Defect description: Check Answer button in the first part of the experiment doesn't give output because of Javascript referencing Null element.
Steps to reproduce the issue: 1.Go here
2.Fill in the values for the first part and click on "Check Answer!"
Expected Result: Button click should output whether answer is correct or not.
Actual Result: Button click gives no output because the Javascript sends the output text to a null element ID as shown in the console section of the screenshot.

Screenshot: