diff --git a/lib/standards/aria-roles.js b/lib/standards/aria-roles.js
index 7a39a1486d..340fdb9b14 100644
--- a/lib/standards/aria-roles.js
+++ b/lib/standards/aria-roles.js
@@ -18,11 +18,13 @@
 const ariaRoles = {
   alert: {
     type: 'widget',
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: ['aria-expanded'],
     superclassRole: ['section']
   },
   alertdialog: {
     type: 'widget',
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: ['aria-expanded', 'aria-modal'],
     superclassRole: ['alert', 'dialog'],
     accessibleNameRequired: true
@@ -38,11 +40,13 @@ const ariaRoles = {
   },
   article: {
     type: 'structure',
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: ['aria-posinset', 'aria-setsize', 'aria-expanded'],
     superclassRole: ['document']
   },
   banner: {
     type: 'landmark',
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: ['aria-expanded'],
     superclassRole: ['landmark']
   },
@@ -67,6 +71,7 @@ const ariaRoles = {
   cell: {
     type: 'structure',
     requiredContext: ['row'],
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: [
       'aria-colindex',
       'aria-colspan',
@@ -82,7 +87,7 @@ const ariaRoles = {
     // Note: aria-required is not in the 1.1 spec but is
     // consistently supported in ATs and was added in 1.2
     requiredAttrs: ['aria-checked'],
-    allowedAttrs: ['aria-readonly', 'aria-required'],
+    allowedAttrs: ['aria-readonly', 'aria-expanded', 'aria-required'],
     superclassRole: ['input'],
     accessibleNameRequired: true,
     nameFromContent: true,
@@ -96,6 +101,7 @@ const ariaRoles = {
   columnheader: {
     type: 'structure',
     requiredContext: ['row'],
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: [
       'aria-sort',
       'aria-colindex',
@@ -132,6 +138,7 @@ const ariaRoles = {
   },
   complementary: {
     type: 'landmark',
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: ['aria-expanded'],
     superclassRole: ['landmark']
   },
@@ -141,6 +148,7 @@ const ariaRoles = {
   },
   contentinfo: {
     type: 'landmark',
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: ['aria-expanded'],
     superclassRole: ['landmark']
   },
@@ -151,6 +159,7 @@ const ariaRoles = {
   },
   definition: {
     type: 'structure',
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: ['aria-expanded'],
     superclassRole: ['section']
   },
@@ -161,6 +170,7 @@ const ariaRoles = {
   },
   dialog: {
     type: 'widget',
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: ['aria-expanded', 'aria-modal'],
     superclassRole: ['window'],
     accessibleNameRequired: true
@@ -168,6 +178,7 @@ const ariaRoles = {
   directory: {
     type: 'structure',
     deprecated: true,
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: ['aria-expanded'],
     superclassRole: ['list'],
     // Note: spec difference
@@ -175,6 +186,7 @@ const ariaRoles = {
   },
   document: {
     type: 'structure',
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: ['aria-expanded'],
     superclassRole: ['structure']
   },
@@ -186,11 +198,13 @@ const ariaRoles = {
   feed: {
     type: 'structure',
     requiredOwned: ['article'],
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: ['aria-expanded'],
     superclassRole: ['list']
   },
   figure: {
     type: 'structure',
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: ['aria-expanded'],
     superclassRole: ['section'],
     // Note: spec difference
@@ -198,12 +212,14 @@ const ariaRoles = {
   },
   form: {
     type: 'landmark',
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: ['aria-expanded'],
     superclassRole: ['landmark']
   },
   grid: {
     type: 'composite',
     requiredOwned: ['rowgroup', 'row'],
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: [
       'aria-level',
       'aria-multiselectable',
@@ -235,12 +251,14 @@ const ariaRoles = {
   },
   group: {
     type: 'structure',
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: ['aria-activedescendant', 'aria-expanded'],
     superclassRole: ['section']
   },
   heading: {
     type: 'structure',
     requiredAttrs: ['aria-level'],
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: ['aria-expanded'],
     superclassRole: ['sectionhead'],
     // Note: spec difference
@@ -249,6 +267,7 @@ const ariaRoles = {
   },
   img: {
     type: 'structure',
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: ['aria-expanded'],
     superclassRole: ['section'],
     accessibleNameRequired: true,
@@ -277,6 +296,7 @@ const ariaRoles = {
   list: {
     type: 'structure',
     requiredOwned: ['listitem'],
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: ['aria-expanded'],
     superclassRole: ['section']
   },
@@ -309,21 +329,25 @@ const ariaRoles = {
   },
   log: {
     type: 'widget',
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: ['aria-expanded'],
     superclassRole: ['section']
   },
   main: {
     type: 'landmark',
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: ['aria-expanded'],
     superclassRole: ['landmark']
   },
   marquee: {
     type: 'widget',
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: ['aria-expanded'],
     superclassRole: ['section']
   },
   math: {
     type: 'structure',
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: ['aria-expanded'],
