Tell us what’s happening:
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User Agent is:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.149 Safari/537.36.
Challenge: Improve Compatibility with Browser Fallbacks
Link to the challenge:
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From the code you have, I can see you have deleted necessary code. Please hit the reset button on the challenge, and start again.
thank you for the reply. i have got the solution myself. thank you very much for offering a help