Variable fonts with fallback

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technical paper : https://www.zeichenschatz.net/typografie/implementing-a-variable-font-with-fallback-web-fonts.html

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not working ??? https://fonts.google.com/specimen/Roboto+Flex?vfquery=roboto#standard-styles

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Working there, https://v-fonts.com/fonts/roboto-flex so a specific Google issue,