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Handling Safari Compatibility in React with CSS Modules


Developing web applications that work seamlessly across different browsers is a common challenge for developers. Each browser has its quirks and behaviors, and Safari is no exception. In this post, we'll dive into a React-based solution to handle Safari-specific styling using CSS Modules.

The Challenge with Safari

Safari, the default browser on Apple devices, sometimes requires different CSS rules to achieve the same look and feel as in browsers like Chrome or Firefox. These differences can range from minor visual discrepancies to significant layout issues. To ensure a consistent user experience, developers need to detect when the app is running in Safari and apply the necessary styles.

Detecting Safari in React

To determine whether the user is on Safari, we can use the navigator.userAgent property within a React component. Here's a snippet of how it can be done:

import { useState, useEffect } from 'react';

const App = () => {
  // Safari Compatibility
  const [isSafari, setIsSafari] = useState(false);

  useEffect(() => {
    const userAgent = navigator.userAgent;
    const isSafari = /^((?!chrome|android).)*safari/i.test(userAgent);
  }, []);
  // ...

In this code, we're using a regular expression to test the navigator.userAgent string. The regex checks if the user agent does not include the words "chrome" or "android" and does contain "safari", which is a common way to detect Safari browsers.

Applying Conditional Styles with CSS Modules

CSS Modules are a popular way to include styles in React components. They allow for local scope and composition of CSS classes, which can be very beneficial for maintaining a large code base. Here's how we can conditionally apply a class using CSS Modules:

import styles from './App.module.less';

const App = () => {
  // Safari detection logic as before...

  const containerClass = [styles.container];
  if (isSafari) {

  return <div className={containerClass.join(' ')}></div>;

In the component, we start with a base container class. If the browser is detected as Safari, we add the safari_container class to the array. We then use join(' ') to concatenate the class names into a single string, which is passed to the className prop of the div.

Defining Safari-Specific Styles

In our App.module.less file, we can define styles that should only apply to Safari browsers. For instance:

.safari_container {
  h1 {
    color: red;

This LESS snippet will turn all h1 elements within elements of class safari_container red, but only in Safari browsers. This approach keeps Safari-specific styles neatly separated and easy to manage.


By detecting the Safari browser within a React component and applying conditional class names with CSS Modules, we can effectively manage browser-specific styling issues. This method allows for a clean and maintainable codebase, ensuring that users have a consistent experience across all platforms.

Remember to test across a variety of browsers and devices to ensure that your web application looks and functions as intended. Happy coding!