Update README.md

README.md

@@ -13,6 +13,7 @@ A curated list of snippets to get Web Performance metrics to use in the browser
  - [Resources hints](#resources-hints)
  - [Find Above The Fold Lazy Loaded Images](#find-above-the-fold-lazy-loaded-images)
  - [Find non Lazy Loaded Images outside of the viewport](#find-non-lazy-loaded-images-outside-of-the-viewport)
+ - [Find render-blocking resources](#find-render-blocking-resources)
  - [Image Info](#image-info)
  - [Fonts Preloaded, Loaded, and Used Above The Fold](#fonts-preloaded-loaded-and-used-above-the-fold)
  - [First And Third Party Script Info](#first-and-third-party-script-info)
@@ -255,6 +256,20 @@ console.log(
 );
 ```
 
+### Find render-blocking resources
+
+List all resources that are blocking rendering.
+
+```js
+function findRenderBlockingResources() {
+ return window.performance.getEntriesByType('resource')
+ .filter(({renderBlockingStatus}) =>
+ renderBlockingStatus === 'blocking');
+}
+
+console.log(findRenderBlockingResources());
+```
+
 ### Image Info
 
 List all image resources and sort by (`name, transferSize, encodedBodySize, decodedBodySize, initiatorType`)