How to Implement Dynamic Light and Dark Themes in PWAs

While Progressive Web Apps (PWAs) support static configurations like theme color, they do not offer a built-in solution for dynamic light and dark theme switching based on user preferences. This limitation arises because PWAs rely on static JSON manifest files, which can only define a single theme color. To overcome this, developers can combine CSS and JavaScript to dynamically change the theme color based on user input. A workaround exists by using the `prefers-color-scheme` CSS media query, which adjusts the theme color in response to the user’s system settings. Although the manifest file cannot dynamically change, web pages can still load the appropriate theme color based on these settings. The article explains a method for allowing users to switch between themes without relying on the static manifest. It also mentions the possibility of storing user preferences in localStorage for a more personalized experience. However, there is room for improvement in this solution, and the author plans to share the complete implementation, including better handling of theme preference changes. The current solution does not fully support the dynamic switch of light and dark themes but can adapt to system preferences.