System.InvalidOperationException: Default font family name can't be null or empty · Issue #4427 · AvaloniaUI/Avalonia · GitHub
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UWP C# How can I get a list of the available font weights and styles for a font family? - Microsoft Q&A
font-family: -apple-system,system-ui,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif · Issue #665 · necolas/normalize.css · GitHub
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system-ui" CSS font-family in Chrome doesn't recognize font-weight above certain font sizes on macOS - Stack Overflow
![System Font Stack: its history and rationale | by MasaKudamatsu | Web Dev Survey from Kyoto | Medium System Font Stack: its history and rationale | by MasaKudamatsu | Web Dev Survey from Kyoto | Medium](https://miro.medium.com/v2/resize:fit:1400/1*P-6YoOISKbby-658upQ32g.png)