web-vitals-google-analytics-bigquery/diagnostics.html

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 you may not use this file except in compliance with the License.
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 See the License for the specific language governing permissions and
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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Web Vitals Test</title>
  <meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>
  <p><img style="max-width: 360px" src="https://placekitten.com/g/3840/2160" alt="Kitten" /></p>
  <p>Text below image</p>

<!-- Global site tag (gtag.js) - Google Analytics -->
<!-- 
**IMPORTANT**

Make sure you replace these script tags with your own GA4 tag
to ensure data is reported to your GA4 property.

-->
<script async src="https://www.googletagmanager.com/gtag/js?id=[REPLACE_WITH_YOUR_ID]}"></script>
<script>
  window.dataLayer = window.dataLayer || [];
  function gtag(){dataLayer.push(arguments);}
  gtag('js', new Date());

  gtag('config', '[REPLACE_WITH_YOUR_ID]');
</script>

<!-- End of script tags to replace  -->

<script type="module">
  import {onCLS, onINP, onLCP} from 'https://unpkg.com/web-vitals@4/dist/web-vitals.attribution.js?module';

  function getDebugInfo(name, attribution) {
    // In some cases there won't be any entries (e.g. if CLS is 0,
    // or for LCP after a bfcache restore), so we have to check first.
    if (attribution) {
      if (name === 'LCP') {
        return {
          debug_url: attribution.url,
          debug_time_to_first_byte: attribution.timeToFirstByte,
          debug_resource_load_delay: attribution.resourceLoadDelay,
          debug_resource_load_time: attribution.resourceLoadTime,
          debug_element_render_delay: attribution.elementRenderDelay,
          debug_target: attribution.element || '(not set)',
        };
      } else if (name === 'INP') {
        return {
          debug_event: attribution.interactionType,
          debug_time: Math.round(attribution.interactionTime),
          debug_load_state: attribution.loadState,
          debug_target: attribution.interactionTarget || '(not set)',
          debug_interaction_delay: Math.round(attribution.inputDelay),
          debug_processing_duration: Math.round(attribution.processingDuration),
          debug_presentation_delay:  Math.round(attribution.presentationDelay),
        };
      } else if (name === 'CLS') {
        return {
          debug_time: attribution.largestShiftTime,
          debug_load_state: attribution.loadState,
          debug_target: attribution.largestShiftTarget || '(not set)',
        }
      }
    }
    // Return default/empty params in case there is no attribution.
    return {
      debug_target: '(not set)',
    };
  }

  
  function sendToGoogleAnalytics({ name, delta, value, id, entries, attribution }) {
    gtag('event', name, {
      // Built-in params:
      value: delta, // Use `delta` so the value can be summed.
      // Custom params:
      metric_id: id, // Needed to aggregate events.
      metric_value: value, // Value for querying in BQ
      metric_delta: delta, // Delta for querying in BQ
      // Send the returned values from getDebugInfo() as custom parameters
        ...getDebugInfo(name, attribution)
    });
  }

  onLCP(sendToGoogleAnalytics);
  onINP(sendToGoogleAnalytics);
  onCLS(sendToGoogleAnalytics);
</script>
</body>
</html>