There was something about the appearance of iOS 26 Safari WebViews I wasn’t too sure about, and now I know: there’s a material transition between the header and the web-page, but there’s nothing separating the two. No edge, no gradient. This looks unnatural and, dare I say, a little amateur.
It may not be so egregious if there’s a mark difference in colour between the two, but with something like this that’s effectively transparent, it just looks broken.