Web compatible means the node is run in such a way that it allows web clients to access their APIs (CORS headers allow all and secure HTTP / TLS terminated).
The more nodes there are running with these settings the more robust web clients will be in the future.

Tracking 6 mainnet Monero nodes in the database.
Of those, 0 nodes failed their last check-in (unresponsive to ping or over 100 blocks away from highest reported block).

Showing 6 nodes. Show Active

URL	Height	Available	Web Compatible	Network	Date Added	Last Checked	History
https://community.organic-meatballs.duckdns.org:443	2769339			mainnet	7 months ago	2 hours ago
https://fallacy.fiatfaucet.com:18089	2769339			mainnet	5 months ago	2 hours ago
https://kowalski.fiatfaucet.com	2769339			mainnet	5 months ago	2 hours ago
https://dewitte.fiatfaucet.com	2769339			mainnet	5 months ago	2 hours ago
https://node-xmr.encryp.ch:18089	2769339			mainnet	2 weeks ago	2 hours ago
https://bunkernet.ddns.net:18089	2769339			mainnet	6 months ago	2 hours ago