Why is undeclared variable throws an error even in non-strict mode?

JavaScript
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Tell us what’s happening:
I’ve read a lot about strict mode in ES6. Based on my understanding it restricts certain behavior and throw an error when a mistake has been done. One typical example is when you forget to declare a variable (with either var, const, or let keyword), you will get an error of “X is not defined”. But even after I removed the “use strict” directive, it still throws the same error in the challenge. So idk how actually did the strict mode make a difference in this case.

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Challenge: Explore Differences Between the var and let Keywords

Link to the challenge:

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You have no code in your question.

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By default, the freeCodeCamp editor runs all code in strict mode.

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Got it! Thanks a million!

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