Basically, it’s a glitch that happens when a website is rendered in a user agent (a web browser) where, for a bief moment, the user (that’s, like, you) sees an unstyled version of the page before it fully loads. This happens a lot in Safari if the page in question has Google Ads — like the main page of my site. So if you see it while browsing my site: it’s not you, it’s not me, it’s Safari.
Of course, I could always remove the ads but after 4 years I’ve “earned” just over $50.00! That’s American dollars! Yeah, you see thing thing is, Google only sends you a cheque for every $100.00 so I haven’t actually seen that money yet. Bah!