diff --git a/gtk/inspector/css-editor.c b/gtk/inspector/css-editor.c
index e8515a4bea..fe16f3b13f 100644
--- a/gtk/inspector/css-editor.c
+++ b/gtk/inspector/css-editor.c
@@ -47,6 +47,7 @@ struct _GtkInspectorCssEditorPrivate
   GtkToggleButton *disable_button;
   guint timeout;
   GList *errors;
+  gboolean show_deprecations;
 };
 
 typedef struct {
@@ -94,6 +95,12 @@ query_tooltip_cb (GtkWidget             *widget,
     {
       CssError *css_error = l->data;
 
+      if (g_error_matches (css_error->error,
+                           GTK_CSS_PARSER_WARNING,
+                           GTK_CSS_PARSER_WARNING_DEPRECATED) &&
+          !ce->priv->show_deprecations)
+        continue;
+
       if (gtk_text_iter_in_range (&iter, &css_error->start, &css_error->end))
         {
           gtk_tooltip_set_text (tooltip, css_error->error->message);
@@ -170,6 +177,29 @@ disable_toggled (GtkToggleButton       *button,
                                                 GTK_STYLE_PROVIDER_PRIORITY_USER);
 }
 
+static void
+toggle_deprecations (GtkToggleButton       *button,
+                     GtkInspectorCssEditor *ce)
+{
+  GtkTextTagTable *tags;
+  GtkTextTag *tag;
+  PangoUnderline underline;
+
+  if (!ce->priv->display)
+    return;
+
+  ce->priv->show_deprecations = gtk_toggle_button_get_active (button);
+
+  tags = gtk_text_buffer_get_tag_table (GTK_TEXT_BUFFER (ce->priv->text));
+  tag = gtk_text_tag_table_lookup (tags, "deprecation");
+  if (ce->priv->show_deprecations)
+    underline = PANGO_UNDERLINE_SINGLE;
+  else
+    underline = PANGO_UNDERLINE_NONE;
+
+  g_object_set (tag, "underline", underline, NULL);
+}
+
 static char *
 get_current_text (GtkTextBuffer *buffer)
 {
@@ -316,7 +346,12 @@ show_parsing_error (GtkCssProvider        *provider,
                                           end->line_bytes);
 
   if (error->domain == GTK_CSS_PARSER_WARNING)
-    tag_name = "warning";
+    {
+      if (error->code == GTK_CSS_PARSER_WARNING_DEPRECATED)
+        tag_name = "deprecation";
+      else
+        tag_name = "warning";
+    }
   else
     tag_name = "error";
 
@@ -407,6 +442,7 @@ gtk_inspector_css_editor_class_init (GtkInspectorCssEditorClass *klass)
   gtk_widget_class_bind_template_child_private (widget_class, GtkInspectorCssEditor, view);
   gtk_widget_class_bind_template_child_private (widget_class, GtkInspectorCssEditor, disable_button);
   gtk_widget_class_bind_template_callback (widget_class, disable_toggled);
+  gtk_widget_class_bind_template_callback (widget_class, toggle_deprecations);
   gtk_widget_class_bind_template_callback (widget_class, save_clicked);
   gtk_widget_class_bind_template_callback (widget_class, text_changed);
   gtk_widget_class_bind_template_callback (widget_class, query_tooltip_cb);
diff --git a/gtk/inspector/css-editor.ui b/gtk/inspector/css-editor.ui
index 7663af860b..7500f95860 100644
--- a/gtk/inspector/css-editor.ui
+++ b/gtk/inspector/css-editor.ui
@@ -7,6 +7,13 @@
         <property name="underline-rgba">darkorange</property>
       </object>
     </child>
+    <child type="tag">
+      <object class="GtkTextTag">
+        <property name="name">deprecation</property>
+        <property name="underline">none</property>
+        <property name="underline-rgba">blue</property>
+      </object>
+    </child>
     <child type="tag">
       <object class="GtkTextTag">
         <property name="name">error</property>
@@ -39,6 +46,13 @@
             <signal name="clicked" handler="save_clicked"/>
           </object>
         </child>
+        <child>
+          <object class="GtkToggleButton" id="deprections_button">
+            <property name="tooltip-text" translatable="yes">Show deprecations</property>
+            <property name="icon-name">dialog-information-symbolic</property>
+            <signal name="toggled" handler="toggle_deprecations"/>
+          </object>
+        </child>
       </object>
     </child>
     <child>