Opening this site actually crashes my Yabai status bar widget on MacOS. What an unexpected and nice troll. Lol.
It contains the raw byte of 0x1b (ESC) in the title (before [31m), which colors the following text red in the context of a terminal. The browser title is reported to Übersicht, which apparently fails to serialize it to proper JSON and thus crashes simple-bar with a JSON decode error, removing the overview of my spaces. Everything is back to normal once I change my browser tab.