime type, but there is no error if you do, and it causes this unexpected and hard to track down behavior.