What is the reason behind the delayed reflection of changes made to a referenced element within a class instance object in the Firefox code inspector?

After spending a considerable amount of time trying to debug what I believed to be unusual behavior in Firefox, it dawned on me that it might just be an issue with rendering timing or perhaps my own lack of familiarity with code inspection. Here is a simplified example of the code in question:

class Folder
{
   constructor (tabCount)
   {
      this.tabs = [];
      for (let i = 0; i < tabCount; i += 1)
      {
         const me = document.createElement('DIV');
         this.tabs[i] = me;
         this.tabs[i].className = "tab";
         document.body.appendChild(this.tabs[i]);
      }

      selectTab(index)
      {
         this.tabs[index].classList.add('selected');
      }
   }
}
var mainFolder = new Folder(5);
mainFolder.selectTab(0);

//with CSS to give .tab red color and .tab.selected a blue color.

During debugging, when I set a Debugger break point at selectTab(), everything seems to work as expected when I step through the code. However, I notice that while the class changes are applied correctly visually, they do not reflect immediately in the HTML Inspector tab. This makes it difficult to identify where exactly certain CSS classes are being incorrectly assigned in my real code. Is there a way to refresh or update the HTML content while paused in debug mode?

Any insights would be greatly appreciated. Thank you.

Answer №1

Initially, I was doubtful about the issue's description. However, after testing Firefox version 91 myself, I can confirm that the Inspector tab in the devtools does not seem to update as you step through the code.

Unfortunately, there may not be much that can be done within Firefox to address this. It might be worth considering using a different browser for debugging purposes if this proves to be problematic. For example, Chromium's devtools update dynamically as you navigate through the code, and I believe Microsoft Edge's would do the same (especially if you are on Windows).

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