WebCodecs decode-timing probe. Keep this tab visible and the screen awake for the whole run.
Please keep this tab open and visible. The measurement runs by itself and takes about 30–40 seconds. Nothing to click.
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Paste this code back on the study platform to confirm completion.
What this measures: how fast your browser decodes a few short, identical test video clips (timing only). We record your browser/device characteristics for research grouping. We do not collect your name, account, files, camera, microphone, location, or any personal identifier. See the study description for details and consent.