Hi all!
I hope you all are fine and healthy.
Here there is a my work on Mozilla Splash Page for your assessment.
Assessment link is:
and my Glitch links are:
https://mozilla-splashpage.glitch.me
Thank you for your assessment.
Have a nice day 
Arshad
Hi @sarshas356
Congratulations, everything works correctly. 
I just have one small improvement. You could remove the second <source> in <picture>. When the width is bigger than 600px it would then automatically use the fallback <img>.
Have a nice weekend,
Michael
That’s correct. There is no need to mention the second source. If the first condition is not true, then it will jump to the fallback “img” element.
Thanks for pointing out and the assessment.
Have a nice day.
Arshad