It appears that some parsers are trying to retrieve the title of a page without striping off HTML comments first.

This is stupidily funny :)

“Flash Of Default Theme”

See https://mxb.dev/blog/color-theme-switcher/

I had to move the theme definition to the html element (vs. body) with the side-effect to have a consistent scrollbar color.

Stored using localStorage

Somehow, I managed to forget that essential line…