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Which browsers can encode
The tool looks for VideoEncoder and AudioEncoder before a run. If either is missing, it says so and does not pretend to start. That check is the page you have open, not a compatibility table filled in from memory.
What was actually run
On 2026-10-22 the project check encoded a 2 second clip in desktop Chrome, and the new file landed under a 1 MB ceiling. Firefox and Safari are not in that check. If you open the tool in one of them, believe the sentence on that page.
When the encoder exists and the run still fails
A browser can expose VideoEncoder and still refuse a codec. The page then names the reason it got back (it cannot decode the picture, or it has no encoder it can save). The retry is the same engine at a lower frame height, not a second program.