j9t’s Twitter Archive—№ 3,361

Option 2 is correct: “As a general rule, user agents are urged to be 👉 conservative rather than optimistic.” The spec continues with an example: “For example, it would be bad to report that everything had been buffered when it had not.” html.spec.whatwg.org/multipage/media.html#best-practices-for-implementers-of-media-elements