Cross-Browser Compatibility

Cross-browser compatibility is the quality of a website rendering and behaving consistently across different browsers, engines and versions, such as Chrome, Safari, Firefox and Edge, on both desktop and mobile.

Why it matters

Browsers implement standards at different speeds and have their own bugs. A layout that looks right in one can break in another, and Safari on iPhone often lags on newer features. Reports of a page being down for some users are sometimes compatibility failures rather than outages.

Example

A script uses a newer feature:

if ('IntersectionObserver' in window) {
  watchImages();
} else {
  loadAllImages();
}

Feature detection like this is safer than checking the browser name, because it adapts to whatever the browser supports.

Common mistakes

Testing only in your own browser.
Sniffing user-agent strings rather than detecting features.
Supporting browsers that fewer than a tiny percentage of your visitors use.

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