Why Does My Dark Mode Flicker White on Reload?
Dark Mode Flickers White Background on Reload: Resolving the Lag
Incorporating a dark mode feature often introduces an issue where a white background briefly flashes upon page reload. This occurs due to the delay in applying the dark theme setting, which can be attributed to the order of rendering.
To address this problem, it's crucial to prevent the page from rendering prematurely. By placing a small script tag within the
section, we can block page rendering and ensure the dark theme attribute is assigned to the before continuation.This script should be included at the beginning of the
, taking precedence over any other tags:<code class="html"><head>
<script>
// Place this in <HEAD> top before other tags
const setTheme = (theme) => {
theme ??= localStorage.theme || "light";
document.documentElement.dataset.theme = theme;
localStorage.theme = theme;
};
setTheme();
</script>
<!-- meta, title, etc... -->
</head></code>Subsequently, it's recommended to place any other scripts in a non-render-blocking manner, right before the closing tag. This will prevent them from interrupting the theme assignment process:
<code class="html"><script src="js/index.js"></script> <!-- other <script> tags here --> <!-- Closing </body> and </html> go here --></code>
Within the js/index.js file, the following code will toggle the dark mode theme:
<code class="js">const elToggleTheme = document.querySelector('#dark-mode-button input[type="checkbox"]');
elToggleTheme.checked = localStorage.theme === "dark";
elToggleTheme.addEventListener("change", () => {
const theme = elToggleTheme.checked ? "dark" : "light";
setTheme(theme);
});</code>By implementing these steps, the white background flicker during page reload can be effectively eliminated, ensuring a seamless transition to dark mode.
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