Experience our new AI powered Web and Mobile app building platform 🚀rocket.new. Build any app with simple prompts- no code required.
Sign in
Sign in
Build stable web pages from prompts or figma
Frameworks we support
Integrations we support
Why does a page sometimes reveal its raw structure before styles load? This flicker makes sites feel unstable, frustrating users even if the delay is brief. The blog outlines practical solutions from CSS handling to deeper system factors, helping you trace the cause and apply the right fix with confidence.
When a page loads, you expect the design to appear instantly.
However, sometimes the structure appears first, while the styling lags behind. That gap feels jarring and makes the site look unstable.
Why does such a small delay feel much longer than it really is?
This common issue, often described as unstyle flickering, has frustrated users since the early days of the web. Yet it continues to surface on modern sites.
In this blog, we’ll walk through proven fixes, from front-end styling methods to deeper system causes. By the end, you’ll know how to identify the source and apply the right solution with confidence.
A fouc problem occurs when the HTML loads before the stylesheets have a chance to apply. The browser follows a linear process by parsing the HTML file top-to-bottom, and when CSS files or JavaScript resources are not ready, the page paints with default styling. This creates the flash you see before proper formatting arrives.
The more external requests that are delayed, the longer this unstyled content sits on the screen.
Key causes of flickering issues:
The pain point is that the user's experience breaks before the page is fully loaded. Even if the styling appears after a short pause, the damage is done because the flash was visible. This reduces trust and gives the website an unfinished appearance. Users may even think something is broken and leave the site.
The technical causes of flickering can be traced to both CSS handling and driver rendering. By breaking it down into smaller fixes, you can enhance your website's display for every visitor. This involves not only adjusting how CSS files load but also changing how JavaScript and background assets interact with the rest of the page.
If the flickering persists beyond the browser, then we must also focus on system-level issues tied to Windows and its drivers.
Approach these fixes layer by layer:
Inlining critical CSS in the head tag helps ensure that basic styling loads immediately. By moving only the most important rules into the head and leaving less critical styles for external CSS files, you reduce unstyled content. Preloading or deferring secondary stylesheets allows the page to feel complete from the very first second.
By reducing dependency on external CSS files, you make the layout more stable during the initial render.
Code block:
1<head> 2 <style> 3 body { font-family: Arial, sans-serif; background: #fff; } 4 .main { max-width: 900px; margin: auto; } 5 </style> 6 <link rel="preload" href="style.css" as="style" onload="this.rel='stylesheet'"> 7 <noscript><link rel="stylesheet" href="style.css"></noscript> 8</head> 9
Explanation:
If JavaScript is enabled, you can temporarily hide raw markup until styles apply. This avoids a flash. Although this method delays visibility slightly, it ensures that users only see a styled page. That means no distracting transitions from plain HTML to a styled layout.
Code block:
1document.documentElement.style.display = "none"; 2window.addEventListener("load", function() { 3 document.documentElement.style.display = ""; 4}); 5
Explanation:
Sometimes the underlying issue isn’t the web, but Windows or the graphics driver. If the task manager flickers, this indicates a problem with the display driver. A web-only fix will not help in this case, so focusing on hardware becomes the priority.
The display settings and graphics driver directly influence the stability of your screen.
Steps to fix driver-based flickering:
Table of common flickering issues and fixes:
| Happening on | Possible Cause | Solution |
|---|---|---|
| Web page | css delays | Inline critical css, preload files |
| Blank page | javascript blocking | Defer scripts |
| Task manager flickers | display driver issue | Update or reinstall driver |
| Windows screen flickering | Wrong display settings | Correct refresh rate |
These checks help identify whether the browser or the system causes the flickering issues. Without separating the two, developers often waste time fixing the wrong layer. Adding this diagnostic step can save hours of effort.
Heavy background images or custom fonts can cause an extra shift before loading. Using system fonts or lightweight image formats reduces delays.
A background that loads slowly not only flickers but can also trigger a visible shift in layout. This can frustrate users who see the page change after it already appeared stable.
Best practices:
Here’s how rendering happens in a browser before and after fixes:
Process Explanation
Want to test ideas without touching code? Build any app with simple prompts – no code required. Rocket.new helps you go from concept to loaded app in minutes.
Not every flickering problem comes from the web or CSS. Sometimes the computer itself struggles to keep the screen stable. Outdated device drivers lead to a screen flickering loop that persists even outside the browser.
Checking the task manager helps isolate whether the issue is with a website or a driver problem before spending time debugging.
Key notes:
Dave Hyatt first described the first problem in the early days of Firefox. It was one of the first well-documented rendering quirks faced by web developers. Since then, different solution strategies have been tested, from hiding content with JavaScript to inlining critical CSS.
Despite all the experiments, inline CSS in the head tag remains one of the most reliable methods to avoid FOUC.
Fixing unstyled content isn’t just about a smoother page. It’s about preventing flash, maintaining screen stability, and ensuring a consistent user experience. From CSS loading strategies to updating a display driver, each solution targets a different part of the chain. Address both web-side and windows-side, and the unstyle flickering problem disappears fast.
