Question 1

Font Face Observer vs Web Font Loader: which should I use?

Accepted Answer

Font Face Observer is lighter and uses efficient scroll events, ideal for minimal overhead and control. Web Font Loader offers more features like event hooks but is larger. Choose based on whether you need simplicity or comprehensiveness.

Question 2

How to use Font Face Observer with Google Fonts?

Accepted Answer

Include Google Fonts via @font-face rules as usual, then create a FontFaceObserver instance for the font family. Use the load() method to detect when it's available, similar to the README examples with self-hosted fonts.

Question 3

Can Font Face Observer handle font loading failures?

Accepted Answer

Yes, the Promise-based API allows catching rejections on load failures, but it only provides timeout-based detection. You'll need to implement custom fallback logic, such as switching to system fonts, for a robust solution.

Question 4

How to integrate Font Face Observer with React?

Accepted Answer

Use it in React lifecycle methods or hooks like useEffect. Create a FontFaceObserver instance and call load(), then update component state to trigger re-renders when fonts load, as shown in the FOUT example in the README.

Question 5

Does Font Face Observer work with icon fonts?

Accepted Answer

Yes, but you may need a custom test string if the icon font lacks standard characters. Pass the string to the load() method, as mentioned in the README for fonts without latin 'BESbwy' characters.

Question 6

What's the best way to load multiple fonts with Font Face Observer?

Accepted Answer

Create separate instances for each font and use Promise.all() to wait for all loads, as demonstrated in the README. This ensures efficient batch loading without blocking the UI.

Font Face Observer

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