This tool measures the cumulative layout shifts that occur when a page is loaded in the browser using data from the Chrome Performance API. These are then listed showing the layout shift score and visualised on the webpage. Green squares show where the element started and red indicates where the element was shifted to.
You can Follow the below Step By Step procedure to install the CLS Checker - Journey Further Chrome Extension to your Chrome Web browser.
It is the CLS Checker - Journey Further Chrome extension download link you can download and install Chrome Browser.
This extension measures Google Core Web Vital Scores
View source is dead. See how the browser renders a page, not just what the server sends.
Measure metrics for a healthy site
Annotate a website with the Core Web Vitals
Visualizer the CLS of any webpage
Test SEO/speed/security of 100s of pages in a click! Check broken links, HTML/JavaScript/CSS, URL redirects, duplicate titles...
Show the Core Web Vitals data from the Chrome User Experience Report in the Google Search Results.
Lighthouse is an open-source, automated tool for improving the performance, quality, and correctness of your web apps.