5 best open source tools for cross-browser CSS testing - LogRocket Blog
Briefly

CSS inconsistencies across browsers occur due to unique rendering engines used by browsers like Chrome, Safari, and Firefox. Each of these browsers interprets CSS differently, leading to layout and animation discrepancies. To combat these issues, developers must engage in cross-browser testing, which ensures that their designs appear consistently across various platforms. Many tools can aid in this testing process, enabling developers to find and resolve CSS issues effectively. This article emphasizes the importance of such testing and outlines several free tools to streamline the process.
Different browsers don't always interpret CSS the same way. Chrome, Edge, Safari, and Firefox each use their own rendering engines, which can lead to unexpected differences in layout, spacing, and animations.
Cross-browser testing matters. Catching issues early saves hours of debugging and ensures users get a good experience, no matter which browser they use.
There are powerful tools that can do the heavy lifting so you don't have to test manually on every browser and device.
Playwright is an open source testing framework that automates browser interactions across Chromium, WebKit, and Firefox, ensuring consistent CSS rendering.
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