It comprises a subset of the Matroska multimedia container format.
I wrote from the beginning that WebM includes a specification of a subset of Matroska it uses but that the WebM specifications also include which audio and video formats it uses. https://www.webmproject.org/about/ 100% confirms what I wrote.
You should just accept it and move on. I’m certainly moving on because discussing with someone over WebM who doesn’t even accept the contents of https://www.webmproject.org/about/ is pointless.
I wrote from the beginning that WebM includes a specification of a subset of Matroska it uses but that the WebM specifications also include which audio and video formats it uses. https://www.webmproject.org/about/ 100% confirms what I wrote.
You should just accept it and move on. I’m certainly moving on because discussing with someone over WebM who doesn’t even accept the contents of https://www.webmproject.org/about/ is pointless.
https://www.webmproject.org/docs/container/