[Webkit-unassigned] [Bug 225783] New: PCM: How can I check if PCM feature is enabled in a given Safari instance?

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=225783

            Bug ID: 225783
           Summary: PCM: How can I check if PCM feature is enabled in a
                    given Safari instance?
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mwei at pinterest.com

May I ask if Safari could tell me programmatically that whether PCM is enabled in a given Safari instance?
The reason why I am asking is because currently only PCM is launched in iOS 14.5 and not yet on older version of iOS and MacOS. Thus, we would like to assess the coverage of PCM on all our offsite events.
Google's Chrome is provide a javascript function like this below. 

function isConversionMeasurementEnabled() {
   var isChrome = !!window.chrome && (!!window.chrome.webstore || !!window.chrome.runtime);
  return isChrome && !!document.featurePolicy && !!document.featurePolicy.features() && document.featurePolicy.features().includes('conversion-measurement');
}

Thanks
Maojie

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