fid-safari.html

		<script>
			!function(){var e,t,n,i,r={passive:!0,capture:!0},a=new Date,o=function(){i=[],t=-1,e=null,f(addEventListener)},c=function(i,r){e||(e=r,t=i,n=new Date,f(removeEventListener),u())},u=function(){if(t>=0&&t<n-a){var r={entryType:"first-input",name:e.type,target:e.target,cancelable:e.cancelable,startTime:e.timeStamp,processingStart:e.timeStamp+t};i.forEach((function(e){e(r)})),i=[]}},s=function(e){if(e.cancelable){var t=(e.timeStamp>1e12?new Date:performance.now())-e.timeStamp;"pointerdown"==e.type?function(e,t){var n=function(){c(e,t),a()},i=function(){a()},a=function(){removeEventListener("pointerup",n,r),removeEventListener("pointercancel",i,r)};addEventListener("pointerup",n,r),addEventListener("pointercancel",i,r)}(t,e):c(t,e)}},f=function(e){["mousedown","keydown","touchstart","pointerdown"].forEach((function(t){return e(t,s,r)}))},p="hidden"===document.visibilityState?0:1/0;addEventListener("visibilitychange",(function e(t){"hidden"===document.visibilityState&&(p=t.timeStamp,removeEventListener("visibilitychange",e,!0))}),!0);o(),self.webVitals={firstInputPolyfill:function(e){i.push(e),u()},resetFirstInputPolyfill:o,get firstHiddenTime(){return p}}}();
		</script>
	
		<script type="module">
			import {onCLS, onFID, onLCP} from 'https://unpkg.com/web-vitals@3/base?module';

			// onCLS(console.log);
			onFID(console.log);
			// onLCP(console.log);
		</script>