diff --git a/src/pyj/read_book/flow_mode.pyj b/src/pyj/read_book/flow_mode.pyj
index 36d4431ee2..a54178ee5b 100644
--- a/src/pyj/read_book/flow_mode.pyj
+++ b/src/pyj/read_book/flow_mode.pyj
@@ -81,17 +81,18 @@ def scroll_by(y):
 
 def flow_onwheel(evt):
     dx = dy = 0
+    WheelEvent = window.WheelEvent
     if evt.deltaY:
-        if evt.deltaMode is evt.DOM_DELTA_PIXEL:
+        if evt.deltaMode is WheelEvent.DOM_DELTA_PIXEL:
             dy = evt.deltaY
-        elif evt.deltaMode is evt.DOM_DELTA_LINE:
+        elif evt.deltaMode is WheelEvent.DOM_DELTA_LINE:
             dy = 15 * evt.deltaY
-        if evt.deltaMode is evt.DOM_DELTA_PAGE:
+        if evt.deltaMode is WheelEvent.DOM_DELTA_PAGE:
             dy = (scroll_viewport.height() - 30) * evt.deltaY
     if evt.deltaX:
-        if evt.deltaMode is evt.DOM_DELTA_PIXEL:
+        if evt.deltaMode is WheelEvent.DOM_DELTA_PIXEL:
             dx = evt.deltaX
-        elif evt.deltaMode is evt.DOM_DELTA_LINE:
+        elif evt.deltaMode is WheelEvent.DOM_DELTA_LINE:
             dx = 15 * evt.deltaX
         else:
             dx = (scroll_viewport.width() - 30) * evt.deltaX
diff --git a/src/pyj/read_book/iframe.pyj b/src/pyj/read_book/iframe.pyj
index 7d3150462f..72d3593905 100644
--- a/src/pyj/read_book/iframe.pyj
+++ b/src/pyj/read_book/iframe.pyj
@@ -94,6 +94,7 @@ class IframeBoss:
             'change_font_size': self.change_font_size,
             'change_color_scheme': self.change_color_scheme,
             'gesture_from_margin': self.gesture_from_margin,
+            'wheel_from_margin': self.wheel_from_margin,
             'find': self.find,
             'window_size': self.received_window_size,
             'get_current_cfi': self.get_current_cfi,
@@ -198,6 +199,9 @@ class IframeBoss:
     def gesture_from_margin(self, data):
         self.handle_gesture(data.gesture)
 
+    def wheel_from_margin(self, data):
+        self.onwheel(data.evt)
+
     def report_human_scroll(self, scrolled_by_frac):
         self.send_message('human_scroll', scrolled_by_frac=scrolled_by_frac or None)
 
@@ -374,7 +378,8 @@ class IframeBoss:
 
     def onwheel(self, evt):
         if self.content_ready:
-            evt.preventDefault()
+            if evt.preventDefault:
+                evt.preventDefault()
             if evt.deltaY and evt.ctrlKey and not evt.shiftKey and not evt.altKey and not evt.metaKey:
                 self.send_message('handle_shortcut', name='increase_font_size' if evt.deltaY < 0 else 'decrease_font_size')
             else:
diff --git a/src/pyj/read_book/view.pyj b/src/pyj/read_book/view.pyj
index 9d310dbf14..cb0a7143c2 100644
--- a/src/pyj/read_book/view.pyj
+++ b/src/pyj/read_book/view.pyj
@@ -162,12 +162,12 @@ class View:
         left_margin = E.div(
             svgicon('caret-left'), style='width:{}px;'.format(sd.get('margin_left', 20)),
             class_='book-side-margin', id='book-left-margin', onclick=self.left_margin_clicked,
-            oncontextmenu=self.margin_context_menu.bind(None, 'left'))
+            oncontextmenu=self.margin_context_menu.bind(None, 'left'), onwheel=self.on_margin_wheel.bind(None, 'left'))
         set_left_margin_handler(left_margin)
         right_margin = E.div(
             svgicon('caret-right'), style='width:{}px;'.format(sd.get('margin_right', 20)),
             class_='book-side-margin', id='book-right-margin', onclick=self.right_margin_clicked,
-            oncontextmenu=self.margin_context_menu.bind(None, 'right'))
+            oncontextmenu=self.margin_context_menu.bind(None, 'right'), onwheel=self.on_margin_wheel.bind(None, 'right'))
         set_right_margin_handler(right_margin)
         iframe_id = unique_id('read-book-iframe')
         sandbox = 'allow-popups allow-scripts allow-popups-to-escape-sandbox'
@@ -279,6 +279,13 @@ class View:
         event.preventDefault(), event.stopPropagation()
         self.show_chrome()
 
+    def on_margin_wheel(self, which, event):
+        event.preventDefault()
+        evt = {}
+        for attr in ('deltaX', 'deltaY', 'deltaMode', 'altKey', 'ctrlKey', 'shiftKey', 'metaKey'):
+            evt[attr] = event[attr]
+        self.iframe_wrapper.send_message('wheel_from_margin', evt=evt)
+
     def forward_gesture(self, gesture):
         self.iframe_wrapper.send_message('gesture_from_margin', gesture=gesture)