AI BriefingKakaoPage Shares How to Prevent SSR Flicker and Use CSS Variables for Web Dark Mode
Key point
KakaoPage implemented dark mode by controlling body tag classes and CSS variables, resolving flicker with render-blocking scripts.
Details
KakaoPage shared the trial and error and optimization methods encountered while implementing dark mode in web applications. The prefers-color-scheme media query, which simply syncs with system settings, was classified as a not recommended approach due to lack of support on older OS versions and limitations in handling in-app webview environments.
Instead, they recommended controlling the color mode by assigning a class to the body tag. This method allows flexible reflection of localStorage values, app User-Agent information, and system settings by manipulating the DOM with JavaScript.
Key issues to consider during actual implementation include:
- Preventing SSR flicker: To prevent the brief appearance of a light screen before dark mode is applied in CSR environments (FCP stage), a render-blocking script is inserted immediately after the
<body>tag to determine the color mode beforehand. - Using CSS variables: To reduce the hassle of writing two sets of CSS, CSS variables such as
--bg-colorand--text-colorare defined, and their values are changed based on the body class to maintain style consistency.
They emphasized that additional considerations, such as mode-specific handling of image resources, are also necessary, which can reduce user fatigue and increase dwell time.
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