Quiz and Challenge Task question

When I was taking the quiz right before the challenge task there was a fill in the blank question that asked what is the second value in the transition shorthand property. I put delay and I was correct. Then in the challenge task I had to write a transition shorthand property and the first time I did it I had the delay in the section spot and it told me I was wrong when I switched the delay and duration it said I was correct.

Here is a copy of the challenge question:

Using the prefix for WebKit-based browsers, create a transition for the border-radius property of .box. Give the transition a duration of 2 seconds, a delay of 1 second, and a timing function that maintains a linear motion.

Is there a discrepancy between the two or am I overlooking something?

This is what I put and it was wrong -webkit-transition:border-radius 1s linear 2s;

This is what I put and it was right -webkit-transition:border-radius 2s linear 1s;

Also, I have one more question since this video is almost a year old do we still need to use the vendor prefixes?