• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Proposed changes

Remove obsolete vendor-prefixed 'transition', 'transform', 'box-sizing', and 'box-shadow' CSS properties.

The versions of these properties without a prefix have been supported by the major browsers for years.

https://caniuse.com/?search=transition

https://caniuse.com/?search=transform

https://caniuse.com/css3-boxsizing

https://caniuse.com/css-boxshadow

I tested this on a Mac using Chrome, Safari, and Firefox and found no issues. Please test it in other browsers and operating systems before considering merging this PR.

Checklist

• I have read the contribution guidelines
• For non-bugfix PRs, I have discussed this change on the forum/slack team.
• I have run npm run test to verify the unit tests pass
• I have added suitable unit tests to cover the new/changed functionality