diff --git a/gtkblueprinttool/extensions/gtk_a11y.py b/gtkblueprinttool/extensions/gtk_a11y.py
index d9bc57c..6fb834b 100644
--- a/gtkblueprinttool/extensions/gtk_a11y.py
+++ b/gtkblueprinttool/extensions/gtk_a11y.py
@@ -106,6 +106,14 @@ def _get_docs(gir, name):
 
 
 class A11y(AstNode):
+    @validate("accessibility")
+    def container_is_widget(self):
+        widget = self.root.gir.get_type("Widget", "Gtk")
+        container_type = self.parent_by_type(ast.Object).gir_class
+        if container_type and not container_type.assignable_to(widget):
+            raise CompileError(f"{container_type.full_name} is not a {widget.full_name}, so it doesn't have accessibility properties")
+
+
     def emit_xml(self, xml: XmlEmitter):
         xml.start_tag("accessibility")
         for child in self.children:
@@ -158,7 +166,7 @@ a11y_prop = Group(
 a11y = Group(
     A11y,
     Sequence(
-        Keyword("accessibility"),
+        Keyword("accessibility", True),
         OpenBlock().expected("`{`"),
         Until(a11y_prop, CloseBlock()),
     )
diff --git a/gtkblueprinttool/extensions/gtk_layout.py b/gtkblueprinttool/extensions/gtk_layout.py
index 9a821ca..9ef05e5 100644
--- a/gtkblueprinttool/extensions/gtk_layout.py
+++ b/gtkblueprinttool/extensions/gtk_layout.py
@@ -19,7 +19,7 @@
 
 
 from ..ast import BaseAttribute
-from ..ast_utils import AstNode
+from ..ast_utils import AstNode, validate
 from ..completions_utils import *
 from ..lsp_utils import Completion, CompletionItemKind
 from ..parse_tree import *
@@ -28,6 +28,14 @@ from ..xml_emitter import XmlEmitter
 
 
 class Layout(AstNode):
+    @validate("layout")
+    def container_is_widget(self):
+        widget = self.root.gir.get_type("Widget", "Gtk")
+        container_type = self.parent_by_type(ast.Object).gir_class
+        if container_type and not container_type.assignable_to(widget):
+            raise CompileError(f"{container_type.full_name} is not a {widget.full_name}, so it doesn't have layout properties")
+
+
     def emit_xml(self, xml: XmlEmitter):
         xml.start_tag("layout")
         for child in self.children:
@@ -56,7 +64,7 @@ layout_prop = Group(
 layout = Group(
     Layout,
     Sequence(
-        Keyword("layout"),
+        Keyword("layout", True),
         OpenBlock().expected("`{`"),
         Until(layout_prop, CloseBlock()),
     )
diff --git a/gtkblueprinttool/parse_tree.py b/gtkblueprinttool/parse_tree.py
index 2288dfa..551f403 100644
--- a/gtkblueprinttool/parse_tree.py
+++ b/gtkblueprinttool/parse_tree.py
@@ -514,12 +514,16 @@ class UseLiteral(ParseNode):
 
 class Keyword(ParseNode):
     """ Matches the given identifier. """
-    def __init__(self, kw):
+    def __init__(self, kw, set_token=False):
         self.kw = kw
+        self.set_token = True
 
     def _parse(self, ctx: ParseContext):
         token = ctx.next_token()
         if token.type != TokenType.IDENT:
             return False
 
+        if self.set_token:
+            ctx.set_group_val(self.kw, True, token)
+
         return str(token) == self.kw
diff --git a/tests/sample_errors/a11y_in_non_widget.blp b/tests/sample_errors/a11y_in_non_widget.blp
new file mode 100644
index 0000000..9609a0c
--- /dev/null
+++ b/tests/sample_errors/a11y_in_non_widget.blp
@@ -0,0 +1,6 @@
+using Gtk 4.0;
+using GObject 2.0;
+
+GObject.Object {
+  accessibility {}
+}
diff --git a/tests/sample_errors/a11y_in_non_widget.err b/tests/sample_errors/a11y_in_non_widget.err
new file mode 100644
index 0000000..68d43dc
--- /dev/null
+++ b/tests/sample_errors/a11y_in_non_widget.err
@@ -0,0 +1 @@
+5,3,13,GObject.Object is not a Gtk.Widget, so it doesn't have accessibility properties
diff --git a/tests/sample_errors/layout_in_non_widget.blp b/tests/sample_errors/layout_in_non_widget.blp
new file mode 100644
index 0000000..26c27c3
--- /dev/null
+++ b/tests/sample_errors/layout_in_non_widget.blp
@@ -0,0 +1,6 @@
+using Gtk 4.0;
+using GObject 2.0;
+
+GObject.Object {
+  layout {}
+}
diff --git a/tests/sample_errors/layout_in_non_widget.err b/tests/sample_errors/layout_in_non_widget.err
new file mode 100644
index 0000000..3dccc2d
--- /dev/null
+++ b/tests/sample_errors/layout_in_non_widget.err
@@ -0,0 +1 @@
+5,3,6,GObject.Object is not a Gtk.Widget, so it doesn't have layout properties
diff --git a/tests/test_samples.py b/tests/test_samples.py
index d987584..ebf415a 100644
--- a/tests/test_samples.py
+++ b/tests/test_samples.py
@@ -112,6 +112,7 @@ class TestSamples(unittest.TestCase):
 
 
     def test_sample_errors(self):
+        self.assert_sample_error("a11y_in_non_widget")
         self.assert_sample_error("a11y_prop_dne")
         self.assert_sample_error("a11y_prop_obj_dne")
         self.assert_sample_error("a11y_prop_type")
@@ -120,6 +121,7 @@ class TestSamples(unittest.TestCase):
         self.assert_sample_error("duplicate_obj_id")
         self.assert_sample_error("enum_member_dne")
         self.assert_sample_error("invalid_bool")
+        self.assert_sample_error("layout_in_non_widget")
         self.assert_sample_error("ns_not_imported")
         self.assert_sample_error("not_a_class")
         self.assert_sample_error("object_dne")