LibWeb: Add spec comments and links to XHR members

Userland/Libraries/LibWeb/XHR/XMLHttpRequest.h

@@ -83,34 +83,92 @@ private:
 
     explicit XMLHttpRequest(HTML::Window&);
 
+    // Non-standard
     JS::NonnullGCPtr<HTML::Window> m_window;
-
-    State m_state { State::Unsent };
     Fetch::Infrastructure::Status m_status { 0 };
-    bool m_send { false };
-    u32 m_timeout { 0 };
-
-    String m_method;
-    AK::URL m_url;
-
-    Bindings::XMLHttpRequestResponseType m_response_type;
-
-    HashMap<String, String, CaseInsensitiveStringTraits> m_request_headers;
     HashMap<String, String, CaseInsensitiveStringTraits> m_response_headers;
 
+    // https://xhr.spec.whatwg.org/#concept-xmlhttprequest-state
+    // state
+    //     One of unsent, opened, headers received, loading, and done; initially unsent.
+    State m_state { State::Unsent };
+
+    // https://xhr.spec.whatwg.org/#send-flag
+    // send() flag
+    //     A flag, initially unset.
+    bool m_send { false };
+
+    // https://xhr.spec.whatwg.org/#timeout
+    // timeout
+    //     An unsigned integer, initially 0.
+    u32 m_timeout { 0 };
+
+    // FIXME: https://xhr.spec.whatwg.org/#cross-origin-credentials
+
+    // https://xhr.spec.whatwg.org/#request-method
+    // request method
+    //     A method.
+    String m_method;
+
+    // https://xhr.spec.whatwg.org/#request-url
+    // request URL
+    //     A URL.
+    AK::URL m_url;
+
+    // https://xhr.spec.whatwg.org/#author-request-headers
+    // author request headers
+    //     A header list, initially empty.
+    HashMap<String, String, CaseInsensitiveStringTraits> m_request_headers;
+
+    // FIXME: https://xhr.spec.whatwg.org/#request-body
+
+    // https://xhr.spec.whatwg.org/#synchronous-flag
+    // synchronous flag
+    //     A flag, initially unset.
     bool m_synchronous { false };
+
+    // https://xhr.spec.whatwg.org/#upload-complete-flag
+    // upload complete flag
+    //     A flag, initially unset.
     bool m_upload_complete { false };
+
+    // https://xhr.spec.whatwg.org/#upload-listener-flag
+    // upload listener flag
+    //     A flag, initially unset.
     bool m_upload_listener { false };
+
+    // https://xhr.spec.whatwg.org/#timed-out-flag
+    // timed out flag
+    //     A flag, initially unset.
     bool m_timed_out { false };
 
+    // FIXME: https://xhr.spec.whatwg.org/#response
+
+    // https://xhr.spec.whatwg.org/#received-bytes
+    // received bytes
+    //     A byte sequence, initially the empty byte sequence.
     ByteBuffer m_received_bytes;
 
+    // https://xhr.spec.whatwg.org/#response-type
+    // response type
+    //     One of the empty string, "arraybuffer", "blob", "document", "json", and "text"; initially the empty string.
+    Bindings::XMLHttpRequestResponseType m_response_type;
+
     enum class Failure {
         /// ????
     };
+
+    // https://xhr.spec.whatwg.org/#response-object
+    // response object
+    //     An object, failure, or null, initially null.
     Variant<JS::Value, Failure, Empty> m_response_object;
 
+    // FIXME: https://xhr.spec.whatwg.org/#xmlhttprequest-fetch-controller
+
     // https://xhr.spec.whatwg.org/#override-mime-type
+    // override MIME type
+    //     A MIME type or null, initially null.
+    //     NOTE: Can get a value when overrideMimeType() is invoked.
     Optional<MimeSniff::MimeType> m_override_mime_type;
 };