Intermediate
JavaScript
Q78 / 100
What is a JavaScript realm and its security implication?
Correct! Well done.
Incorrect.
The correct answer is B) Each realm has its own global object and builtins; cross-realm instanceof checks fail, requiring Array.isArray() and structuredClone() workarounds
B
Correct Answer
Each realm has its own global object and builtins; cross-realm instanceof checks fail, requiring Array.isArray() and structuredClone() workarounds
Explanation
An iframe in the same origin has a different realm. obj instanceof Array fails for arrays created in the iframe. Use Array.isArray() for cross-realm safety.
Progress
78/100