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JavaScript

const themeSwitcher=document.querySelector(".theme-switcher");let currentTheme=localStorage.getItem("theme"),userHasManuallyChangedTheme=null!==currentTheme;function setTheme(e){document.documentElement.setAttribute("data-theme",e),localStorage.setItem("theme",e),currentTheme=e}function switchTheme(){let e="dark"===currentTheme?"light":"dark";setTheme(e),userHasManuallyChangedTheme=!0}themeSwitcher.addEventListener("click",switchTheme,!1),window.matchMedia("(prefers-color-scheme: dark)").addEventListener("change",e=>{userHasManuallyChangedTheme||setTheme(e.matches?"dark":"light")});