backport some node_lexbor modifications

Signed-off-by: Francis Bouvier <francis.bouvier@gmail.com>

src/dom/node.zig

@@ -1,11 +1,23 @@
 const std = @import("std");
 
+const generate = @import("../generate.zig");
+
 const parser = @import("../netsurf.zig");
 
 const EventTarget = @import("event_target.zig").EventTarget;
+const HTMLDocument = @import("../html/document.zig").HTMLDocument;
+const HTMLElem = @import("../html/elements.zig");
 
 pub const Node = struct {
     pub const Self = parser.Node;
     pub const prototype = *EventTarget;
     pub const mem_guarantied = true;
 };
+
+pub const Types = generate.Tuple(.{
+    HTMLElem.Types,
+    HTMLDocument,
+});
+const Generated = generate.Union.compile(Types);
+pub const Union = Generated._union;
+pub const Tags = Generated._enum;