Nerdish stuff; sorry. In Safari it isn't as straightforward as it is in, say, Chrome. You first have to go to Preferences > Advanced, and then select "Show Develop menu in menu bar" (at least something like that; I don't use Safari).
After closing the Preferences window, there should be a new menu option for "Develop." Under that should be an option to "Show Page Source." What you'll see isn't the actual code. Most websites nowadays, like WikiTree, run application front-ends that call various databases where the actual content is stored. So there is no "page," per se...like there was a decade ago. Each time you visit a profile, the page that you see is dynamically rendered, on-the-fly, by the combination of source-code engine, linked style sheets, and the content in the databases.
In some other web browsers viewing that rendered code is as simple as a right-click anywhere on a webpage, and then choosing "View page source." In Chrome, more often than not I use an even nerdier option, the deceptively simple-sounding "Inspect." That splits the display window and opens up a pretty comprehensive set of tools to see details of what's going on under the hood. Speaking of, most of us probably don't realize it, but even when we're logged in, every profile page we visit at WikiTree is setting third-party cookies with the advertising company DoubleClick.net. Completely innocuous, but every profile visit is setting a couple of cookies.
I, er... Uh, I still need a ladder to get out of this rabbit hole... I'll stop talking nerdish if I climb out of this hole...
