diff --git a/web/src/engine/osk/src/input/gestures/browser/tabletPreview.ts b/web/src/engine/osk/src/input/gestures/browser/tabletPreview.ts
index c8f4d7dd92..1da5dd49c5 100644
--- a/web/src/engine/osk/src/input/gestures/browser/tabletPreview.ts
+++ b/web/src/engine/osk/src/input/gestures/browser/tabletPreview.ts
@@ -54,7 +54,10 @@ export class TabletKeyTip implements KeyTipInterface {
     // decent null-guard check.
     if(on && key?.offsetParent) {
       // May need adjustment for borders if ever enabled for the desktop form-factor target.
-      const hostRect = this.vkbd.element.getBoundingClientRect();
+
+      // Note:  this.vkbd does not set relative or absolute positioning.  Nearest positioned
+      // ancestor = the OSKView's _Box, accessible as this.vkbd.topContainer.
+      const hostRect = this.vkbd.topContainer.getBoundingClientRect();
       const keyRect = key.getBoundingClientRect();
 
       // Used to apply box-shadow overlay styling when the preview is for a key on a layer not
diff --git a/web/src/test/manual/web/prediction-mtnt/index.html b/web/src/test/manual/web/prediction-mtnt/index.html
index 3613fe72aa..6935f99efa 100644
--- a/web/src/test/manual/web/prediction-mtnt/index.html
+++ b/web/src/test/manual/web/prediction-mtnt/index.html
@@ -44,7 +44,9 @@
         kmw.addKeyboards({id:'lao_2008_basic',name:'Lao',languages:{id:'lo',name:'Lao'}, filename:'../lao_2008_basic-1.2.js'});
         kmw.addKeyboards('sil_euro_latin@en');
         kmw.addKeyboards({id:'ye_old_ten_key',name:'Classic 10-key',languages:{id:'en',name:'English'},
-          filename:('../keyboards/ye_old_ten_key/build/ye_old_ten_key.js')})
+          filename:('../keyboards/ye_old_ten_key/build/ye_old_ten_key.js')});
+        kmw.addKeyboards({id:'gesture_prototyping',name:'Gesture prototyping',languages:{id:'en',name:'English'},
+          filename:('../keyboards/gesture_prototyping/build/gesture_prototyping.js')})
 
         var pageRef = (window.location.protocol == 'file:')
           ? window.location.href.substr(0, window.location.href.lastIndexOf('/')+1)