diff --git a/Tests/LibWeb/Text/expected/output-value.txt b/Tests/LibWeb/Text/expected/output-value.txt
new file mode 100644
index 0000000000..b782f874c9
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/output-value.txt
@@ -0,0 +1,2 @@
+1. "PASS"
+2. "PASS"
diff --git a/Tests/LibWeb/Text/input/output-value.html b/Tests/LibWeb/Text/input/output-value.html
new file mode 100644
index 0000000000..775149a022
--- /dev/null
+++ b/Tests/LibWeb/Text/input/output-value.html
@@ -0,0 +1,27 @@
+<script src="./include.js"></script>
+<script>
+    test(() => {
+        let testCounter = 1;
+        function testPart(part) {
+            println(`${testCounter++}. ${JSON.stringify(part())}`);
+        }
+
+        // 1. Set output element value
+        testPart(() => {
+            const output = document.createElement('output');
+            output.value = 'PASS';
+            return output.textContent;
+        });
+
+        // 2. Set output element default value and reset
+        testPart(() => {
+            const form = document.createElement('form');
+            const output = document.createElement('output');
+            output.defaultValue = 'PASS';
+            output.value = 'FAIL';
+            form.appendChild(output);
+            form.reset();
+            return output.textContent;
+        });
+    });
+</script>
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLOutputElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLOutputElement.cpp
index 44998f057a..b12bcf0ab8 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLOutputElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLOutputElement.cpp
@@ -24,12 +24,55 @@ void HTMLOutputElement::initialize(JS::Realm& realm)
     set_prototype(&Bindings::ensure_web_prototype<Bindings::HTMLOutputElementPrototype>(realm, "HTMLOutputElement"_fly_string));
 }
 
+// https://html.spec.whatwg.org/multipage/form-elements.html#dom-output-defaultvalue
+String HTMLOutputElement::default_value() const
+{
+    // 1. If this element's default value override is non-null, then return it.
+    if (m_default_value_override.has_value())
+        return *m_default_value_override;
+
+    // 2. Return this element's descendant text content.
+    return descendant_text_content();
+}
+
+// https://html.spec.whatwg.org/multipage/form-elements.html#dom-output-defaultvalue
+void HTMLOutputElement::set_default_value(String const& default_value)
+{
+    // 1. If this's default value override is null, then string replace all with the given value within this and return.
+    if (!m_default_value_override.has_value()) {
+        string_replace_all(default_value);
+        return;
+    }
+
+    // 2. Set this's default value override to the given value.
+    m_default_value_override = default_value;
+}
+
+// https://html.spec.whatwg.org/multipage/form-elements.html#dom-output-value
+String HTMLOutputElement::value() const
+{
+    // The value getter steps are to return this's descendant text content.
+    return descendant_text_content();
+}
+
+// https://html.spec.whatwg.org/multipage/form-elements.html#dom-output-value
+void HTMLOutputElement::set_value(String const& value)
+{
+    // 1. Set this's default value override to its default value.
+    m_default_value_override = default_value();
+
+    // 2. String replace all with the given value within this.
+    string_replace_all(value);
+}
+
 // https://html.spec.whatwg.org/multipage/form-elements.html#the-output-element:concept-form-reset-control
 void HTMLOutputElement::reset_algorithm()
 {
-    // 1. FIXME: String replace all with this element's default value within this element.
+    // 1. String replace all with this element's default value within this element.
+    string_replace_all(default_value());
 
-    // 2. FIXME: Set this element's default value override to null.
+    // 2. Set this element's default value override to null.
+    m_default_value_override = {};
 }
 
 }
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLOutputElement.h b/Userland/Libraries/LibWeb/HTML/HTMLOutputElement.h
index ba0bbefa70..8d046329f7 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLOutputElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLOutputElement.h
@@ -29,6 +29,12 @@ public:
         return output;
     }
 
+    String default_value() const;
+    void set_default_value(String const&);
+
+    String value() const override;
+    void set_value(String const&);
+
     // ^FormAssociatedElement
     // https://html.spec.whatwg.org/multipage/forms.html#category-listed
     virtual bool is_listed() const override { return true; }
@@ -52,6 +58,8 @@ private:
     HTMLOutputElement(DOM::Document&, DOM::QualifiedName);
 
     virtual void initialize(JS::Realm&) override;
+
+    Optional<String> m_default_value_override {};
 };
 
 }
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLOutputElement.idl b/Userland/Libraries/LibWeb/HTML/HTMLOutputElement.idl
index 35145e17c6..c01264c2d7 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLOutputElement.idl
+++ b/Userland/Libraries/LibWeb/HTML/HTMLOutputElement.idl
@@ -11,8 +11,8 @@ interface HTMLOutputElement : HTMLElement {
     [CEReactions, Reflect] attribute DOMString name;
 
     readonly attribute DOMString type;
-    // FIXME: [CEReactions] attribute DOMString defaultValue;
-    // FIXME: [CEReactions] attribute DOMString value;
+    [CEReactions] attribute DOMString defaultValue;
+    [CEReactions] attribute DOMString value;
 
     // FIXME: readonly attribute boolean willValidate;
     // FIXME: readonly attribute ValidityState validity;