I don't work for Ikea so I don't know how it is implemented. What you can see in the Network tab is that you get chunks of html from the backend which have all

I don't work for Ikea so I don't know how it is implemented. What you can see in the Network tab is that you get chunks of html from the backend which have all the markup Other e-commerce stores do that too. Sometimes these chunks also have js in them.