diff --git a/src/widgets/ot_carousel.eliom b/src/widgets/ot_carousel.eliom
index 222972e6..44a65932 100644
--- a/src/widgets/ot_carousel.eliom
+++ b/src/widgets/ot_carousel.eliom
@@ -284,8 +284,9 @@ let%shared make ?(a = []) ?(vertical = false) ?(position = 0)
          (Js.Unsafe.coerce d2'##.style)##.webkitTransform := s;
          let move =
            not
-             (before == (Js.Unsafe.coerce d2'##.style)##.transform
-             || before == (Js.Unsafe.coerce d2'##.style)##.webkitTransform)
+             (Js.strict_equals before (Js.Unsafe.coerce d2'##.style)##.transform
+             || Js.strict_equals before
+                  (Js.Unsafe.coerce d2'##.style)##.webkitTransform)
          in
          let step = React.Step.create () in
          pos_set ~step pos;
diff --git a/src/widgets/ot_lib.eliom b/src/widgets/ot_lib.eliom
index 489903b0..69c8e2e0 100644
--- a/src/widgets/ot_lib.eliom
+++ b/src/widgets/ot_lib.eliom
@@ -78,8 +78,8 @@ let%client window_scrolls ?(ios_html_scroll_hack = false) ?use_capture handler =
     (fun () -> stop_thread (); Lwt.cancel !cur; Lwt.return_unit)
 
 let%client rec in_ancestors ~elt ~ancestor =
-  elt == (ancestor : Dom_html.element Js.t)
-  || (not (elt == Dom_html.document##.body))
+  Js.strict_equals elt (ancestor : Dom_html.element Js.t)
+  || (not (Js.strict_equals elt Dom_html.document##.body))
      && Js.Opt.case elt##.parentNode
           (fun () -> false)
           (fun parent ->
diff --git a/src/widgets/ot_nodeready.eliom b/src/widgets/ot_nodeready.eliom
index 15e55a5a..704dfc5c 100644
--- a/src/widgets/ot_nodeready.eliom
+++ b/src/widgets/ot_nodeready.eliom
@@ -25,7 +25,7 @@ open Js_of_ocaml
 let debug = false
 
 let rec node_in_document node =
-  node == (Dom_html.document :> Dom.node Js.t)
+  Js.strict_equals node (Dom_html.document :> Dom.node Js.t)
   || Js.Opt.case node##.parentNode (fun () -> false) node_in_document
 
 type t =
@@ -81,7 +81,9 @@ let nodeready n =
   else (
     if !watched = [] then observer##observe Dom_html.document config;
     try
-      let {thread} = List.find (fun {node} -> n == node) !watched in
+      let {thread} =
+        List.find (fun {node} -> Js.strict_equals n node) !watched
+      in
       log ~n "already being watched";
       thread
     with Not_found ->
@@ -93,7 +95,7 @@ let nodeready n =
       in
       Eliom_client.Page_status.ondead ~stop (fun () ->
         let instances_of_node, rest =
-          List.partition (fun {node} -> n == node) !watched
+          List.partition (fun {node} -> Js.strict_equals n node) !watched
         in
         watched := rest;
         instances_of_node