the user exits the browser.
If the environment variable :envvar:`BROWSER` exists, it is interpreted as the
-:data:`os.pathsep`-separated list of browsers to try ahead of the the platform
+:data:`os.pathsep`-separated list of browsers to try ahead of the platform
defaults. When the value of a list part contains the string ``%s``, then it is
interpreted as a literal browser command line to be used with the argument URL
substituted for ``%s``; if the part does not contain ``%s``, it is simply