diff --git a/IPython/core/pylabtools.py b/IPython/core/pylabtools.py
index 68e100f..7c45218 100644
--- a/IPython/core/pylabtools.py
+++ b/IPython/core/pylabtools.py
@@ -26,6 +26,7 @@ backends = {
     "qt": "Qt5Agg",
     "osx": "MacOSX",
     "nbagg": "nbAgg",
+    "webagg": "WebAgg",
     "notebook": "nbAgg",
     "agg": "agg",
     "svg": "svg",