diff --git a/sphinx_togglebutton/_static/togglebutton.js b/sphinx_togglebutton/_static/togglebutton.js
index 4b822bb..3c5fc8f 100644
--- a/sphinx_togglebutton/_static/togglebutton.js
+++ b/sphinx_togglebutton/_static/togglebutton.js
@@ -8,9 +8,15 @@ let toggleChevron = `
 <polyline points="9 6 15 12 9 18" />
 </svg>`;
 
+var togglebuttonLog = (...args) => {
+  if (typeof togglebuttonDebug !== "undefined" && togglebuttonDebug) {
+    console.log(...args);
+  }
+};
+
 var initToggleItems = () => {
   var itemsToToggle = document.querySelectorAll(togglebuttonSelector);
-  console.log(
+  togglebuttonLog(
     `[togglebutton]: Adding toggle buttons to ${itemsToToggle.length} items`
   );
   // Add the button to each admonition and hook up a callback to toggle visibility
@@ -163,7 +169,7 @@ var toggleClickHandler = (click) => {
     // We've clicked the button itself and so don't need to do anything
     button = click.target;
   } else {
-    console.log(`[togglebutton]: Couldn't find button for ${click.target}`);
+    togglebuttonLog(`[togglebutton]: Couldn't find button for ${click.target}`);
   }
   target = document.getElementById(button.dataset["button"]);
   toggleHidden(target);
@@ -234,7 +240,7 @@ if (toggleOpenOnPrint == "true") {
     document
       .querySelectorAll(".admonition.toggle.toggle-hidden")
       .forEach((el) => {
-        console.log(el);
+        togglebuttonLog(el);
         el.querySelector("button.toggle-button").click();
         el.dataset["toggle_after_print"] = "true";
       });
diff --git a/tests/test_togglebutton_console.js b/tests/test_togglebutton_console.js
new file mode 100644
index 0000000..03d89ca
--- /dev/null
+++ b/tests/test_togglebutton_console.js
@@ -0,0 +1,66 @@
+/**
+ * Regression for executablebooks/sphinx-togglebutton#56:
+ * initToggleItems must not write to the console unless a debug flag is on.
+ */
+const { test } = require("node:test");
+const assert = require("node:assert/strict");
+const fs = require("fs");
+const path = require("path");
+const vm = require("vm");
+
+const JS_PATH = path.join(
+  __dirname,
+  "..",
+  "sphinx_togglebutton",
+  "_static",
+  "togglebutton.js"
+);
+
+function loadTogglebutton({ togglebuttonDebug } = {}) {
+  const logs = [];
+  const sandbox = {
+    console: {
+      log: (...args) => {
+        logs.push(args);
+      },
+    },
+    document: {
+      // Stay in "loading" so DOMContentLoaded hooks are not flushed on import.
+      readyState: "loading",
+      querySelectorAll: () => [],
+      addEventListener: () => {},
+      getElementById: () => null,
+    },
+    window: {
+      addEventListener: () => {},
+    },
+    CSS: { escape: (s) => s },
+    togglebuttonSelector: ".toggle",
+    toggleHintShow: "Click to show",
+    toggleHintHide: "Click to hide",
+    toggleOpenOnPrint: "false",
+  };
+  if (togglebuttonDebug !== undefined) {
+    sandbox.togglebuttonDebug = togglebuttonDebug;
+  }
+  vm.createContext(sandbox);
+  vm.runInContext(fs.readFileSync(JS_PATH, "utf8"), sandbox);
+  return { sandbox, logs };
+}
+
+test("initToggleItems does not log to the console by default", () => {
+  const { sandbox, logs } = loadTogglebutton();
+  sandbox.initToggleItems();
+  assert.equal(
+    logs.length,
+    0,
+    `unconditional console.log: ${JSON.stringify(logs)}`
+  );
+});
+
+test("initToggleItems logs when togglebuttonDebug is enabled", () => {
+  const { sandbox, logs } = loadTogglebutton({ togglebuttonDebug: true });
+  sandbox.initToggleItems();
+  assert.equal(logs.length, 1);
+  assert.match(String(logs[0]), /\[togglebutton\]: Adding toggle buttons to 0 items/);
+});