When I mouse over Filter in the navigation entry on https://trilarion.github.io/opensourcegames/ the menu entries show up, By category, by code language, by OS support, GitHub stars top 50, Playable browser games, Open code + artwork, and For Kids.
Mousing over each entry shows each corresponding link, which all can be retrieved successfully when memorized and typed manually. Clicking on each entry immediately closes the menu and does not take me to the link.
Not sure if JavaScript is needed for the working of the navigation bar and the browser you used first might have turned that off. I should maybe think about an alternative that might also work without JavaScript. This is part of Bulma.
When I mouse over Filter in the navigation entry on https://trilarion.github.io/opensourcegames/ the menu entries show up, By category, by code language, by OS support, GitHub stars top 50, Playable browser games, Open code + artwork, and For Kids.
Mousing over each entry shows each corresponding link, which all can be retrieved successfully when memorized and typed manually. Clicking on each entry immediately closes the menu and does not take me to the link.