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Specify "time origin" computation The time origin, which is the epoch for all performance timeline APIs, was previously defined in https://w3c.github.io/hr-time/#dfn-time-origin. This makes its computation explicit, without changing its current definition and behavior. Notably: * "time origin becomes an environment settings object algorithm, computed differently for windows vs. worker scopes. * The 4 places where this timestamp is set are creation of an about:blank browsing context, the beginning of navigation, the confirmation of an unload prompt, and the creation of a worker. * The timestamp is a "shared monotonic clock" value, which is defined in HR-TIME (and internally in ECMAScript). As part of this PR, also refactored unload prompts to return a result rather than rely on a somewhat hand-wavy "refused to allow" property. See https://github.com/w3c/hr-time/issues/131 and https://github.com/w3c/navigation-timing/issues/166. See also

Noam Rosenthal