Responded to @kasparsd:
Here is the relevant issue for adding this to the HTML spec https://github.com/whatwg/html/issues/6636 and a guide from Google on how to implement now https://web.dev/articles/lazy-loading-video
Responded to @kasparsd:
Here is the relevant issue for adding this to the HTML spec https://github.com/whatwg/html/issues/6636 and a guide from Google on how to implement now https://web.dev/articles/lazy-loading-video