{# `data-base` is what makes a custom theme inherit: tokens.css matches `[data-base="shire"]` as well as `[data-theme="shire"]`, so a custom light theme gets the whole parchment palette underneath its own handful of colours. Without it, four light colours would sit on Moria's near-black surfaces. `data-themes` is the list of `id:base` pairs, which is what the browser needs in order to set both attributes when somebody switches -- one attribute to split rather than a JSON island to parse. #}
{# `viewport-fit=cover` is what lets `env(safe-area-inset-*)` resolve to anything but zero, and without it the `black-translucent` status bar style below is a promise with nothing behind it: iOS puts the page under the clock and the notch and the tokens that would have paid for it stay at 0. No `maximum-scale` and no `user-scalable=no` -- pinch-zoom is somebody's accessibility setting, not a layout problem to be suppressed. #}