UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.81 Safari/537.36

Steps to reproduce the problem:
1. inspect any element and add/edit the css attribute 'object-fit'

What is the expected behavior?
to see all the possible values for this rule

/* Keyword values */
object-fit: fill;
object-fit: contain;
object-fit: cover;
object-fit: none;
object-fit: scale-down;

/* Global values */
object-fit: inherit;
object-fit: initial;
object-fit: unset;

according to https://developer.mozilla.org/en-US/docs/Web/CSS/object-fit?v=example

What went wrong?
only 'inherit' and 'initial' are shown, which gives the impression the these are the only supported values for this attribute 

Did this work before? N/A 

Chrome version: 58.0.3029.81  Channel: stable
OS Version: OS X 10.12.4
Flash Version: