On pages like https://wikimediafoundation.org/wiki/Thank_You/Poongothai_Balasubramanian , there is a YouTube video. Underneath that, there is a "view on Wikimedia Commons" JavaScript link. However, clicking it turns the element all black. It does not correctly load the TimedMediaHandler viewer.
As a workaround, it could be changed to actually link to Commons if the dynamic swap proves complex to fix.
Version: wmf-deployment
Severity: normal