//get the value from the Page
                      function getValues() {
                        // get values from the page
                        let startValue = document.getElementById("startValue").value;
                        let endValue = document.getElementById("endValue").value;
                      
                        startValue = parseInt(startValue);
                        endValue = parseInt(endValue);
                      
                        if (Number.isInteger(startValue) && Number.isInteger(endValue)) {
                          // call generateNumbers
                          let numbers = generateNumbers(startValue, endValue);
                          // call displayNumbers
                          displayNumbers(numbers);
                        } else {
                          alert("You must enter an integer");
                        }
                      }
                      
                      //generate numbers from startvalue to the endvalue
                      function generateNumbers(startValue, endValue) {
                        let numbers = [];
                      
                        // get all numbers from start to endValue
                        for (let i = startValue; i <= endValue; i++) {
                          // execute until i = endValue
                          numbers.push(i);
                        }
                      
                        return numbers;
                      }
                      
                      // display the numbers and mark even numbers bold
                      function displayNumbers(numbers) {
                        let templateRows = "";
                      
                        for (let i = 0; i < numbers.length; i++) {
                          let className = "even";
                          let number = numbers[i];
                      
                          if(number % 2 == 0){
                            className = "even";
                          }else{
                            className = "odd";
                          }
                          // Prism.js does not support html and template literals. Please see source code.
                          templateRows += `<tr><td class="${className}" >${number}</td></tr>`;
                        }
                      
                        document.getElementById("results").innerHTML = templateRows;
                      }
                    
                

The code is structured as multiple functions

All The Way Up

All The Way Up is a set of functions to loop through the start and end numbers and return the results into a table that dispalys the even numbers in bold.