Chrome Flags Reference

--show-property-changed-rects

What does --show-property-changed-rects do?

Show rects in the HUD around layers whose properties have changed.

Usage

chrome --show-property-changed-rects

const browser = await puppeteer.launch({
  args: ['--show-property-changed-rects']
});

const browser = await chromium.launch({
  args: ['--show-property-changed-rects']
});

from selenium import webdriver

options = webdriver.ChromeOptions()
options.add_argument('--show-property-changed-rects')

driver = webdriver.Chrome(options=options)