---
id: 2938
title: "How to Implement Dark Mode with CSS and JavaScript"
source_domain: hackerone.com
source_url: "https://www.hackerone.com/blog/how-implement-dark-mode-css-and-javascript"
published_at: "2020-10-22T01:00:00Z"
tags: ["tutorial", "javascript", "dark-mode", "frontend", "css", "css-variables"]
phying_url: "https://phying.com/item/2938"
lang: en
---

# How to Implement Dark Mode with CSS and JavaScript

## Summary

A step-by-step guide to dark mode using only CSS variables and a data-theme attribute, with a small JavaScript toggle handling the light and dark class swap.

## Intelligence Metadata

- **Sources:** hackerone.com
- **Published:** 2020-10-22T01:00:00Z
- **Original:** https://www.hackerone.com/blog/how-implement-dark-mode-css-and-javascript
- **Phying News:** https://phying.com/item/2938