Full page screenshot in Selenium Python - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of this Selenium Python code snippet?

Consider the following code that attempts to take a full page screenshot using Selenium in Python. What will be the result of running this code?

Selenium Python

from selenium import webdriver
from selenium.webdriver.chrome.service import Service
from selenium.webdriver.chrome.options import Options

options = Options()
options.add_argument('--headless=new')
service = Service()
driver = webdriver.Chrome(service=service, options=options)
driver.get('https://example.com')

# Attempt to take full page screenshot
result = driver.save_screenshot('page.png')
driver.quit()
print(result)

A False (screenshot not saved due to missing permissions)

B True (screenshot saved as 'page.png', but only visible viewport captured)

C Throws an exception because save_screenshot does not exist

D True (full page screenshot saved as 'page.png')

💡 Hint

The save_screenshot method captures only the visible part of the page by default.

The save_screenshot method returns True if the screenshot is saved successfully. However, it captures only the visible viewport, not the full page. To capture the full page, additional steps or tools are needed.

🧠 Conceptual

intermediate

Which Selenium Python approach captures a full page screenshot?

You want to capture a full page screenshot of a webpage using Selenium with Python. Which approach below will correctly capture the entire page, not just the visible viewport?

A Use JavaScript to get page height, resize window, then save_screenshot

B Use driver.execute_script('window.scrollTo(0,0)') then save_screenshot

C Use driver.get_screenshot_as_base64() only

D Use driver.save_screenshot('file.png') directly

💡 Hint

Think about how to make the browser window tall enough to show the entire page.

To capture the full page, you can use JavaScript to get the full page height, resize the browser window to that height, then take a screenshot. This ensures the entire page is visible in the viewport.

🔧 Debug

advanced

Why does this full page screenshot code fail with an error?

This Selenium Python code tries to take a full page screenshot but raises an error. What is the cause?

Selenium Python

from selenium import webdriver
from selenium.webdriver.chrome.service import Service

service = Service()
driver = webdriver.Chrome(service=service)
driver.get('https://example.com')

height = driver.execute_script('return document.body.scrollHeight')
driver.set_window_size(1200, height)
screenshot = driver.get_screenshot_as_file('fullpage.png')
driver.quit()

A execute_script returns None causing set_window_size to fail

B set_window_size is not a valid method on driver

C get_screenshot_as_file requires a full file path, not just filename

D The window height exceeds maximum allowed size causing error

💡 Hint

Browsers limit window size; very tall sizes cause errors.

Browsers have maximum window size limits. Setting window height to the full page height can exceed this limit and cause errors. You need to handle this by scrolling and stitching screenshots or using browser-specific full page screenshot features.

❓ framework

advanced

Which Selenium WebDriver method supports full page screenshots in recent versions?

Recent Selenium WebDriver versions introduced a method to capture full page screenshots directly. Which method is it?

A driver.get_full_page_screenshot_as_file('file.png')

B driver.full_page_screenshot()

C driver.get_full_page_screenshot_as_base64()

D driver.get_screenshot_as_file('file.png')

💡 Hint

Look for a method returning a base64 string with 'full_page' in its name.

Selenium 4.8+ added get_full_page_screenshot_as_base64() to capture full page screenshots as base64 strings. This method captures the entire page, unlike get_screenshot_as_file which captures only the viewport.

❓ assertion

expert

Which assertion correctly verifies a full page screenshot file exists and is not empty?

After taking a full page screenshot saved as 'fullpage.png', which assertion best confirms the file exists and has content?

A assert os.path.exists('fullpage.png') and os.path.getsize('fullpage.png') > 0

B assert os.path.isfile('fullpage.png') == False

C assert os.path.getsize('fullpage.png') == 0

D assert os.path.exists('fullpage.png') and os.path.getsize('fullpage.png') == 0

💡 Hint

File must exist and have size greater than zero.

To verify a screenshot file is created and not empty, check that the file exists and its size is greater than zero bytes.