diff --git a/src/dom/document.zig b/src/dom/document.zig
index 80a90593..cb07715c 100644
--- a/src/dom/document.zig
+++ b/src/dom/document.zig
@@ -22,8 +22,8 @@ pub const Document = struct {
     pub const prototype = *Node;
     pub const mem_guarantied = true;
 
-    pub fn constructor() *parser.Document {
-        return parser.domImplementationCreateHTMLDocument(null);
+    pub fn constructor() !*parser.Document {
+        return try parser.domImplementationCreateHTMLDocument(null);
     }
 
     // JS funcs
diff --git a/src/dom/exceptions.zig b/src/dom/exceptions.zig
index 32792d86..48650489 100644
--- a/src/dom/exceptions.zig
+++ b/src/dom/exceptions.zig
@@ -54,7 +54,11 @@ pub const DOMException = struct {
                 .{ errName, callerName },
             ),
             error.NoError => unreachable,
-            else => "", // TODO: implement other messages
+            else => try allocPrint(
+                alloc,
+                "{s}: TODO message", // TODO: implement other messages
+                .{DOMException.name(errCast)},
+            ),
         };
         return .{ .err = errCast, .str = str };
     }
@@ -154,6 +158,8 @@ pub fn testExecFn(
         .{ .src = "HierarchyRequestError.code", .ex = "3" },
         .{ .src = "HierarchyRequestError.message", .ex = err },
         .{ .src = "HierarchyRequestError.toString()", .ex = "HierarchyRequestError: " ++ err },
+        .{ .src = "HierarchyRequestError instanceof DOMException", .ex = "true" },
+        .{ .src = "HierarchyRequestError instanceof Error", .ex = "true" },
     };
     try checkCases(js_env, &cases);
 }
diff --git a/src/dom/implementation.zig b/src/dom/implementation.zig
index 3e4e9eaa..fc358fee 100644
--- a/src/dom/implementation.zig
+++ b/src/dom/implementation.zig
@@ -8,11 +8,14 @@ const checkCases = jsruntime.test_utils.checkCases;
 
 const Document = @import("document.zig").Document;
 const DocumentType = @import("document_type.zig").DocumentType;
+const DOMException = @import("exceptions.zig").DOMException;
 
 // WEB IDL https://dom.spec.whatwg.org/#domimplementation
 pub const DOMImplementation = struct {
     pub const mem_guarantied = true;
 
+    pub const Exception = DOMException;
+
     pub fn _createDocumentType(
         _: *DOMImplementation,
         alloc: std.mem.Allocator,
@@ -29,7 +32,7 @@ pub const DOMImplementation = struct {
         const csystemId = try alloc.dupeZ(u8, systemId);
         defer alloc.free(csystemId);
 
-        return parser.domImplementationCreateDocumentType(cqname, cpublicId, csystemId);
+        return try parser.domImplementationCreateDocumentType(cqname, cpublicId, csystemId);
     }
 
     pub fn _createDocument(
@@ -51,11 +54,11 @@ pub const DOMImplementation = struct {
             defer alloc.free(cqname.?);
         }
 
-        return parser.domImplementationCreateDocument(cnamespace, cqname, doctype);
+        return try parser.domImplementationCreateDocument(cnamespace, cqname, doctype);
     }
 
-    pub fn _createHTMLDocument(_: *DOMImplementation, title: ?[]const u8) *parser.Document {
-        return parser.domImplementationCreateHTMLDocument(title);
+    pub fn _createHTMLDocument(_: *DOMImplementation, title: ?[]const u8) !*parser.Document {
+        return try parser.domImplementationCreateHTMLDocument(title);
     }
 
     pub fn _hasFeature(_: *DOMImplementation) bool {
diff --git a/src/netsurf.zig b/src/netsurf.zig
index e6fd09a9..a7d0a22f 100644
--- a/src/netsurf.zig
+++ b/src/netsurf.zig
@@ -889,7 +889,11 @@ pub inline fn documentTypeGetSystemId(dt: *DocumentType) ![]const u8 {
 }
 
 // DOMImplementation
-pub inline fn domImplementationCreateDocument(namespace: ?[:0]const u8, qname: ?[:0]const u8, doctype: ?*DocumentType) *Document {
+pub inline fn domImplementationCreateDocument(
+    namespace: ?[:0]const u8,
+    qname: ?[:0]const u8,
+    doctype: ?*DocumentType,
+) !*Document {
     var doc: ?*Document = undefined;
 
     var ptrnamespace: [*c]const u8 = null;
@@ -902,7 +906,7 @@ pub inline fn domImplementationCreateDocument(namespace: ?[:0]const u8, qname: ?
         ptrqname = qn.ptr;
     }
 
-    _ = c.dom_implementation_create_document(
+    const err = c.dom_implementation_create_document(
         c.DOM_IMPLEMENTATION_XML,
         ptrnamespace,
         ptrqname,
@@ -911,18 +915,24 @@ pub inline fn domImplementationCreateDocument(namespace: ?[:0]const u8, qname: ?
         null,
         &doc,
     );
+    try DOMErr(err);
     return doc.?;
 }
 
-pub inline fn domImplementationCreateDocumentType(qname: [:0]const u8, publicId: [:0]const u8, systemId: [:0]const u8) *DocumentType {
+pub inline fn domImplementationCreateDocumentType(
+    qname: [:0]const u8,
+    publicId: [:0]const u8,
+    systemId: [:0]const u8,
+) !*DocumentType {
     var dt: ?*DocumentType = undefined;
-    _ = c.dom_implementation_create_document_type(qname.ptr, publicId.ptr, systemId.ptr, &dt);
+    const err = c.dom_implementation_create_document_type(qname.ptr, publicId.ptr, systemId.ptr, &dt);
+    try DOMErr(err);
     return dt.?;
 }
 
-pub inline fn domImplementationCreateHTMLDocument(title: ?[]const u8) *Document {
+pub inline fn domImplementationCreateHTMLDocument(title: ?[]const u8) !*Document {
     var doc: ?*Document = undefined;
-    _ = c.dom_implementation_create_document(
+    const err = c.dom_implementation_create_document(
         c.DOM_IMPLEMENTATION_HTML,
         null,
         null,
@@ -931,6 +941,7 @@ pub inline fn domImplementationCreateHTMLDocument(title: ?[]const u8) *Document
         null,
         &doc,
     );
+    try DOMErr(err);
     // TODO set title
     _ = title;
     return doc.?;
diff --git a/vendor/jsruntime-lib b/vendor/jsruntime-lib
index bca65e09..d63b0a59 160000
--- a/vendor/jsruntime-lib
+++ b/vendor/jsruntime-lib
@@ -1 +1 @@
-Subproject commit bca65e098513e17d5389d090ae952cf97ecd1d14
+Subproject commit d63b0a592f51e7743723a47e9faa49a7e8e61f26