diff --git a/examples/specs/bar_conditional_opacity.vl.json b/examples/specs/bar_conditional_opacity.vl.json
new file mode 100644
index 0000000000..10c16b64cd
--- /dev/null
+++ b/examples/specs/bar_conditional_opacity.vl.json
@@ -0,0 +1,140 @@
+{
+  "width": 400,
+  "height": 400,
+  "layer": [
+      {
+          "mark": {
+              "type": "bar"
+          },
+          "encoding": {
+              "x": {
+                  "field": "C2",
+                  "type": "nominal"
+              },
+              "y": {
+                  "field": "Q1_Null",
+                  "type": "quantitative"
+              },
+              "tooltip": [
+                  {
+                      "field": "C2",
+                      "type": "nominal",
+                      "title": "C2"
+                  },
+                  {
+                      "field": "Q1_Null",
+                      "type": "quantitative",
+                      "title": "Q1_Null"
+                  }
+              ],
+              "opacity": {
+                  "condition": [
+                      {
+                          "test": "selection.kind === 'values' && indexof(selection.values, datum['C2']) === -1",
+                          "value": 0.2
+                      }
+                  ]
+              }
+          }
+      }
+  ],
+  "data": {
+      "values": [
+          {
+              "Q1": 12.3,
+              "Q2": 63.5,
+              "Q1_Null": null,
+              "Q2_Null": 63.5,
+              "C1": "A",
+              "C1_Null": null,
+              "C2": "a1",
+              "C2_Null": "a1",
+              "T": "2022-09-07T00:00:00.000Z",
+              "T_Null": "2022-09-07T00:00:00.000Z"
+          },
+          {
+              "Q1": 62.3,
+              "Q2": 34.5,
+              "Q1_Null": null,
+              "Q2_Null": 34.5,
+              "C1": "A",
+              "C1_Null": "A",
+              "C2": "b1",
+              "C2_Null": "b1",
+              "T": "2022-09-08T00:00:00.000Z",
+              "T_Null": null
+          },
+          {
+              "Q1": 82.3,
+              "Q2": 77.7,
+              "Q1_Null": 82.3,
+              "C1": "A",
+              "C1_Null": "A",
+              "C2": "c1",
+              "C2_Null": "c1",
+              "T": "2022-09-09T00:00:00.000Z",
+              "T_Null": "2022-09-09T00:00:00.000Z"
+          },
+          {
+              "Q1": 41.1,
+              "Q2": 29.1,
+              "Q1_Null": 41.1,
+              "Q2_Null": null,
+              "C1": "B",
+              "C1_Null": "B",
+              "C2": "a2",
+              "C2_Null": "a2",
+              "T": "2022-09-17T00:00:00.000Z",
+              "T_Null": "2022-09-17T00:00:00.000Z"
+          },
+          {
+              "Q1": 31.1,
+              "Q2": 39.1,
+              "Q1_Null": 31.1,
+              "Q2_Null": null,
+              "C1": "A",
+              "C1_Null": "A",
+              "C2": "a2",
+              "C2_Null": "a2",
+              "T": "2022-09-07T00:00:00.000Z",
+              "T_Null": "2022-09-07T00:00:00.000Z"
+          },
+          {
+              "Q1": 15.1,
+              "Q2": 50.1,
+              "Q1_Null": 15.1,
+              "Q2_Null": 50.1,
+              "C1": "B",
+              "C1_Null": null,
+              "C2": "c2",
+              "C2_Null": null,
+              "T": "2022-09-18T00:00:00.000Z",
+              "T_Null": "2022-09-18T00:00:00.000Z"
+          },
+          {
+              "Q1": 48.1,
+              "Q2": 94.1,
+              "Q1_Null": 48.1,
+              "Q2_Null": 94.1,
+              "C1": "B",
+              "C1_Null": "B",
+              "C2": "c3",
+              "C2_Null": "c3",
+              "T": "2022-09-19T00:00:00.000Z",
+              "T_Null": "2022-09-19T00:00:00.000Z"
+          },
+          {
+              "Q1": 48.1,
+              "Q2": 94.1,
+              "Q1_Null": null,
+              "Q2_Null": null,
+              "C1": "B",
+              "C1_Null": "B",
+              "C2": "c4",
+              "C2_Null": "c4",
+              "T": "2022-09-20T00:00:00.000Z",
+              "T_Null": "2022-09-30T00:00:00.000Z"
+          }
+      ]
+  }
+}