Look, most of the surface area it’s talking about is quite new, often still nominally experimental, and quite a bit not supported across all browsers (most commonly Chromium-only, with some Chromium-and-Safari-since-March-but-not-Firefox-yet; and note that none of them have an implementation but lack a Chromium implementation, even though there are a few possible features that meet these criteria—this is one of a few things that show the heavy Chromium bias in the survey).