     superclassRole: ['section'],
     childrenPresentational: true
@@ -339,6 +363,7 @@ const ariaRoles = {
       'menu',
       'separator'
     ],
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: [
       'aria-activedescendant',
       'aria-expanded',
@@ -357,6 +382,7 @@ const ariaRoles = {
       'menu',
       'separator'
     ],
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: [
       'aria-activedescendant',
       'aria-expanded',
@@ -419,6 +445,7 @@ const ariaRoles = {
   },
   navigation: {
     type: 'landmark',
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: ['aria-expanded'],
     superclassRole: ['landmark']
   },
@@ -429,6 +456,7 @@ const ariaRoles = {
   },
   note: {
     type: 'structure',
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: ['aria-expanded'],
     superclassRole: ['section']
   },
@@ -461,6 +489,7 @@ const ariaRoles = {
   },
   progressbar: {
     type: 'widget',
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: [
       'aria-expanded',
       'aria-valuemax',
@@ -486,6 +515,7 @@ const ariaRoles = {
   radiogroup: {
     type: 'composite',
     // Note: spec difference (no required owned)
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: [
       'aria-readonly',
       'aria-required',
@@ -503,6 +533,7 @@ const ariaRoles = {
   },
   region: {
     type: 'landmark',
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: ['aria-expanded'],
     superclassRole: ['landmark'],
     // Note: spec difference
@@ -539,6 +570,7 @@ const ariaRoles = {
   rowheader: {
     type: 'structure',
     requiredContext: ['row'],
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: [
       'aria-sort',
       'aria-colindex',
@@ -577,6 +609,7 @@ const ariaRoles = {
   },
   search: {
     type: 'landmark',
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: ['aria-expanded'],
     superclassRole: ['landmark']
   },
@@ -664,6 +697,7 @@ const ariaRoles = {
   },
   status: {
     type: 'widget',
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: ['aria-expanded'],
     superclassRole: ['section']
   },
@@ -689,7 +723,7 @@ const ariaRoles = {
   switch: {
     type: 'widget',
     requiredAttrs: ['aria-checked'],
-    allowedAttrs: ['aria-readonly', 'aria-required'],
+    allowedAttrs: ['aria-expanded', 'aria-readonly', 'aria-required'],
     superclassRole: ['checkbox'],
     accessibleNameRequired: true,
     nameFromContent: true,
@@ -704,6 +738,7 @@ const ariaRoles = {
   tab: {
     type: 'widget',
     requiredContext: ['tablist'],
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: [
       'aria-posinset',
       'aria-selected',
@@ -717,6 +752,7 @@ const ariaRoles = {
   table: {
     type: 'structure',
     requiredOwned: ['rowgroup', 'row'],
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: ['aria-colcount', 'aria-rowcount', 'aria-expanded'],
     // NOTE: although the spec says this is not named from contents,
     // the accessible text acceptance tests (#139 and #140) require
@@ -743,6 +779,7 @@ const ariaRoles = {
   },
   tabpanel: {
     type: 'widget',
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: ['aria-expanded'],
     superclassRole: ['section'],
     // Note: spec difference
@@ -750,6 +787,7 @@ const ariaRoles = {
   },
   term: {
     type: 'structure',
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: ['aria-expanded'],
     superclassRole: ['section'],
     // Note: spec difference
@@ -779,11 +817,13 @@ const ariaRoles = {
   },
   timer: {
     type: 'widget',
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: ['aria-expanded'],
     superclassRole: ['status']
   },
   toolbar: {
     type: 'structure',
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: [
       'aria-orientation',
       'aria-activedescendant',
@@ -794,6 +834,7 @@ const ariaRoles = {
   },
   tooltip: {
     type: 'structure',
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: ['aria-expanded'],
     superclassRole: ['section'],
     nameFromContent: true
@@ -801,6 +842,7 @@ const ariaRoles = {
   tree: {
     type: 'composite',
     requiredOwned: ['group', 'treeitem'],
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: [
       'aria-multiselectable',
       'aria-required',
@@ -815,6 +857,7 @@ const ariaRoles = {
   treegrid: {
     type: 'composite',
     requiredOwned: ['rowgroup', 'row'],
+    // Spec difference: Aria-expanded removed in 1.2
     allowedAttrs: [
       'aria-activedescendant',
       'aria-colcount',
diff --git a/test/integration/rules/aria-allowed-attr/passes.html b/test/integration/rules/aria-allowed-attr/passes.html
index 1812f63cdc..dfef5d3ed5 100644
--- a/test/integration/rules/aria-allowed-attr/passes.html
+++ b/test/integration/rules/aria-allowed-attr/passes.html
@@ -1901,6 +1901,7 @@
 <div
   role="switch"
   id="pass62"
+  aria-expanded="value"
   aria-checked="value"
   aria-atomic="value"
   aria-braillelabel="value"
@@ -2092,8 +2093,9 @@
 <button id="pass73" aria-roledescription="attachment button"></button>
 <input
   type="checkbox"
-  aria-roledescription="cuisine type checkbox"
   id="pass74"
+  aria-roledescription="cuisine type checkbox"
+  aria-expanded="false"
 />
 
 <span role="radio" id="pass75" aria-checked="false">I am RED!</span>