1. What happened
WebGL project build with Unity 5.1.0f2 with HTML content which require keyboard input is no longer working. In earlier version 5.0.1 setting parameter 'doNotCaptureKeyboard : true' to Module definition enabled keyboard input to be enabled on HTML controls running on the same page.

2. How we can reproduce it using the example you attached

Case 1:
- build included KeyboardFocus project with Unity 5.0.1 (an empty scene)
- add '<input type="text" value="" />' field to the HTML page
- add 'doNotCaptureKeyboard : true' parameter to the Module definition
- run the build in browser
- try input text to input field
=> text displayed correctly

Case 2:
- build included KeyboardFocus project with Unity 5.1.0 (an empty scene)
- add '<input type="text" value="" />' field to the HTML page
- add 'doNotCaptureKeyboard : true' parameter to the Module definition
- run the build in browser
- try input text to input field
=> BUG: cannot input text to the input field!