You have an input field and a Caclulate button. When user enters a number and presses Calculate button, the fibonacci value should be evaluated and displayed in the div with id 'result' (innerText) in a form Result: evaluated_fibonacci While the value is being evaluated, please, display Calculating... in the div
Please, use web worker for the evaluation. It should receive a data in form of an object {data: someValue}. Result of its work should be a Number.
You have all the necessary files created, please, use them.
Additional task: when evaluation lasts long and user does not wait till it ends, he should be able to start a new evaluation. Pressing Calculate button should stop ongoing calculation and start new.