I am a convert to format vendor prefixed values for easy scanning to ensure all of the values are the same - which points out that the non-prefixed version has `-180deg` instead of `-90deg`. Is this intentional?

```
  background-image: -webkit-linear-gradient(-90deg, #fefefe 0%, #f1f1f1 100%);
  background-image:    -moz-linear-gradient(-90deg, #fefefe 0%, #f1f1f1 100%);
  background-image:     -ms-linear-gradient(-90deg, #fefefe 0%, #f1f1f1 100%);
  background-image:      -o-linear-gradient(-90deg, #fefefe 0%, #f1f1f1 100%);
  background-image:         linear-gradient(-180deg, #fefefe 0%, #f1f1f1 100%);
````