UserAgent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.106 Safari/537.36

Example URL:
http://jsfiddle.net/z507yah4/

Steps to reproduce the problem:
1. Open jsfiddle example
2. focus on input element
3. type a char 

What is the expected behavior?

What went wrong?
label and input unexpected have moved

Does it occur on multiple sites: N/A

Is it a problem with a plugin? No 

Did this work before? No 

Does this work in other browsers? Yes 

Chrome version: 51.0.2704.106  Channel: stable
OS Version: 10.0
Flash Version: Shockwave Flash 22.0 r0

If I type in the input , the label next to it will move which is unexpected.
Then, if I delete the typed text by pressing "backspace", the label returns to its original position.