Which of the following is not a JavaScript object?

Which object does the navigator property belong to?

Which object in the browser's API supports the Filesystem API?

Which of the following are JavaScript logging libraries?

 The escape sequence ‘\f’ stands for _________ 

Which of the following functions reads the textual contents of a URL and returns it as a string?

What will be the output of the following JavaScript code?

document.writeln("<br/>screen.width: "+screen.width);

What is the primary use case for middleware in software development?

  When does the function name become optional in JavaScript? 

Which of the following statements about classes and objects is true?