THE DUMB REASON WHY FLAG EMOJIS AREN'T WORKING ON YOUR SITE IN CHROME ON WINDOWS

Summary from the TLDR Web Dev newsletter

Flag emojis don't render properly in Chrome on Windows because Microsoft's system font doesn't support them, likely due to geopolitical concerns. As a result, Chrome users see country code letters (e.g., "GB" instead of 🇬🇧), while Firefox avoids the issue by using its own emoji font.