After the vscode or any extension update finished, a release note will show in vscode. I can find the releasenote in my computer, it is HTML file, I open it by vscode and vs
VS Code does not include built-in support for previewing html pages. This can be provided by an extension.
If you are interested in implementing this yourself, take a look at the webview api
However, as @herrbischoff noted, you should consider changing your workflow or expectations. A proper browser will offer a much better development experience and extensions like browser sync can connect VS Code to your browser of choice