diff --git a/src/dom/document.zig b/src/dom/document.zig
index 80deaf36..8119f357 100644
--- a/src/dom/document.zig
+++ b/src/dom/document.zig
@@ -34,6 +34,12 @@ pub const Document = struct {
         return Element.toInterface(e);
     }
 
+    // TODO implement contentType
+    pub fn get_contentType(self: *parser.Document) []const u8 {
+        _ = self;
+        return "text/html";
+    }
+
     // TODO implement compactMode
     pub fn get_compatMode(self: *parser.Document) []const u8 {
         _ = self;
@@ -157,6 +163,11 @@ pub fn testExecFn(
     };
     try checkCases(js_env, &getCompatMode);
 
+    var getContentType = [_]Case{
+        .{ .src = "document.contentType", .ex = "text/html" },
+    };
+    try checkCases(js_env, &getContentType);
+
     const tags = comptime parser.Tag.all();
     comptime var createElements: [(tags.len) * 2]Case = undefined;
     inline for (tags, 0..) |tag, i| {