Chrome Version       : 56.0.2924.76
URLs (if applicable) : http://jsfiddle.net/o2gxgz9r/2169/
Other browsers tested:
  Add OK or FAIL, along with the version, after other browsers where you
have tested this issue:
     Safari: Passed
    Firefox: Passed
         IE: Passed

What steps will reproduce the problem?
(1) Look at the js fiddle link above
(2) String.fromCharCode(31) will be shown as a triangle
(3)

What is the expected result?
Should not show anything when it is a non-printable character.

What happens instead?
Showing a triangle.

Please provide any additional information below. Attach a screenshot if
possible.