How to wait for page to load in Playwright?

When scraping dynamic web pages with Playwright and Python we need to wait for the page to fully load before we retrieve the page source. Using Playwright's wait_for_selector() method we can wait for a specific element to appear on the page which indicates that the web page has fully loaded and then we can grab the page source:

with sync_playwright() as pw:
    browser = pw.chromium.launch(headless=False)
    context = browser.new_context(viewport={"width": 1920, "height": 1080})
    page = context.new_page()

    # go to url
    # wait for element to appear on the page:
    # get HTML

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