How does FizzBuzz work?

                            //CONTROLLER FUNCTION

                            function getValues() {
                            
                                //Get "Fizz" and "Buzz" values from the user via the fields on the app page.
                                let fizzValue = document.getElementById("fizzValue").value;
                                let buzzValue = document.getElementById("buzzValue").value;
                            
                                //Ensure that the input is limited to numbers (parse). 
                                fizzValue = parseInt(fizzValue);
                                buzzValue = parseInt(buzzValue);
                            
                                //Ensure that the numbers are interpreted as integers.
                                if (Number.isInteger(fizzValue) && Number.isInteger(buzzValue)) {
                            
                                    //LOGIC FUNCTION
                                    //Call the fizzBuzz function and write the values to the screen
                                    let fbArray = fizzBuzz(fizzValue, buzzValue)
                                    displayData(fbArray);
                                } else {
                                    alert("You must use numbers")
                                }
                            }
                            
                            //Do FizzBuzz (aka call displayData and write the values to the table within the app)
                            
                            function fizzBuzz(fizzValue, buzzValue) {
                            
                                //Initialize the returnArray
                                let returnArray = [];
                            
                                //Write a loop from 1 to 100 and run 3 checks against the values within
                                for (let i = 1; i <= 100; i++) {
                            
                                    //Check 1: Divisible by BOTH 3 and 5? If so, push "FizzBuzz" into an array instead of a number
                                    if (i % fizzValue == 0 && i % buzzValue == 0) {
                                        returnArray.push('FizzBuzz');
                            
                                        //Check 2: Divisible by 3? If so, push "Fizz" into an array instead of a number
                                    } else if (i % fizzValue == 0) {
                                        returnArray.push('Fizz');
                            
                                        //Check 3: Divisible by 5? If so, push "Buzz" into an array instead of a number
                                    } else if (i % buzzValue == 0) {
                                        returnArray.push('Buzz');
                            
                                        //If none of the 3 checks above return a value of true, push a number into the array
                                    } else {
                                        returnArray.push(i);
                                    }
                                }
                                return returnArray;
                            }
                            
                            //VIEW FUNCTION
                            
                            //Loop over the array and create a table row for each item.
                            
                            function displayData(fbArray) {
                            
                                //Get the table body element from the HTML
                                let tableBody = document.getElementById("results");
                            
                                //Get the template row
                                let templateRow = document.getElementById("fbTemplate");
                            
                                //Clear table
                                tableBody.innerHTML = "";
                            
                                for (let i = 0; i < fbArray.length; i += 5) {
                            
                                    let tableRow = document.importNode(templateRow.content, true)
                            
                                    //Obtain data from table rows then put into an array
                                    let rowCols = tableRow.querySelectorAll("td");
                                    rowCols[0].textContent = fbArray[i];
                                    rowCols[1].textContent = fbArray[i + 1];
                                    rowCols[2].textContent = fbArray[i + 2];
                                    rowCols[3].textContent = fbArray[i + 3];
                                    rowCols[4].textContent = fbArray[i + 4];
                            
                                    tableBody.appendChild(tableRow);
                                }
                            
                                //Add all the rows to the table.
                            
                            }