Chrome Flags Reference

Chrome command line switches and startup flags for automation, headless mode, and debugging.

--log-best-effort-tasks

What does --log-best-effort-tasks do?

Logs information about all tasks posted with TaskPriority::BEST_EFFORT. Use this to diagnose issues that are thought to be caused by TaskPriority::BEST_EFFORT execution fences. Note: Tasks posted to a non-BEST_EFFORT UpdateableSequencedTaskRunner whose priority is later lowered to BEST_EFFORT are not logged.

Usage

CLILaunch Chrome with --log-best-effort-tasks using CLI

chrome --log-best-effort-tasks

PuppeteerLaunch Chrome with --log-best-effort-tasks using Puppeteer

const browser = await puppeteer.launch({
  args: ['--log-best-effort-tasks']
});

PlaywrightLaunch Chrome with --log-best-effort-tasks using Playwright

const browser = await chromium.launch({
  args: ['--log-best-effort-tasks']
});

SeleniumLaunch Chrome with --log-best-effort-tasks using Selenium

from selenium import webdriver

options = webdriver.ChromeOptions()
options.add_argument('--log-best-effort-tasks')

driver = webdriver.Chrome(options=options)