Best way to check if browser supports Framework7

What is the best way to check in JS if the browser will support F7? I want to show a messages to the user if he uses a non supported (older browser).

Thanks in advance!

Check also: android version >=5 and ios version >=12

Good way is to check support of CSS Custom Properties, without them v4+ won’t work. And mainly browsers that support them, already support most of other required features

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That was exactly the solution i had chosen, thanks so much :grin:

Why is it iOS >= 12?
As I remember CSS variables require iOS 10 or higher?

Sorry, my mistake: iOS >= 10.