What is that link showing? Is he using Shopify as a random website to test his browser against or something? If that's it, that's so hilarious wholesome to end up getting sponsored by them I love it.

A list of videos when Andreas Kling uses the landing page of Shopify at the sample to implement new features or fix the broken ones, mostly SVG/layout related.

Like it was stated in one of the video, Shopify uses a lot of modern cutting-edge web technologies, so display the site correctly is quite the challenge. You should watch some of his videos if you have free time, it is a pleasant surprise of what Ladybird can do after just some dozen months of development.