It's certainly not the primary driver. Twitter is built using React Native for Web, which uses a pattern called "Atomic CSS".[1] So it's just a result of the framework they're using.
[1] https://github.com/necolas/react-native-web/blob/master/docs...
In Building the New Twitter.comnecolas
react-native-web
JavaScript2015–2023
necolas / react-native-web
react-native-web
Cross-platform React UI packages
45Distinct people
51Mentions
0Explicit recommenders
22.2KGitHub stars
What to know before exploring
What it is
Cross-platform React UI packages
GitHub
Where it is used
No documented product use was verified in the last source check.
What people are saying
No recommendation phrase was found in the indexed comments.
No classified warning is attached to this page. Read the discussions before treating silence as approval.
Also in these discussions
- microsoft/react-native-windows · linked in 3 of the same discussions
- ptmt/react-native-macos · linked in 3 of the same discussions
- facebookarchive/react-360 · linked in 2 of the same discussions
Mentioned in the same Hacker News threads. That is not proof they are substitutes.
This week on Hacker News
Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 7:02:50 PM UTC.
No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.
Mentions over time
HN mentions by year51 dated mentions
Observed mentions: 2015-09-17 14:29:41 UTC to 2023-01-31 20:46:17 UTC.
Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.
View mention counts and date ranges
| Period | Start (UTC) | End (exclusive, UTC) | Mentions | Submissions | Comments |
|---|---|---|---|---|---|
| 2015 | 2015-01-01 00:00:00 UTC | 2016-01-01 00:00:00 UTC | 3 | 0 | 3 |
| 2016 | 2016-01-01 00:00:00 UTC | 2017-01-01 00:00:00 UTC | 12 | 1 | 11 |
| 2017 | 2017-01-01 00:00:00 UTC | 2018-01-01 00:00:00 UTC | 14 | 0 | 14 |
| 2018 | 2018-01-01 00:00:00 UTC | 2019-01-01 00:00:00 UTC | 7 | 1 | 6 |
| 2019 | 2019-01-01 00:00:00 UTC | 2020-01-01 00:00:00 UTC | 6 | 0 | 6 |
| 2020 | 2020-01-01 00:00:00 UTC | 2021-01-01 00:00:00 UTC | 3 | 0 | 3 |
| 2021 | 2021-01-01 00:00:00 UTC | 2022-01-01 00:00:00 UTC | 5 | 0 | 5 |
| 2022 | 2022-01-01 00:00:00 UTC | 2023-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2023 | 2023-01-01 00:00:00 UTC | 2024-01-01 00:00:00 UTC | 1 | 0 | 1 |
From the project README
An excerpt from the repository, fetched Nov 13, 2026.
Read the project’s introduction
Development monorepo
This is the development monorepo for "React Native for Web" and related projects.
Structure
.github
Contains workflows used by GitHub Actions.
Contains issue templates.
packages
react-native-web
Contains the individual packages managed in the monorepo.
scripts
Contains Node.js scripts for miscellaneous tasks.
Tasks
build
Use npm run build to run the build script in every package.
Use npm run build -w <package-name> to run the build script for a specific package.
dev
Use npm run dev to run the dev script in every package.
Use npm run dev -w <package-name> to run the dev script for a specific package.
test
Use npm run test to run tests for every package.
More details can be found in the contributing guide below.
Contributing
Development happens in the open on GitHub and we are grateful for contributions including bugfixes, improvements, and ideas.
Code of conduct
This project expects all participants to adhere to Meta's OSS Code of Conduct. Please read the full text so that you can understand what actions will and will not be tolerated.
Contributing guide
Read the contributing guide to learn about the development process, how to propose bugfixes and improvements, and how to build and test your changes to React Native for Web.
Good first issues
To help you get you familiar with the contribution process, there is a list of good first issues that contain bugs which have a relatively limited scope. This is a great place to get started.
Read the full README on GitHubWhat Hacker News says
6 sourcesOpening in React devtools shows a number of hints[1]. "React Native Style Editor" section. "View" components with numeric "style" props. And the classname prefixes "css-" and "r-" match the generated identifiers from react-native-web[2].
[1]: https://imgur.com/lFUvL7P
[2]: https://github.com/necolas/react-native-web/blob/45f94eb43da...
In Building the New Twitter.comThis strong sign of the confidence Twitter has in React Native for Web[1]. In 2017, Nicolas Gallagher gave a talk[2] about why it was used for mobile.twitter.com.
[1]: https://github.com/necolas/react-native-web
[2]: https://www.youtube.com/watch?v=tFFn39lLO-U
In Building the New Twitter.comIt isn't possible to write React once, and test it on all platforms, right? (iOS + Android + web)
Why doesn't the React team do an official release of https://github.com/necolas/react-native-web instead of leaving it on the community to support?
In Announcing React Native 0.60Not sure exactly what you mean by React NativeJS but perhaps React Native for Web (https://github.com/necolas/react-native-web) is along the lines of what you are thinking?
Works remarkably well. It’s already used for Twitter’s mobile site
In You probably don't need a single-page app