Is it necessary to include the Roboto font when using MUI?

After reviewing the Material UI documentation, it appears that users are responsible for loading the Roboto font:

Material UI is designed to use the Roboto font by default. You may add it to your project with npm or yarn via Fontsource, or with the Google Fonts CDN.

The Roboto font will not be automatically loaded by MUI. You are responsible for loading any fonts used in your application.

Despite not seeing any explicit loading of the Roboto font in their example project (such as the vitejs one), when running npm run dev, the text displays correctly with the Roboto font.

Curiously, there is no sign of the Roboto font being loaded in the index HTML page, neither a 

<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:300,400,500,700&display=swap"/>
in the header nor an @font-face in the inline styles.

This raises the question of where exactly does the Roboto font come from? Could it be included by default on modern devices like my Ubuntu laptop running Firefox?

cssreactjsmaterial-uifontsroboto

Answer №1

TL;DR

No, you do not have to install the Roboto font to use MUI, as it comes with fallback options (and you can customize the typography globally). However, for consistency and adherence to Google's Material Design guidelines, you may choose to install it.

If you're seeing a different font than Roboto, it is likely the system's default sans-serif font acting as a fallback. While they may look similar at first glance, upon closer inspection, differences in rounding, spacing, etc., become apparent.

CodeSandbox - MUI with Roboto loaded
https://i.sstatic.net/SeJcg.png

CodeSandbox - MUI without Roboto loaded
https://i.sstatic.net/qY7UZ.png

Pre-installed OSes

Roboto is typically pre-installed only on Android OS.

Not included by default:

(I couldn't find a definitive list of pre-installed fonts for Ubuntu)

Confirming on Firefox

In Firefox, inspect an element and check the "Fonts Used" section under the "Fonts" panel to see the rendered font.

Confirming on Chrome

In Chrome, inspect an element and check the "Rendered Fonts" section in the "Computed" tab to view the rendered font.

Interesting fact -- Firefox has had issues with font loading/rendering in the past, which is why some developers still prefer using Chrome for development.

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