HTMLMediaElement: controller property
Deprecated
Avoid using this feature in new projects.
The MediaController API was dropped from the specification due to lack of implementations.
This feature may be a candidate for removal from web standards or browsers.
Non-standard: This feature is not standardized. We do not recommend using non-standard features in production, as they have limited browser support, and may change or be removed. However, they can be a suitable alternative in specific cases where no standard option exists.
The HTMLMediaElement.controller property represents the media controller assigned to the element.
Value
A MediaController object or null if no media controller is assigned to the element. The default is null.
Specifications
In 2016, the whole Media Controller feature was removed from the HTML specification. It is no longer on track to become a standard.