@Xingjin-An That is very often internally discussed API thing. We are finishing some huge projects right now, so we will try to focus on API later. Thanks for your feedback.
This can be caused by anything. But my first idea was that Windy API uses modified CSS. If you are doing everything right, try to check if it is not hidden by CSS. Otherwise, it would be great if you can provide us with some working example (only leaflet, without Windy) and even with non-working example (including Windy).
Yo tuve ese mismo problema y me di cuenta que es el conficto de CSS, osea el CSS de leaftlet con el de windy, me funciona el mapa sin el CSS de leaflet, pero no se el progreso del play abajo.
