Hi webkit-dev, I would like to add platform timestamps to DOM events as the systemTime property. I have a patch implementing the feature: https://bugs.webkit.org/show_bug.cgi?id=94987. This will let us know the time at which the system received an event to be able to accurately handle it, whereas the timestamp property gives the time the DOM event was created in an inaccurate milliseconds since 1970 form. This has been discussed on www-dom (http://lists.w3.org/Archives/Public/www-dom/2012OctDec/0028.html) and www-perf ( http://lists.w3.org/Archives/Public/public-web-perf/2012Oct/0046.html) and use cases for this have been discussed ( http://lists.w3.org/Archives/Public/www-dom/2012AprJun/0092.html).
The platform timestamp comes in as a monotonic timestamp. Since the DOM Event spec requires that timeStamp() be a 1970-epoch based timestamp it is not sufficient for a high resolution precise time delta on event delivery. Instead, we add a systemTime property which uses the Performance API spec ( http://dvcs.w3.org/hg/webperf/raw-file/tip/specs/HighResolutionTime/Overview.html) for high res timestamps (time since document load timestamp to avoid user fingerprinting) and provide the platform's high resolution timestamp to ECMAScript. Let me know if you have any suggestions. I look forward to everyone's feedback, cheers! - Rob
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