app.js queryselectorall code example
Example: queryselector function in javascript
/*The querySelector() method returns the first element that matches a specified
CSS selector(s) in the document. Note: The querySelector() method only returns
the first element that matches the specified selectors. To return all the
matches, use the querySelectorAll() method instead.*/
// for example
//for class
document.querySelector(".ClassName")
// for id
document.querySelector("#ID")
// etc.