If you run a Mastodon server, you can easily add a special bit of custom CSS to your server which causes image, video and audio posts without descriptions to have a red border. Here’s how to do it:

1. Log onto your server’s website with your admin account
2. Go to ⚙️ Preferences
3. Go to Administration
4. Go to Site Settings
5. Click the Appearance tab at the top
6. Copy the code from here ⧉ and paste it into the box marked Custom CSS
7. Click the Save Changes button

This will still allow users to post without descriptions, but the post will have a red border if there’s no alt text.

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