diff --git a/demos/gtk-demo/filtermodel.ui b/demos/gtk-demo/filtermodel.ui
index 8d7d3acf29..585ad696cc 100644
--- a/demos/gtk-demo/filtermodel.ui
+++ b/demos/gtk-demo/filtermodel.ui
@@ -45,6 +45,9 @@
             <attributes>
               <attribute name="weight" value="bold"/>
             </attributes>
+            <accessibility>
+              <relation type="label-for" target="treeview1"/>
+            </accessibility>
           </object>
           <packing>
             <property name="left-attach">0</property>
@@ -81,6 +84,9 @@
                 </child>
               </object>
             </child>
+            <accessibility>
+              <relation type="labelled-by" target="label1"/>
+            </accessibility>
           </object>
           <packing>
             <property name="left-attach">0</property>
@@ -129,6 +135,9 @@
                 </child>
               </object>
             </child>
+            <accessibility>
+              <relation type="labelled-by" target="label2"/>
+            </accessibility>
           </object>
           <packing>
             <property name="left-attach">1</property>
@@ -142,6 +151,9 @@
             <attributes>
               <attribute name="weight" value="bold"/>
             </attributes>
+            <accessibility>
+              <relation type="label-for" target="treeview2"/>
+            </accessibility>
           </object>
           <packing>
             <property name="left-attach">1</property>
@@ -155,6 +167,9 @@
             <attributes>
               <attribute name="weight" value="bold"/>
             </attributes>
+            <accessibility>
+              <relation type="label-for" target="treeview3"/>
+            </accessibility>
           </object>
           <packing>
             <property name="left-attach">0</property>
@@ -185,6 +200,9 @@
                 </child>
               </object>
             </child>
+            <accessibility>
+              <relation type="labelled-by" target="label3"/>
+            </accessibility>
           </object>
           <packing>
             <property name="left-attach">0</property>
diff --git a/demos/gtk-demo/scale.ui b/demos/gtk-demo/scale.ui
index 7d4329d669..7654044186 100644
--- a/demos/gtk-demo/scale.ui
+++ b/demos/gtk-demo/scale.ui
@@ -27,9 +27,12 @@
         <property name="column-spacing">10</property>
         <property name="margin">20</property>
         <child>
-          <object class="GtkLabel">
+          <object class="GtkLabel" id="label_plain">
             <property name="label">Plain</property>
             <property name="xalign">0</property>
+            <accessibility>
+              <relation type="label-for" target="scale_plain"/>
+            </accessibility>
           </object>
           <packing>
             <property name="left-attach">0</property>
@@ -37,12 +40,15 @@
           </packing>
         </child>
         <child>
-          <object class="GtkScale">
+          <object class="GtkScale" id="scale_plain">
             <property name="can-focus">1</property>
             <property name="width-request">200</property>
             <property name="draw-value">0</property>
             <property name="adjustment">adjustment1</property>
             <property name="hexpand">1</property>
+            <accessibility>
+              <relation type="labelled-by" target="label_plain"/>
+            </accessibility>
           </object>
           <packing>
             <property name="left-attach">1</property>
@@ -50,9 +56,12 @@
           </packing>
         </child>
         <child>
-          <object class="GtkLabel">
+          <object class="GtkLabel" id="label_marks">
             <property name="label">Marks</property>
             <property name="xalign">0</property>
+            <accessibility>
+              <relation type="label-for" target="scale_marks"/>
+            </accessibility>
           </object>
           <packing>
             <property name="left-attach">0</property>
@@ -60,7 +69,7 @@
           </packing>
         </child>
         <child>
-          <object class="GtkScale">
+          <object class="GtkScale" id="scale_marks">
             <property name="can-focus">1</property>
             <property name="width-request">200</property>
             <property name="draw-value">0</property>
@@ -73,6 +82,9 @@
               <mark value="3" position="bottom"></mark>
               <mark value="4" position="bottom"></mark>
             </marks>
+            <accessibility>
+              <relation type="labelled-by" target="label_marks"/>
+            </accessibility>
           </object>
           <packing>
             <property name="left-attach">1</property>
@@ -80,9 +92,12 @@
           </packing>
         </child>
         <child>
-          <object class="GtkLabel">
+          <object class="GtkLabel" id="label_discrete">
             <property name="label">Discrete</property>
             <property name="xalign">0</property>
+            <accessibility>
+              <relation type="label-for" target="scale_discrete"/>
+            </accessibility>
           </object>
           <packing>
             <property name="left-attach">0</property>
@@ -90,13 +105,16 @@
           </packing>
         </child>
         <child>
-          <object class="GtkScale">
+          <object class="GtkScale" id="scale_discrete">
             <property name="can-focus">1</property>
             <property name="width-request">200</property>
             <property name="round-digits">0</property>
             <property name="draw-value">0</property>
             <property name="adjustment">adjustment3</property>
             <property name="hexpand">1</property>
+            <accessibility>
+              <relation type="labelled-by" target="label_discrete"/>
+            </accessibility>
             <marks>
               <mark value="0" position="bottom"></mark>
               <mark value="1" position="bottom"></mark>
diff --git a/demos/gtk-demo/theming.ui b/demos/gtk-demo/theming.ui
index 864a29faf0..59cd956eca 100644
--- a/demos/gtk-demo/theming.ui
+++ b/demos/gtk-demo/theming.ui
@@ -104,6 +104,7 @@
             <child>
               <object class="GtkSwitch" id="switch1">
                 <property name="can-focus">1</property>
+                <property name="tooltip_text">Switch it</property>
               </object>
             </child>
           </object>
diff --git a/demos/icon-browser/window.ui b/demos/icon-browser/window.ui
index 8692295bdf..c56dcbaa6c 100644
--- a/demos/icon-browser/window.ui
+++ b/demos/icon-browser/window.ui
@@ -133,6 +133,9 @@
               <object class="GtkImage" id="image1">
                 <property name="halign">center</property>
                 <property name="valign">end</property>
+                <accessibility>
