If you move from one page of a site without a scrollbar to another with a scrollbar, you’ll see a slight layout shift as things squeeze inward a bit to make room for the scrollbar.
A classic fix was html { overflow-y: scroll; } to force the scrollbar all the time. Ayke van Laëthem has found a more elegant solution in html { margin-left: calc(100vw - 100%); } which works because vw accounts for the scrollbar and % doesn’t, and… just read it as there are a few more things you’ll need to be aware of anyway.
Pretty sweet for a first blog post Ayke!