diff --git a/src/babillard_page.eml.html b/src/babillard_page.eml.html
index accae1c..01c2d90 100644
--- a/src/babillard_page.eml.html
+++ b/src/babillard_page.eml.html
@@ -1,6 +1,6 @@
 let f request =
 <script type="text/javascript" src="/assets/js/js_babillard.js" defer="defer"></script>
-<div id="board" boardvalue="babillard">
+<div id="board" data-board="babillard">
 <%s  Format.sprintf "Babillard is love" %>
 </div>
 <div class="row mb-3">
diff --git a/src/js_babillard.ml b/src/js_babillard.ml
index 0a59e15..b9d4622 100644
--- a/src/js_babillard.ml
+++ b/src/js_babillard.ml
@@ -68,17 +68,17 @@ module Leaflet = struct
 end
 
 module Marker = struct
+  let board =
+    let board_div = Jv.get Jv.global "board" in
+    Jv.to_string
+      (Jv.call board_div "getAttribute" [| Jv.of_string "data-board" |])
+
   let marker_on_click thread_preview thread_id _e =
     log "marker_on_click@.";
     let thread_id = Jv.to_string thread_id in
     let thread_preview_div = Jv.get Jv.global "thread_preview_div" in
     ignore @@ Jv.set thread_preview_div "innerHTML" thread_preview;
     let thread_link = Jv.get Jv.global "thread_link" in
-    let board_div = Jv.get Jv.global "board" in
-    let board =
-      Jv.to_string
-        (Jv.call board_div "getAttribute" [| Jv.of_string "boardvalue" |])
-    in
     let link = Format.sprintf "/%s/%s" board thread_id in
     ignore @@ Jv.set thread_link "href" (Jv.of_string link);
     ignore @@ Jv.set thread_link "innerText" (Jv.of_string "[View Thread]");
@@ -112,11 +112,6 @@ module Marker = struct
 
   let () =
     log "fetch thread geojson@.";
-    let board_div = Jv.get Jv.global "board" in
-    let board =
-      Jv.to_string
-        (Jv.call board_div "getAttribute" [| Jv.of_string "boardvalue" |])
-    in
     let window = Jv.get Jv.global "window" in
     let link = Jv.of_string (Format.sprintf "/%s/markers" board) in
     let fetchfutur = Jv.call window "fetch" [| link |] in
diff --git a/src/plants_page.eml.html b/src/plants_page.eml.html
index 5902dd2..4e2fb22 100644
--- a/src/plants_page.eml.html
+++ b/src/plants_page.eml.html
@@ -1,6 +1,6 @@
 let f request =
 <script type="text/javascript" src="/assets/js/js_babillard.js" defer="defer"></script>
-<div id="board" boardvalue="plants">
+<div id="board" data-board="plants">
 <%s  Format.sprintf "Plants is love" %>
 </div>
 <div class="row mb-3">