+                  <relation type="labelled-by" target="label1"/>
+                </accessibility>
               </object>
               <packing>
                 <property name="left-attach">0</property>
@@ -143,6 +146,9 @@
               <object class="GtkImage" id="image2">
                 <property name="halign">center</property>
                 <property name="valign">end</property>
+                <accessibility>
+                  <relation type="labelled-by" target="label2"/>
+                </accessibility>
               </object>
               <packing>
                 <property name="left-attach">1</property>
@@ -153,6 +159,9 @@
               <object class="GtkImage" id="image3">
                 <property name="halign">center</property>
                 <property name="valign">end</property>
+                <accessibility>
+                  <relation type="labelled-by" target="label3"/>
+                </accessibility>
               </object>
               <packing>
                 <property name="left-attach">2</property>
@@ -163,6 +172,9 @@
               <object class="GtkImage" id="image4">
                 <property name="halign">center</property>
                 <property name="valign">end</property>
+                <accessibility>
+                  <relation type="labelled-by" target="label4"/>
+                </accessibility>
               </object>
               <packing>
                 <property name="left-attach">3</property>
@@ -173,6 +185,9 @@
               <object class="GtkImage" id="image5">
                 <property name="halign">center</property>
                 <property name="valign">end</property>
+                <accessibility>
+                  <relation type="labelled-by" target="label5"/>
+                </accessibility>
               </object>
               <packing>
                 <property name="left-attach">4</property>
@@ -183,6 +198,9 @@
               <object class="GtkImage" id="image6">
                 <property name="halign">center</property>
                 <property name="valign">end</property>
+                <accessibility>
+                  <relation type="labelled-by" target="label6"/>
+                </accessibility>
               </object>
               <packing>
                 <property name="left-attach">5</property>
@@ -197,6 +215,9 @@
                 <style>
                   <class name="dim-label"/>
                 </style>
+                <accessibility>
+                  <relation type="label-for" target="image1"/>
+                </accessibility>
               </object>
               <packing>
                 <property name="left-attach">0</property>
@@ -211,6 +232,9 @@
                 <style>
                   <class name="dim-label"/>
                 </style>
+                <accessibility>
+                  <relation type="label-for" target="image2"/>
+                </accessibility>
               </object>
               <packing>
                 <property name="left-attach">1</property>
@@ -225,6 +249,9 @@
                 <style>
                   <class name="dim-label"/>
                 </style>
+                <accessibility>
+                  <relation type="label-for" target="image3"/>
+                </accessibility>
               </object>
               <packing>
                 <property name="left-attach">2</property>
@@ -239,6 +266,9 @@
                 <style>
                   <class name="dim-label"/>
                 </style>
+                <accessibility>
+                  <relation type="label-for" target="image4"/>
+                </accessibility>
               </object>
               <packing>
                 <property name="left-attach">3</property>
@@ -253,6 +283,9 @@
                 <style>
                   <class name="dim-label"/>
                 </style>
+                <accessibility>
+                  <relation type="label-for" target="image5"/>
+                </accessibility>
               </object>
               <packing>
                 <property name="left-attach">4</property>
@@ -267,6 +300,9 @@
                 <style>
                   <class name="dim-label"/>
                 </style>
+                <accessibility>
+                  <relation type="label-for" target="image6"/>
+                </accessibility>
               </object>
               <packing>
                 <property name="left-attach">5</property>
diff --git a/demos/widget-factory/widget-factory.ui b/demos/widget-factory/widget-factory.ui
index 8474d08d76..585bb3db5b 100644
--- a/demos/widget-factory/widget-factory.ui
+++ b/demos/widget-factory/widget-factory.ui
@@ -3464,9 +3464,12 @@ bad things might happen.</property>
         <property name="row-spacing">10</property>
         <property name="column-spacing">10</property>
         <child>
-          <object class="GtkLabel">
+          <object class="GtkLabel" id="title_label">
             <property name="label">Title:</property>
             <property name="xalign">1</property>
+            <accessibility>
+              <relation type="label-for" target="open_popover_entry"/>
+            </accessibility>
           </object>
           <packing>
             <property name="left-attach">0</property>
@@ -3474,10 +3477,13 @@ bad things might happen.</property>
           </packing>
         </child>
         <child>
-          <object class="GtkLabel">
+          <object class="GtkLabel" id="description_label">
             <property name="valign">start</property>
             <property name="label">Description:</property>
             <property name="xalign">1</property>
+            <accessibility>
+              <relation type="label-for" target="open_popover_textview"/>
+            </accessibility>
           </object>
           <packing>
             <property name="left-attach">0</property>
@@ -3493,7 +3499,11 @@ bad things might happen.</property>
             <property name="min-content-width">100</property>
             <property name="max-content-width">100</property>
             <child>
-              <object class="GtkTextView" id="open_popover_textview"/>
+              <object class="GtkTextView" id="open_popover_textview">
+                <accessibility>
+                  <relation type="labelled-by" target="description_label"/>
+                </accessibility>
+              </object>
             </child>
           </object>
           <packing>
@@ -3504,6 +3514,9 @@ bad things might happen.</property>
         <child>
           <object class="GtkEntry" id="open_popover_entry">
             <property name="activates-default">1</property>
+            <accessibility>
+              <relation type="labelled-by" target="title_label"/>
+            </accessibility>
           </object>
           <packing>
             <property name="left-attach">1</property>