Why cross-browser ensures compatibility in Selenium Python - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to open a browser using Selenium WebDriver.

Selenium Python

from selenium import webdriver

driver = webdriver.[1]()
driver.get('https://example.com')
driver.quit()

Drag options to blanks, or click blank then click option'

AChrome

BFirefox

CSafari

DEdge

Attempts:

3 left

💡 Hint

Common Mistakes

Using a browser name that is not installed or supported.

Forgetting to import webdriver.

The webdriver.Chrome() command opens the Chrome browser for testing.

2fill in blank

medium

Complete the code to check the page title after loading a URL.

Selenium Python

from selenium import webdriver

driver = webdriver.Firefox()
driver.get('https://example.com')
assert driver.title [1] 'Example Domain'
driver.quit()

Drag options to blanks, or click blank then click option'

A<

B>

C==

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using assignment operator = instead of comparison.

Using wrong comparison operators like !=.

The assertion checks if the page title exactly matches 'Example Domain' using ==.

3fill in blank

hard

Fix the error in the code to find an element by its ID.

Selenium Python

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

driver = webdriver.Edge()
element = driver.find_element(By.[1], 'submit-button')
element.click()
driver.quit()

Drag options to blanks, or click blank then click option'

ACLASS_NAME

BID

CNAME

DTAG_NAME

Attempts:

3 left

💡 Hint

Common Mistakes

Using By.NAME or By.CLASS_NAME when the element has an ID.

Forgetting to import By.

To find an element by its ID, use By.ID.

4fill in blank

hard

Fill both blanks to create a test that opens Firefox and checks the page title.

Selenium Python

from selenium import webdriver

driver = webdriver.[1]()
driver.get('https://example.com')
assert driver.title [2] 'Example Domain'
driver.quit()

Drag options to blanks, or click blank then click option'

AFirefox

B!=

C==

DChrome

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong browser name or wrong comparison operator.

Mixing up != and ==.

The test opens Firefox browser and asserts the title equals 'Example Domain'.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps browser names to their WebDriver instances if the browser name length is greater than 5.

Selenium Python

from selenium import webdriver

browsers = ['Chrome', 'Firefox', 'Edge', 'Safari']
drivers = { [1]: webdriver.[2]() for [1] in browsers if len([1]) [3] 5 }

Drag options to blanks, or click blank then click option'

Abrowser

BChrome

C>

DFirefox

Attempts:

3 left

💡 Hint

Common Mistakes

Using the same blank token for different variables incorrectly.

Using wrong comparison operator or wrong browser name.

This comprehension creates a dictionary with keys as browser names and values as WebDriver instances for browsers with names longer than 5 characters.

Practice

1. Why is cross-browser testing important in Selenium Python?
Cross-browser testing means testing your website on different browsers. What is the main reason for doing this?

easy

A. To make sure the website works correctly on all popular browsers

B. To test only the speed of the website

C. To check the website's content spelling

D. To reduce the number of test cases

Solution

1. Step 1: Understand cross-browser testing purpose

   Cross-browser testing checks if a website works well on different browsers like Chrome, Firefox, Safari, etc.

2. Step 2: Identify the main goal

   The main goal is to find browser-specific issues so users have a good experience everywhere.

3. Final Answer:

   To make sure the website works correctly on all popular browsers -> Option A

4. Quick Check:

   Cross-browser testing = Compatibility check [OK]

Hint: Think: Does it work everywhere? That's cross-browser testing [OK]

Common Mistakes:

• Confusing speed testing with compatibility testing
• Thinking it only checks spelling or content
• Assuming it reduces test cases

2. Which Selenium Python code snippet correctly opens a Firefox browser for cross-browser testing?

easy

A. driver = webdriver.Edge()

B. driver = webdriver.Firefox()

C. driver = webdriver.Safari()

D. driver = webdriver.Chrome()

Solution

1. Step 1: Identify the correct WebDriver for Firefox

   In Selenium Python, to open Firefox, you use webdriver.Firefox().

2. Step 2: Check other options

   Other options open different browsers: Chrome, Safari, Edge, so they are incorrect for Firefox.

3. Final Answer:

   driver = webdriver.Firefox() -> Option B

4. Quick Check:

   Firefox driver = webdriver.Firefox() [OK]

Hint: Match browser name exactly with webdriver class [OK]

Common Mistakes:

• Using Chrome driver code for Firefox
• Confusing Safari and Edge drivers
• Missing parentheses in driver initialization

3. What will be the output of this Selenium Python code snippet when run on Chrome and Firefox?

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

driver = webdriver.Chrome()
driver.get('https://example.com')
text = driver.find_element(By.TAG_NAME, 'h1').text
driver.quit()
print(text)

medium

A. Prints the text inside the first <h1> tag on example.com

B. Throws an error because Chrome driver is not closed

C. Prints the URL of the page

D. Prints nothing because find_element is wrong

Solution

1. Step 1: Understand the code flow

   The code opens Chrome, loads example.com, finds the first <h1> tag, gets its text, closes the browser, then prints the text.

2. Step 2: Analyze output

   The printed output is the text inside the first <h1> tag on example.com, which is usually "Example Domain".

3. Final Answer:

   Prints the text inside the first <h1> tag on example.com -> Option A

4. Quick Check:

   find_element(By.TAG_NAME, 'h1').text = header text [OK]

Hint: find_element(By.TAG_NAME, 'h1').text prints header text [OK]

Common Mistakes:

• Thinking driver.quit() stops print output
• Confusing element text with URL
• Assuming find_element syntax is wrong

4. Identify the error in this Selenium Python code snippet meant for cross-browser testing:

from selenium import webdriver

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

medium

A. Incorrect URL format

B. Indentation error on driver.get line

C. driver.quit() is missing

D. Missing parentheses after webdriver.Chrome

Solution

1. Step 1: Check driver initialization

   The code uses webdriver.Chrome without parentheses, so it does not create a driver instance.

2. Step 2: Check other lines

   URL format is correct, driver.quit() is present.

3. Step 3: Identify the main error

   Missing parentheses cause a TypeError because webdriver.Chrome is a class, not an instance.

4. Final Answer:

   Missing parentheses after webdriver.Chrome -> Option D

5. Quick Check:

   webdriver.Chrome() needs parentheses [OK]

Hint: Always add () to create WebDriver instance [OK]

Common Mistakes:

• Forgetting parentheses after driver class
• Ignoring indentation errors
• Assuming quit() is missing

5. You want to ensure your Selenium Python tests run on Chrome, Firefox, and Edge to catch browser-specific issues. Which approach best supports this cross-browser testing?

hard

A. Test only on Chrome because it is the most popular browser

B. Write separate test scripts for each browser and run them manually

C. Use Selenium WebDriver with a loop to run the same test on each browser automatically

D. Run tests only on Firefox and ignore others

Solution

1. Step 1: Understand cross-browser testing automation

   Running the same tests on multiple browsers automatically saves time and finds browser-specific bugs.

2. Step 2: Evaluate options

   Writing separate scripts is slow and error-prone. Testing only one or two browsers misses issues on others.

3. Step 3: Best practice

   Using a loop or framework to run tests on Chrome, Firefox, and Edge automatically is efficient and effective.

4. Final Answer:

   Use Selenium WebDriver with a loop to run the same test on each browser automatically -> Option C

5. Quick Check:

   Automate tests on all browsers = best cross-browser testing [OK]

Hint: Automate tests on all browsers using loops [OK]

Common Mistakes:

• Testing only one browser
• Running tests manually for each browser
• Ignoring Edge or other popular browsers