Archives

The site will be unavailable on some devices after January 11, 2021.

Let’s Encrypt, the Certification Authority that issues the SSL certificates I use, has decided to make some changes to their certificates on January 11, 2021.
After January 11, 2021, some devices will not be able to view this site.

The following devices will not be able to view this site.
1. Those without Android 7.1.1 or later
2. the environment on which macOS Sierra or later is not installed
If you have any of the above, you can still view the site as it is if you are using Mozilla Firefox.