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Relies on https://developer.mozilla.org/en-US/docs/Web/CSS/color_value/light-dark and
:root[data-theme="dark"]/:root[data-theme="light"]to handle theme switches without needing to add a "dark" class throughout the code.The
jsfor this is directly in the<head>so it should trigger as early as possible during bootstrap.I tried to make this work with zero js, but from what I understand there's no way to "save" your selected theme without it triggering a flash. It is possible if we only rely on system theme... but at least in my use, I often pick light/dark on a site by site basis.
The non-js version will always be light theme.