CLS calibration comment

Author: paulirish

lighthouse-core/audits/metrics/cumulative-layout-shift.js

@@ -44,10 +44,11 @@ class CumulativeLayoutShift extends Audit {
    */
   static get defaultOptions() {
     return {
-      // Calibrated to assure 0.1 gets a score of 0.9.
-      // see https://www.desmos.com/calculator/se7wby6vgc
+      // Calibrated to assure 0.1 gets a score of 0.9. https://web.dev/cls/#what-is-a-good-cls-score
+      // This 0.1 target score was determined through both manual evaluation and large-scale analysis.
+      // see https://www.desmos.com/calculator/wmcxn7zfhc
       scorePODR: 0.02,
-      scoreMedian: 0.4,
+      scoreMedian: 0.2,
     };
   }