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hextra_mirror/assets/js/head/theme.js

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// The section must not be in the theme.js (body) file because it can create a quick flash (switch between light and dark).
function setTheme(theme) {
document.documentElement.classList.remove("light", "dark");
if (theme !== "light" && theme !== "dark") {
theme = window.matchMedia("(prefers-color-scheme: dark)").matches ? "dark" : "light";
}
document.documentElement.classList.add(theme);
document.documentElement.style.colorScheme = theme;
}
setTheme("color-theme" in localStorage ? localStorage.getItem("color-theme") : '{{ site.Params.theme.default | default `system`}}')