Stop the dropdown chevron flickering in Firefox (develop) - #238
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…the mask mid-rotation Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_011rCHPCdbV5C5dDJjEmMDuy
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Related to T51ENG-2081
Proposed changes
Why are these changes being made?
The chevron is a masked pseudo-element. Firefox does not promote a masked element to its own layer when it transforms, so it repainted the mask on every frame of the rotation, which read as a flicker. Chromium composites it and never showed the problem.
Testing instructions
🤖 Generated with Claude Code