Selenium Python - Advanced Patterns
Identify the error in this Selenium Python code for performance metrics:
start = driver.execute_script('window.performance.timing.navigationStart')
print(start)
Identify the error in this Selenium Python code for performance metrics: start = driver.execute_script('window.performance.timing.navigationStart') print(start)
medium📝 Debug Q6 of 15
Step-by-Step Solution
Solution:
Step 1: Check JavaScript execution syntax
execute_script requires 'return' to get value back from JS.Step 2: Identify missing return causes None result
Without 'return', start will be None or undefined in Python.Final Answer:
Missing 'return' keyword in execute_script -> Option AQuick Check:
Always use 'return' in execute_script [OK]
Quick Trick: Always include 'return' in JS for execute_script [OK]
Common Mistakes:
- Omitting 'return'
- Using wrong JS property
- Assuming print can't show JS values
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