SQL Server Express and database Size

How large can a log file be in a SQL Server Express database?
It is said that the Database Limits are
SQL Server 2005 Express 4 GB
SQL Server 2008 Express 4 GB
SQL Server 2008 R2 Express 10 GB
SQL Server 2012 Express 10 GB
After doing a simple test on my SQL Server Express, I learned that the limitations is about the database MDF and NDF files. The database Logfile LDF seems in this case not included. I had a MDF file of 9GB (SQL Server 2008R2 Express) when I extended the log file to 4GB with no problem. Conclusion, SQL Server Express limitations only affect the size of the data files and Not the log files.