#DOM Operations For instructions on how to run the tests, check the following link: https://github.com/TelerikAcademy/JavaScript-UI-and-DOM/blob/master/README.md#user-content-preparing-the-local-machine-for-unit-testing-with-mocha-and-chai

##Task 1 Create a function that takes an id or DOM element and:

• If an id is provided, select the element
• Finds all elements with class button or content within the provided element
  • Change the content of all .button elements with "hide"
• When a .button is clicked:
  • Find the topmost .content element, that is before another .button and:
    • If the .content is visible:
      • Hide the .content
      • Change the content of the .button to "show"
    • If the .content is hidden:
      • Show the .content
      • Change the content of the .button to "hide"
    • If there isn't a .content element after the clicked .button and before other .button, do nothing
• Throws if:
  • The provided DOM element is non-existant
  • The id is either not a string or does not select any DOM element