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Modernizr
Modernizr is a JavaScript library that detects HTML5 and CSS3 features in the user’s browser.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Unfortunately, Safari already supports gap in grid, so this doesn't work. This is one of those weird cases where there is no easy CSS-only solution, though there have been proposals for workarounds.
This has left me scratching my head. You could polyfill with JavaScript or use PostCSS, but at this point, is it worth it? That's a question that all frontend developers have to weigh from time to time, and there's no one-size-fits-all answer.
NOTE:
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