This doesn't appear to be in any standard yet. You should probably send something to public-webapps or the whatwg list and make sure others are onboard for the idea before exposing it to the web.
On Wed, Oct 24, 2012 at 6:17 PM, Robert Flack <fla...@chromium.org> wrote: > 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 > > _______________________________________________ > webkit-dev mailing list > webkit-dev@lists.webkit.org > http://lists.webkit.org/mailman/listinfo/webkit-dev > >
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