Question: What value does prompt() return if the user clicked the Cancel button?
Answer: The return value of canceled prompt() depends on the browser.
In some browsers the return value is null, in others it's '' (empty string).
Therefore, you might want to use the following code when calling the
prompt() method:
userInput = prompt('Prompt text','Suggested input');
if (userInput != '' && userInput != null) {
// do something with the input
}
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