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from playwright.sync_api import sync_playwright
import tkinter
root = tkinter.Tk()
root_ndim_x = root.winfo_screenwidth()
root_ndim_y = root.winfo_screenheight()
with sync_playwright() as p:
browser = p.firefox.launch(headless=True)
context = browser.new_context()
page = browser.new_page()
page.goto('http://example.com')
page.set_viewport_size({'width':root_ndim_x/1,'height':root_ndim_y/1})