diff --git a/Userland/Libraries/LibWeb/DOM/Element.cpp b/Userland/Libraries/LibWeb/DOM/Element.cpp
index e0d2706b30e..4362a7b008d 100644
--- a/Userland/Libraries/LibWeb/DOM/Element.cpp
+++ b/Userland/Libraries/LibWeb/DOM/Element.cpp
@@ -2130,6 +2130,18 @@ void Element::scroll(HTML::ScrollToOptions const&)
     dbgln("FIXME: Implement Element::scroll(ScrollToOptions)");
 }
 
+// https://drafts.csswg.org/cssom-view/#dom-window-scrollby
+void Element::scroll_by(double x, double y)
+{
+    dbgln("FIXME: Implement Element::scroll_by({}, {})", x, y);
+}
+
+// https://drafts.csswg.org/cssom-view/#dom-window-scrollby
+void Element::scroll_by(HTML::ScrollToOptions const&)
+{
+    dbgln("FIXME: Implement Element::scroll_by(ScrollToOptions)");
+}
+
 bool Element::id_reference_exists(String const& id_reference) const
 {
     return document().get_element_by_id(id_reference);
diff --git a/Userland/Libraries/LibWeb/DOM/Element.h b/Userland/Libraries/LibWeb/DOM/Element.h
index c027988a326..08dc3af09da 100644
--- a/Userland/Libraries/LibWeb/DOM/Element.h
+++ b/Userland/Libraries/LibWeb/DOM/Element.h
@@ -336,6 +336,8 @@ public:
 
     void scroll(HTML::ScrollToOptions const&);
     void scroll(double x, double y);
+    void scroll_by(HTML::ScrollToOptions const&);
+    void scroll_by(double x, double y);
 
     void register_intersection_observer(Badge<IntersectionObserver::IntersectionObserver>, IntersectionObserver::IntersectionObserverRegistration);
     void unregister_intersection_observer(Badge<IntersectionObserver::IntersectionObserver>, JS::NonnullGCPtr<IntersectionObserver::IntersectionObserver>);
diff --git a/Userland/Libraries/LibWeb/DOM/Element.idl b/Userland/Libraries/LibWeb/DOM/Element.idl
index ce00e6cb6e6..fe96e6ad14e 100644
--- a/Userland/Libraries/LibWeb/DOM/Element.idl
+++ b/Userland/Libraries/LibWeb/DOM/Element.idl
@@ -82,8 +82,8 @@ interface Element : Node {
     undefined scroll(unrestricted double x, unrestricted double y);
     [ImplementedAs=scroll] undefined scrollTo(optional ScrollToOptions options = {});
     [ImplementedAs=scroll] undefined scrollTo(unrestricted double x, unrestricted double y);
-    // FIXME: undefined scrollBy(optional ScrollToOptions options = {});
-    // FIXME: undefined scrollBy(unrestricted double x, unrestricted double y);
+    undefined scrollBy(optional ScrollToOptions options = {});
+    undefined scrollBy(unrestricted double x, unrestricted double y);
     attribute unrestricted double scrollTop;
     attribute unrestricted double scrollLeft;
     readonly attribute long scrollWidth;