diff --git a/node_modules/@primer/behaviors/dist/esm/anchored-position.js b/node_modules/@primer/behaviors/dist/esm/anchored-position.js
index 3729dce..0f3cfc0 100644
--- a/node_modules/@primer/behaviors/dist/esm/anchored-position.js
+++ b/node_modules/@primer/behaviors/dist/esm/anchored-position.js
@@ -34,6 +34,9 @@ function getPositionedParent(element) {
 function getClippingRect(element) {
     let parentNode = element;
     while (parentNode !== null) {
+        if (parentNode === document) {
+            break
+        }
         if (parentNode === document.body) {
             break;
         }
@@ -43,7 +46,7 @@ function getClippingRect(element) {
         }
         parentNode = parentNode.parentNode;
     }
-    const clippingNode = parentNode === document.body || !(parentNode instanceof HTMLElement) ? document.body : parentNode;
+    const clippingNode = parentNode === document ? document.documentElement : parentNode === document.body || !(parentNode instanceof HTMLElement) ? document.body : parentNode;
     const elemRect = clippingNode.getBoundingClientRect();
     const elemStyle = getComputedStyle(clippingNode);
     const [borderTop, borderLeft, borderRight, borderBottom] = [