diff --git a/Userland/Libraries/LibWeb/HTML/AttributeNames.h b/Userland/Libraries/LibWeb/HTML/AttributeNames.h
index d0f4fba2dc..942df21e16 100644
--- a/Userland/Libraries/LibWeb/HTML/AttributeNames.h
+++ b/Userland/Libraries/LibWeb/HTML/AttributeNames.h
@@ -225,6 +225,7 @@ namespace AttributeNames {
     __ENUMERATE_HTML_ATTRIBUTE(rules)                      \
     __ENUMERATE_HTML_ATTRIBUTE(scheme)                     \
     __ENUMERATE_HTML_ATTRIBUTE(scrollamount)               \
+    __ENUMERATE_HTML_ATTRIBUTE(scrolldelay)                \
     __ENUMERATE_HTML_ATTRIBUTE(scrolling)                  \
     __ENUMERATE_HTML_ATTRIBUTE(selected)                   \
     __ENUMERATE_HTML_ATTRIBUTE(shadowrootclonable)         \
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLMarqueeElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLMarqueeElement.cpp
index 45aff94189..0ae41d657f 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLMarqueeElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLMarqueeElement.cpp
@@ -60,4 +60,21 @@ WebIDL::ExceptionOr<void> HTMLMarqueeElement::set_scroll_amount(WebIDL::Unsigned
     return set_attribute(HTML::AttributeNames::scrollamount, MUST(String::number(value)));
 }
 
+// https://html.spec.whatwg.org/multipage/obsolete.html#dom-marquee-scrolldelay
+WebIDL::UnsignedLong HTMLMarqueeElement::scroll_delay()
+{
+    // The scrollDelay IDL attribute must reflect the scrolldelay content attribute. The default value is 85.
+    if (auto scroll_delay_string = get_attribute(HTML::AttributeNames::scrolldelay); scroll_delay_string.has_value()) {
+        if (auto scroll_delay = parse_non_negative_integer(*scroll_delay_string); scroll_delay.has_value())
+            return *scroll_delay;
+    }
+    return 85;
+}
+
+// https://html.spec.whatwg.org/multipage/obsolete.html#dom-marquee-scrolldelay
+WebIDL::ExceptionOr<void> HTMLMarqueeElement::set_scroll_delay(WebIDL::UnsignedLong value)
+{
+    return set_attribute(HTML::AttributeNames::scrolldelay, MUST(String::number(value)));
+}
+
 }
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLMarqueeElement.h b/Userland/Libraries/LibWeb/HTML/HTMLMarqueeElement.h
index 79e83e8745..63e3352ee0 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLMarqueeElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLMarqueeElement.h
@@ -23,6 +23,9 @@ public:
     WebIDL::UnsignedLong scroll_amount();
     WebIDL::ExceptionOr<void> set_scroll_amount(WebIDL::UnsignedLong);
 
+    WebIDL::UnsignedLong scroll_delay();
+    WebIDL::ExceptionOr<void> set_scroll_delay(WebIDL::UnsignedLong);
+
 private:
     HTMLMarqueeElement(DOM::Document&, DOM::QualifiedName);
 
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLMarqueeElement.idl b/Userland/Libraries/LibWeb/HTML/HTMLMarqueeElement.idl
index 96bcaf51dd..1403158097 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLMarqueeElement.idl
+++ b/Userland/Libraries/LibWeb/HTML/HTMLMarqueeElement.idl
@@ -13,7 +13,7 @@ interface HTMLMarqueeElement : HTMLElement {
     [CEReactions, Reflect] attribute unsigned long hspace;
     [FIXME, CEReactions] attribute long loop;
     [CEReactions] attribute unsigned long scrollAmount;
-    [FIXME, CEReactions] attribute unsigned long scrollDelay;
+    [CEReactions] attribute unsigned long scrollDelay;
     [FIXME, CEReactions] attribute boolean trueSpeed;
     [CEReactions, Reflect] attribute unsigned long vspace;
     [CEReactions, Reflect] attribute DOMString width;