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Copy-ready answers to everyday coding questions, each with a short explanation. Laravel, PHP, JavaScript, SQL, Bash and more.

1 snippet tagged #css · Show all

JavaScript October 14, 2026 JavaScript dark mode toggle that remembers the user’s choice Uses the system preference on the first visit, then saves the user’s choice in localStorage. It sets a data-theme attribute you can style in CSS. const root = document.documentElement; const saved = localStorage.getItem('theme'); const prefersDark = window.matchMedia('(prefers-color-scheme: dark)').matches;

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