diff --git a/Userland/Libraries/LibWeb/HTML/HTMLMetaElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLMetaElement.cpp
index 1ac1f52b09b..10219129fa4 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLMetaElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLMetaElement.cpp
@@ -90,6 +90,11 @@ void HTMLMetaElement::inserted()
     auto http_equiv = http_equiv_state();
     if (http_equiv.has_value()) {
         switch (http_equiv.value()) {
+        case HttpEquivAttributeState::EncodingDeclaration:
+            // https://html.spec.whatwg.org/multipage/semantics.html#attr-meta-http-equiv-content-type
+            // The Encoding declaration state is just an alternative form of setting the charset attribute: it is a character encoding declaration.
+            // This state's user agent requirements are all handled by the parsing section of the specification.
+            break;
         case HttpEquivAttributeState::Refresh: {
             // https://html.spec.whatwg.org/multipage/semantics.html#attr-meta-http-equiv-refresh
             // 1. If the meta element has no content attribute, or if that attribute's value is the empty string, then return.
@@ -105,6 +110,17 @@ void HTMLMetaElement::inserted()
             document().shared_declarative_refresh_steps(input, this);
             break;
         }
+        case HttpEquivAttributeState::SetCookie:
+            // https://html.spec.whatwg.org/multipage/semantics.html#attr-meta-http-equiv-set-cookie
+            // This pragma is non-conforming and has no effect.
+            // User agents are required to ignore this pragma.
+            break;
+        case HttpEquivAttributeState::XUACompatible:
+            // https://html.spec.whatwg.org/multipage/semantics.html#attr-meta-http-equiv-x-ua-compatible
+            // In practice, this pragma encourages Internet Explorer to more closely follow the specifications.
+            // For meta elements with an http-equiv attribute in the X-UA-Compatible state, the content attribute must have a value that is an ASCII case-insensitive match for the string "IE=edge".
+            // User agents are required to ignore this pragma.
+            break;
         default:
             dbgln("FIXME: Implement '{}' http-equiv state", get_attribute_value(AttributeNames::http_equiv));
             break;