Let's say your `.Site.Title` is "My Website". The code grabs `.Site.Title`, and then then checks to see if there's a `.Title`. When you're on the homepage, `.Title` is equivalent to `.Site.Title`, so that the browser bar will read:
> My Website | My Website
If we qualify `.Title` by confining to the `.Params` namespace, then the site title isn't duplicated:
```<title>{{ block "title" . }}{{ .Site.Title }} {{ with .Params.Title }} | {{ . }}{{ end }}{{ end }}</title>```
> My Website
But it still picks up `.Title` from posts and pages, where a content title exists in front matter:
> My Website | About Me
