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The optional integrated web browser view (in CSS HTML Validator 2022/v22+) requires the Microsoft Edge WebView2 / WebView Runtime in order to work. This is normally included as part of the Windows 11 operating system but if you're using Windows 10 then you may need to download and install the WebView2 Runtime (if it isn't already installed).
Please download the Microsoft WebView2 Runtime installer and then run it. The installer will then download and install the appropriate files for the WebView2 Runtime for your operating system.
After installation, please restart CSS HTML Validator and then try using an integrated browser view. If it still doesn't work then please contact us for support.
PRIVACY: The WebView2 software is provided by Microsoft and it may collect information about the end user's use of the software, and send that information to Microsoft to provide services as disclosed in Microsoft's Privacy Statement at https://aka.ms/privacy.
UPDATES: The WebView2 software may periodically check for updates, and download and install them for you. Microsoft may need to update your systems to provide you with updates. You agree to receive these automatic updates without any additional notice. Updates may not include or support all existing software features, services, or peripheral devices.