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diff --git a/IDEAS.org b/IDEAS.org
index 4f2bd026..0864427f 100644
--- a/IDEAS.org
+++ b/IDEAS.org
@@ -34,6 +34,8 @@ See [[https://github.com/open-telemetry/opentelemetry-specification/blob/main/ex
 - Adapt web pages so you can browse them using cursor keys.
 - Use a "powerful" computer as a Smart TV with a simple remote
 
+Vivaldi's "spatial navigation" supposedly does this, but chokes on D+.
+
 * Terminal mail client
 
 - Easy set up of common mail accounts (perhaps using mbsync, notmuch, mu, etc.)