Fading Animation

I dont understand why in the lesson about animation movement, it starts at 0% using pixels but the lesson after which teaches about fading animation starts off at 50% and uses % instead of pixels. I was just messing around with the code and change it to pixels but when using the offset of left, the animation moved right. Only difference I noticed in was that the element was positioned absolute instead of relative

#ball { width: 70px; height: 70px; margin: 50px auto; position: fixed; left: 20%; border-radius: 50%; background: linear-gradient( 35deg, #ccffff, #ffcccc ); animation-name: fade; animation-duration: 3s; } @keyframes fade { 50% { left: 60%; } }

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.81 Safari/537.36 Edg/94.0.992.50

Challenge: Create Visual Direction by Fading an Element from Left to Right

Link to the challenge:

  • as required on instructions you should add opacity: 0.1; like the code below

@keyframes fade {
50% {
left: 60%;
opacity: 0.1;
}}

Hi, yes I understand that and I can pass the exercise no problem but I like to go deeper and understand the whole code. Why are we using percentage in this lesson when the previous lesson used pixels for the offsets. & Why does it start at 50% instead of 0%

@Hellthinky,
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