diff --git a/Tests/LibWeb/Text/expected/select.txt b/Tests/LibWeb/Text/expected/select.txt
index 26f280fa42e..f10468bcba1 100644
--- a/Tests/LibWeb/Text/expected/select.txt
+++ b/Tests/LibWeb/Text/expected/select.txt
@@ -4,3 +4,6 @@
 4. 3
 5. "three"
 6. "Three"
+7. 45
+8. 0
+9. 0
diff --git a/Tests/LibWeb/Text/input/select.html b/Tests/LibWeb/Text/input/select.html
index 574e5c71a6d..f27c66298b3 100644
--- a/Tests/LibWeb/Text/input/select.html
+++ b/Tests/LibWeb/Text/input/select.html
@@ -74,5 +74,26 @@
             `;
             return select.value;
         });
+
+        // 7. Set select size property
+        testPart(() => {
+            const select = document.createElement('select');
+            select.size = '45';
+            return select.size;
+        });
+
+        // 8. Set select size property invalid
+        testPart(() => {
+            const select = document.createElement('select');
+            select.size = '12';
+            select.size = 'fadsfsd';
+            return select.size;
+        });
+
+        // 9. Get select size default
+        testPart(() => {
+            const select = document.createElement('select');
+            return select.size;
+        });
     });
 </script>
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.cpp
index 0f26de16f24..094a4e10ffe 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.cpp
@@ -18,6 +18,7 @@
 #include <LibWeb/HTML/HTMLOptGroupElement.h>
 #include <LibWeb/HTML/HTMLOptionElement.h>
 #include <LibWeb/HTML/HTMLSelectElement.h>
+#include <LibWeb/HTML/Numbers.h>
 #include <LibWeb/Infra/Strings.h>
 #include <LibWeb/Layout/Node.h>
 #include <LibWeb/Namespace.h>
@@ -67,6 +68,22 @@ void HTMLSelectElement::adjust_computed_style(CSS::StyleProperties& style)
         style.set_property(CSS::PropertyID::Display, CSS::DisplayStyleValue::create(CSS::Display::from_short(CSS::Display::Short::InlineBlock)));
 }
 
+// https://html.spec.whatwg.org/multipage/form-elements.html#dom-select-size
+WebIDL::UnsignedLong HTMLSelectElement::size() const
+{
+    // The size IDL attribute must reflect the respective content attributes of the same name. The size IDL attribute has a default value of 0.
+    if (auto size_string = get_attribute(HTML::AttributeNames::size); size_string.has_value()) {
+        if (auto size = parse_non_negative_integer(*size_string); size.has_value())
+            return *size;
+    }
+    return 0;
+}
+
+WebIDL::ExceptionOr<void> HTMLSelectElement::set_size(WebIDL::UnsignedLong size)
+{
+    return set_attribute(HTML::AttributeNames::size, MUST(String::number(size)));
+}
+
 // https://html.spec.whatwg.org/multipage/form-elements.html#dom-select-options
 JS::GCPtr<HTMLOptionsCollection> const& HTMLSelectElement::options()
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.h b/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.h
index a0387c79207..069f5fe6450 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.h
@@ -13,6 +13,7 @@
 #include <LibWeb/HTML/HTMLElement.h>
 #include <LibWeb/HTML/HTMLOptionsCollection.h>
 #include <LibWeb/HTML/SelectItem.h>
+#include <LibWeb/WebIDL/Types.h>
 
 namespace Web::HTML {
 
@@ -28,6 +29,9 @@ public:
 
     virtual void adjust_computed_style(CSS::StyleProperties&) override;
 
+    WebIDL::UnsignedLong size() const;
+    WebIDL::ExceptionOr<void> set_size(WebIDL::UnsignedLong);
+
     JS::GCPtr<HTMLOptionsCollection> const& options();
 
     size_t length();
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.idl b/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.idl
index e7b9c7c00da..893a90a1013 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.idl
+++ b/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.idl
@@ -13,7 +13,7 @@ interface HTMLSelectElement : HTMLElement {
     [CEReactions, Reflect] attribute boolean multiple;
     [CEReactions, Reflect] attribute DOMString name;
     [CEReactions, Reflect] attribute boolean required;
-    // FIXME: [CEReactions] attribute unsigned long size;
+    [CEReactions] attribute unsigned long size;
 
     readonly attribute DOMString type;