When landing on https://stats.wikimedia.org/v2/, the heading has a certain size and is generally not bolded. When navigating around to different views and pages, it stays constant.
Except when accessing a page with a map, when it suddenly becomes bolded:
Page with a map | All other pages |
---|---|
Once this page has been visited, the heading stays bolded until the page is refreshed. Presumably due to navigation being implemented in JavaScript, and the additional styles staying active.