UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.106 Safari/537.36

Steps to reproduce the problem:
1. Open https://jsfiddle.net/oliverschwarzpdm/8s5h4ppb/2/
2. See the diffenrence between the two animated lines.
3. 

What is the expected behavior?
The left starting point for each line should be the same. There shouldn't be a difference between the value "0% 0%" and "0 0" as 0% is mathematically 0.

What went wrong?
There is a difference in handling the value "0 0" and "0% 0%" in transform-origin.

Did this work before? N/A 

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

As per official documentation (https://www.w3.org/TR/css-transforms-1/#propdef-transform-origin) the value "0% 0%" implies the position to top left. The default value "0 0" also implies to top left position.