Why does executeAsyncScript require a callback function instead of returning a value directly like executeScript?

hard📝 Conceptual Q10 of 15

Selenium Java - JavaScriptExecutor

Why does executeAsyncScript require a callback function instead of returning a value directly like executeScript?

ABecause Selenium does not support synchronous scripts

BBecause async scripts may wait for events and must signal completion explicitly

CBecause JavaScript cannot return values directly

DBecause callback improves script performance

Step-by-Step Solution

Solution:

Step 1: Understand async script nature
Async scripts may wait for timers, events, or AJAX calls before finishing.
Step 2: Need for explicit completion signal
Callback function tells Selenium when the async script is done and what value to return.
Final Answer:
Because async scripts may wait for events and must signal completion explicitly -> Option B
Quick Check:
Async scripts need explicit completion signal [OK]

Quick Trick: Async scripts signal completion via callback [OK]

Common Mistakes:

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