reactjs / reactjs/react.dev

CSS Breaking changes with React18

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Dominant language
JavaScript
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Description

There are behavioral difference for CSS in strict mode and without it after upgrading the project to React18. The official document doesn't mention about any possible impact on CSS. Please provide any known changes on CSS with React18.
E.g. class*="MuiButtonBase-root-MuiButton-root" works in strict mode but has to change it to
class*="MuiButtonBase-root MuiButton-root" for it to work without strict mode

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reviewing the issue's React 18, Strict Mode, and CSS class-selector example, then check the existing documentation for related coverage. Done means documenting any confirmed CSS-impacting behavior and clarifying the strict-mode versus non-strict-mode example for readers.

Written by the indexing model from the issue text.

Assessment

Tech stack
javascript, react
Domain
documentation
Issue type
Documentation
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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