I know its a beta, but this website was behaving just fine under Mac OS 27 until a day or so ago. Now it has a significant problem. Text is rendered too small and overflows fields when expanded. No issues with Safari on iOS or iPad OS.

Safari in MacOS 27 is now out of beta and still has problems with your web content it has nowhere else. Safari on iOS and iPadOS works fine.

Could you share a screenshot of what you are experiencing?

Sorry I didn't see your request for a screenshot until today. You must have made some adjustments or MacOS 27.0.1 made some changes, but it looks good now. Thanks very much.