diff --git a/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.cpp
index 9853f60e90c..838987857eb 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.cpp
@@ -34,6 +34,13 @@ RefPtr<HTMLOptionsCollection> const& HTMLSelectElement::options()
     return m_options;
 }
 
+// https://html.spec.whatwg.org/multipage/form-elements.html#dom-select-add
+DOM::ExceptionOr<void> HTMLSelectElement::add(HTMLOptionOrOptGroupElement element, Optional<HTMLElementOrElementIndex> before)
+{
+    // Similarly, the add(element, before) method must act like its namesake method on that same options collection.
+    return const_cast<RefPtr<HTMLOptionsCollection>&>(options())->add(move(element), move(before));
+}
+
 // https://html.spec.whatwg.org/multipage/form-elements.html#concept-select-option-list
 NonnullRefPtrVector<HTMLOptionElement> HTMLSelectElement::list_of_options() const
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.h b/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.h
index 1d0f3964dc1..c8ad0930a66 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.h
@@ -23,6 +23,8 @@ public:
 
     RefPtr<HTMLOptionsCollection> const& options();
 
+    DOM::ExceptionOr<void> add(HTMLOptionOrOptGroupElement element, Optional<HTMLElementOrElementIndex> before = {});
+
     int selected_index() const;
     void set_selected_index(int);
 
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.idl b/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.idl
index e473f31070a..3717993572c 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.idl
+++ b/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.idl
@@ -8,6 +8,8 @@ interface HTMLSelectElement : HTMLElement {
     [Reflect] attribute boolean required;
     [SameObject] readonly attribute HTMLOptionsCollection options;
 
+    [CEReactions] undefined add((HTMLOptionElement or HTMLOptGroupElement) element, optional (HTMLElement or long)? before = null);
+
     attribute long selectedIndex;
 
 };