Why does this work once and never work again even if I refresh na page using chrome browser?

Question

I was using this page as test to check if the code works, and when I hit enter the code does work by checking all checkboxes and making all labels bold but when I refresh the page and try the same thing again it doesn't work anymore.

(function() {
    var aa = document.getElementsByTagName("input");
    var bb = document.getElementsByTagName("label");
    for (var i = 0; i < aa.length; i++){
        if (aa[i].type == 'checkbox')
            aa[i].checked = true;
            bb[i].textContent.bold();
    }
    
 })()

I tried using console.log(bb[i].textContent.bold() to check if the code detects the labels and it did the first time. The console says VM131:7 Uncaught TypeError: Cannot read properties of undefined (reading 'textContent'). I was expecting that the labels are also turned to bold after checking all the checkboxes

Answer 1

From OpenAI's ChatGPT:

It looks like there are several issues with the code you provided. First, the bold() method should be called on the style property of the label element, rather than on the textContent property. Second, the code is using the length property of the label element, which is not correct because the label element does not have a length property. Finally, the code is trying to bold the text of the label element, but it is not doing so correctly because it is not specifying the font-weight property of the style object.

Here is a revised version of the code that should work as expected:

(function() {
    var inputs = document.getElementsByTagName("input");
    var labels = document.getElementsByTagName("label");
    for (var i = 0; i < inputs.length; i++) {
        if (inputs[i].type === "checkbox") {
            inputs[i].checked = true;
            labels[i].style.fontWeight = "bold";
        }
    }
})();

This code will loop through all of the input elements on the page, check each checkbox input, and bold the corresponding label element. However, it should be noted that this code will only work once when the page is first loaded, because the getElementsByTagName() method returns a live HTMLCollection, which means that it will update automatically as elements are added or removed from the page. Therefore, if the page is refreshed or the elements on the page are updated in any way, the code will no longer have the desired effect.