Element screenshot in Selenium Python - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is an element screenshot in Selenium?

An element screenshot captures an image of a specific web element on a page, not the entire page. It helps focus on the part you want to test or verify visually.

beginner

How do you take a screenshot of a web element using Selenium in Python?

Use the method element.screenshot('filename.png') where element is the web element you want to capture.

beginner

Why is taking an element screenshot useful in testing?

It helps verify the appearance and state of a specific element, like a button or image, without capturing the whole page. This makes tests faster and more focused.

intermediate

What should you ensure before taking an element screenshot?

Make sure the element is visible and fully loaded on the page. Otherwise, the screenshot might be blank or incomplete.

beginner

Write a simple Python Selenium code snippet to take a screenshot of a button with id 'submit'.

from selenium import webdriver
from selenium.webdriver.common.by import By

browser = webdriver.Chrome()
browser.get('https://example.com')
button = browser.find_element(By.ID, 'submit')
button.screenshot('submit_button.png')
browser.quit()

Which Selenium method captures a screenshot of a specific web element?

A element.get_screenshot()

B driver.save_screenshot('file.png')

C driver.get_screenshot_as_file('file.png')

D element.screenshot('file.png')

Only element.screenshot('file.png') captures the screenshot of a specific element. The others capture the whole page or are invalid.

What happens if you try to take an element screenshot when the element is not visible?

A Screenshot captures the whole page instead

B Selenium throws an error

C Screenshot will be blank or incomplete

D Screenshot captures the last visible state

If the element is not visible, the screenshot will be blank or incomplete because there is nothing to capture.

Which of these is NOT a benefit of element screenshots?

A Captures entire webpage layout

B Focused visual verification

C Helps isolate UI issues

D Faster test execution

Element screenshots do NOT capture the entire webpage layout; they only capture the specific element.

In Selenium Python, which object do you call screenshot() on to capture an element screenshot?

A WebElement instance

B WebDriver instance

C Browser instance

D Screenshot utility class

The screenshot() method is called on a WebElement instance representing the element to capture.

What file format is commonly used when saving element screenshots in Selenium?

A .txt

B .png

C .docx

D .json

Screenshots are saved as image files, commonly in PNG format for quality and compatibility.

Explain how to take a screenshot of a specific web element using Selenium in Python and why it is useful.

Think about capturing just one part of the page instead of everything.

Describe common issues you might face when taking element screenshots and how to avoid them.

Consider what happens if the element is hidden or not ready.

Practice

1. What does the element.screenshot('file.png') method do in Selenium Python?

easy

A. Captures a screenshot of only the specific web element.

B. Captures a screenshot of the entire browser window.

C. Saves the HTML source of the element to a file.

D. Highlights the element on the page without saving an image.

Solution

1. Step 1: Understand the method purpose

   The element.screenshot() method captures an image of the specific element, not the whole page.

2. Step 2: Compare with other screenshot methods

   driver.save_screenshot() captures the full page, but element.screenshot() targets only one element.

3. Final Answer:

   Captures a screenshot of only the specific web element. -> Option A

4. Quick Check:

   element.screenshot() = element image capture [OK]

Hint: Remember: element.screenshot saves only that element's image [OK]

Common Mistakes:

• Confusing element screenshot with full page screenshot
• Thinking it saves HTML instead of image
• Using driver.screenshot instead of element.screenshot

2. Which of the following is the correct syntax to save a screenshot of a web element stored in variable button as 'button.png'?

easy

A. driver.screenshot('button.png')

B. button.save_screenshot('button.png')

C. button.screenshot('button.png')

D. button.capture('button.png')

Solution

1. Step 1: Identify the correct method for element screenshot

   The method to save an element's screenshot is element.screenshot(filename).

2. Step 2: Check the variable and filename usage

   Since the element is stored in button, calling button.screenshot('button.png') is correct syntax.

3. Final Answer:

   button.screenshot('button.png') -> Option C

4. Quick Check:

   element.screenshot(filename) = correct syntax [OK]

Hint: Use element.screenshot('file.png') exactly to save element image [OK]

Common Mistakes:

• Using driver.screenshot() for element instead of element.screenshot()
• Using non-existent methods like save_screenshot on element
• Wrong method name like capture()

3. What will happen if you run this code snippet?

element = driver.find_element(By.ID, 'logo')
element.screenshot('logo.png')
print('Screenshot saved')

medium

A. Saves a screenshot of the whole page and prints confirmation.

B. Saves a screenshot of the element with ID 'logo' and prints confirmation.

C. Throws an error because screenshot method is not valid for elements.

D. Prints 'Screenshot saved' but does not save any image.

Solution

1. Step 1: Locate element and call screenshot

   The code finds the element with ID 'logo' and calls element.screenshot('logo.png'), which saves the element's image.

2. Step 2: Confirm output message

   After saving, it prints 'Screenshot saved' confirming the action.

3. Final Answer:

   Saves a screenshot of the element with ID 'logo' and prints confirmation. -> Option B

4. Quick Check:

   element.screenshot() saves image + print confirms [OK]

Hint: element.screenshot saves image; print confirms success [OK]

Common Mistakes:

• Assuming screenshot method is invalid for elements
• Thinking it saves full page instead of element
• Ignoring the print statement output

4. You wrote this code but no screenshot file is created. What is the likely error?

element = driver.find_element(By.CLASS_NAME, 'submit-btn')
element.screenshot()

medium

A. File path is invalid but filename is provided.

B. Incorrect locator type used for find_element.

C. screenshot() method does not exist for elements.

D. Missing filename argument in screenshot() method.

Solution

1. Step 1: Check screenshot method usage

   The screenshot() method requires a filename argument to save the image.

2. Step 2: Identify missing filename

   Since no filename is given, no file is created, causing the issue.

3. Final Answer:

   Missing filename argument in screenshot() method. -> Option D

4. Quick Check:

   screenshot() needs filename to save file [OK]

Hint: Always provide filename in element.screenshot('file.png') [OK]

Common Mistakes:

• Calling screenshot() without filename argument
• Assuming locator type is wrong without checking
• Thinking screenshot() method is invalid for elements

5. You want to verify visually that a specific button is rendered correctly on different browsers by saving its screenshot. Which approach is best to automate this using Selenium Python?

hard

A. Locate the button element and use element.screenshot('button.png') to save its image for comparison.

B. Use driver.save_screenshot('button.png') to capture the whole page and crop manually later.

C. Extract the button's HTML and compare it as text across browsers.

D. Use JavaScript to highlight the button but do not save any image.

Solution

1. Step 1: Identify the goal - visual verification of a button

   To check how the button looks, capturing its image directly is best.

2. Step 2: Choose the method that captures only the button

   element.screenshot() saves the button's image exactly, making comparison easy and automated.

3. Final Answer:

   Locate the button element and use element.screenshot('button.png') to save its image for comparison. -> Option A

4. Quick Check:

   element.screenshot() = best for visual element checks [OK]

Hint: Use element.screenshot() for focused visual testing [OK]

Common Mistakes:

• Capturing full page screenshot and cropping manually
• Comparing HTML text instead of visual appearance
• Not saving any image for visual verification