dom: implement document.createAttribute

src/dom/document.zig

@@ -153,6 +153,10 @@ pub const Document = struct {
         return try parser.documentAdoptNode(self, node);
     }
 
+    pub fn _createAttribute(self: *parser.Document, name: []const u8) !*parser.Attribute {
+        return try parser.documentCreateAttribute(self, name);
+    }
+
     pub fn deinit(_: *parser.Document, _: std.mem.Allocator) void {}
 };
 
@@ -283,6 +287,11 @@ pub fn testExecFn(
     };
     try checkCases(js_env, &adoptNode);
 
+    var createAttr = [_]Case{
+        .{ .src = "document.createAttribute('foo')", .ex = "[object Attr]" },
+    };
+    try checkCases(js_env, &createAttr);
+
     const tags = comptime parser.Tag.all();
     comptime var createElements: [(tags.len) * 2]Case = undefined;
     inline for (tags, 0..) |tag, i| {

src/netsurf.zig

@@ -1192,6 +1192,13 @@ pub inline fn documentAdoptNode(doc: *Document, node: *Node) !*Node {
     return @as(*Node, @ptrCast(res));
 }
 
+pub inline fn documentCreateAttribute(doc: *Document, name: []const u8) !*Attribute {
+    var attr: ?*Attribute = undefined;
+    const err = documentVtable(doc).dom_document_create_attribute.?(doc, try strFromData(name), &attr);
+    try DOMErr(err);
+    return attr.?;
+}
+
 // DocumentHTML
 pub const DocumentHTML = c.dom_html_document;