CSS Feature Toggles is a css extension for chrome. it's a free extension , it has 1,000+ active users since released its first version, it earns an average rating of 5.00 from 4 rated user, last update is 1730 days ago.
This extension allows developers to disable support of modern CSS features from devtools. Disabling features such as flexbox, grid or blend-modes allows developers to see how their pages/apps will render in browsers that don't support them.
You could download the latest version crx file or older version files and install it.
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You could find more help information from css feature toggles support page.
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Useful extension for testing how your site/app can look on browsers which don't support certain features.