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.
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:![Screenshot from 2019-03-17 05-30-45](https://user-images.githubusercontent.com/24550770/54483302-f11c1100-4876-11e9-9ced-51e06e1357c8.png)