diff --git a/packages/codemirror/html.mjs b/packages/codemirror/html.mjs
index 4b4d82e4..527275ef 100644
--- a/packages/codemirror/html.mjs
+++ b/packages/codemirror/html.mjs
@@ -1,6 +1,6 @@
-const parser = new DOMParser();
+const parser = typeof DOMParser !== 'undefined' ? new DOMParser() : null;
 export let html = (string) => {
-  return parser.parseFromString(string, 'text/html').querySelectorAll('*');
+  return parser?.parseFromString(string, 'text/html').querySelectorAll('*');
 };
 let parseChunk = (chunk) => {
   if (Array.isArray(chunk)) return chunk.flat().join('');
diff --git a/packages/codemirror/tooltip.mjs b/packages/codemirror/tooltip.mjs
index 7b7a36db..f67e6d14 100644
--- a/packages/codemirror/tooltip.mjs
+++ b/packages/codemirror/tooltip.mjs
@@ -6,26 +6,28 @@ const getDocLabel = (doc) => doc.name || doc.longname;
 
 let ctrlDown = false;
 
-// Record Control key event to trigger or block the tooltip depending on the state
-window.addEventListener(
-  'keyup',
-  function (e) {
-    if (e.key == 'Control') {
-      ctrlDown = false;
-    }
-  },
-  true,
-);
+if (typeof window !== 'undefined') {
+  // Record Control key event to trigger or block the tooltip depending on the state
+  window.addEventListener(
+    'keyup',
+    function (e) {
+      if (e.key == 'Control') {
+        ctrlDown = false;
+      }
+    },
+    true,
+  );
 
-window.addEventListener(
-  'keydown',
-  function (e) {
-    if (e.key == 'Control') {
-      ctrlDown = true;
-    }
-  },
-  true,
-);
+  window.addEventListener(
+    'keydown',
+    function (e) {
+      if (e.key == 'Control') {
+        ctrlDown = true;
+      }
+    },
+    true,
+  );
+}
 
 export const strudelTooltip = hoverTooltip(
   (view, pos, side) => {