Platform refusing to accept the correct answer

[kazoo135]

Challenge Escape Sequences in Strings has an issue.
User Agent is: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36.
Please describe how to reproduce this issue, and include links to screenshots if possible.

My code:

var myStr = "FirstLine\n\\SeondLine\\\rThirdLine";
When running this in my web dev console i receive 
"FirstLine
\SecondLine\ThirdLine"

However when I run this code with \n rather than \r

var myStr = "FirstLine\n\\SeondLine\\\nThirdLine";
"FirstLine
\SecondLine\
ThirdLine"

which I believe is what we're after - That being said neither runs in the platform

[raisedadead]

SeondLine check that its not a typo that is causing it to fail?

[raisedadead]

Please clarify more as requested.

[cyphx]

The platform is refusing to accept my answer too. I tried
var myStr='FirstLine\n\SecondLine\\nThirdLine';

and the output being shown is
myStr="FirstLine\n\SecondLine\\nThirdLine"

instead of the expected output. I asked for help in the chat room and people told me that my code gives the expected result when they run it.