Hi there! I see you're having trouble with Merge Mansion getting stuck at 99% loading on your Windows device using WebKit. Let's get this sorted out together.

To start, could you tell me if you've tried refreshing the browser or clearing your browser cache and cookies? Sometimes residual data can cause the loading to freeze. If you haven't, here’s how you can do it on your browser:

1. Close all browser windows.
2. Open your browser settings.
3. Look for Privacy or History settings and find the option to clear browsing data.
4. Select cookies and cached images/files.
5. Clear the data and then restart your browser.
6. Go back to Merge Mansion and try loading the game again.

If that doesn’t help, the issue might be network-related, so check if your internet connection is stable and strong. Switching between WiFi and wired connection or even restarting your router can be beneficial.

Also, since you’re on Windows, make sure your browser is up to date to make sure it supports all game functionalities smoothly.

If these steps don’t resolve the issue, please let me know if you’ve seen this behavior after a recent update or if it started out of the blue. That info can help me guide you better.

I came across a few others with similar loading stuck problems at 98 or 99%, and clearing cache or checking network stability often helped them1 2.

Let me know how it goes or if you've tried any of these already!