Bug 558036 - make HTML <output> accessible. r=MarcoZ,surkov a=davidb

accessible/src/base/nsAccessibilityAtomList.h

@@ -138,6 +138,7 @@ ACCESSIBILITY_ATOM(object, "object")
 ACCESSIBILITY_ATOM(ol, "ol")
 ACCESSIBILITY_ATOM(optgroup, "optgroup")
 ACCESSIBILITY_ATOM(option, "option")
+ACCESSIBILITY_ATOM(output, "output")
 ACCESSIBILITY_ATOM(panel, "panel") // XUL
 ACCESSIBILITY_ATOM(q, "q")
 ACCESSIBILITY_ATOM(select, "select")

accessible/src/base/nsAccessibilityService.cpp

@@ -1648,6 +1648,12 @@ nsAccessibilityService::CreateHTMLAccessibleByMarkup(nsIFrame* aFrame,
     return accessible;
   }
 
+  if (tag == nsAccessibilityAtoms::output) {
+    nsAccessible* accessible = new nsHTMLOutputAccessible(aContent, aWeakShell);
+    NS_IF_ADDREF(accessible);
+    return accessible;
+  }
+
   return nsnull;
  }
 

accessible/src/base/nsAccessible.cpp

@@ -2158,9 +2158,18 @@ nsAccessible::GetRelationByType(PRUint32 aRelationType,
 
   case nsIAccessibleRelation::RELATION_CONTROLLER_FOR:
     {
-      return nsRelUtils::
+      nsresult rv = nsRelUtils::
         AddTargetFromIDRefsAttr(aRelationType, aRelation, mContent,
                                 nsAccessibilityAtoms::aria_controls);
+      NS_ENSURE_SUCCESS(rv,rv);
+
+      if (rv != NS_OK_NO_RELATION_TARGET)
+        return NS_OK; // XXX bug 381599, avoid performance problems      
+
+      return nsRelUtils::
+        AddTargetFromNeighbour(aRelationType, aRelation, mContent,
+                               nsAccessibilityAtoms::_for,
+                               nsAccessibilityAtoms::output);
     }
 
   case nsIAccessibleRelation::RELATION_FLOWS_TO:

accessible/src/html/nsHTMLTextAccessible.cpp

@@ -40,6 +40,8 @@
 #include "nsHTMLTextAccessible.h"
 
 #include "nsDocAccessible.h"
+#include "nsAccUtils.h"
+#include "nsRelUtils.h"
 #include "nsTextEquivUtils.h"
 
 #include "nsIFrame.h"
@@ -195,6 +197,56 @@ nsHTMLLabelAccessible::NativeRole()
   return nsIAccessibleRole::ROLE_LABEL;
 }
 
+////////////////////////////////////////////////////////////////////////////////
+// nsHTMLOuputAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+nsHTMLOutputAccessible::
+  nsHTMLOutputAccessible(nsIContent* aContent, nsIWeakReference* aShell) :
+  nsHyperTextAccessibleWrap(aContent, aShell)
+{
+}
+
+NS_IMPL_ISUPPORTS_INHERITED0(nsHTMLOutputAccessible, nsHyperTextAccessible)
+
+NS_IMETHODIMP
+nsHTMLOutputAccessible::GetRelationByType(PRUint32 aRelationType,
+                                          nsIAccessibleRelation** aRelation)
+{
+  nsresult rv = nsAccessibleWrap::GetRelationByType(aRelationType, aRelation);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (rv != NS_OK_NO_RELATION_TARGET)
+    return NS_OK; // XXX bug 381599, avoid performance problems
+
+  if (aRelationType == nsIAccessibleRelation::RELATION_CONTROLLED_BY) {
+    return nsRelUtils::
+      AddTargetFromIDRefsAttr(aRelationType, aRelation, mContent,
+                              nsAccessibilityAtoms::_for);
+  }
+
+  return NS_OK;
+}
+
+PRUint32
+nsHTMLOutputAccessible::NativeRole()
+{
+  return nsIAccessibleRole::ROLE_SECTION;
+}
+
+nsresult
+nsHTMLOutputAccessible::GetAttributesInternal(nsIPersistentProperties* aAttributes)
+{
+  nsresult rv = nsAccessibleWrap::GetAttributesInternal(aAttributes);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsAccUtils::SetAccAttr(aAttributes, nsAccessibilityAtoms::live,
+                         NS_LITERAL_STRING("polite"));
+  
+  return NS_OK;
+}
+
+
 ////////////////////////////////////////////////////////////////////////////////
 // nsHTMLLIAccessible
 ////////////////////////////////////////////////////////////////////////////////

accessible/src/html/nsHTMLTextAccessible.h

@@ -105,6 +105,25 @@ public:
   virtual PRUint32 NativeRole();
 };
 
+/**
+ * Used for HTML output element.
+ */
+class nsHTMLOutputAccessible : public nsHyperTextAccessibleWrap
+{
+public:
+  nsHTMLOutputAccessible(nsIContent* aContent, nsIWeakReference* aShell);
+
+  NS_DECL_ISUPPORTS_INHERITED
+
+  // nsIAccessible
+  NS_IMETHOD GetRelationByType(PRUint32 aRelationType,
+                               nsIAccessibleRelation** aRelation);
+
+  // nsAccessible
+  virtual PRUint32 NativeRole();
+  virtual nsresult GetAttributesInternal(nsIPersistentProperties* aAttributes);
+};
+
 /**
  * Used for bullet of HTML list item element (for example, HTML li).
  */

accessible/tests/mochitest/attributes/test_obj.html

@@ -3,6 +3,7 @@
 https://bugzilla.mozilla.org/show_bug.cgi?id=475006
 https://bugzilla.mozilla.org/show_bug.cgi?id=391829
 https://bugzilla.mozilla.org/show_bug.cgi?id=581952
+https://bugzilla.mozilla.org/show_bug.cgi?id=558036
 -->
 <head>
   <title>Group attributes tests</title>
@@ -39,6 +40,11 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=581952
       testAttrs("sortOther", {"sort" : "other"}, true);
 
       // live object attribute
+      
+      // HTML
+      testAttrs("output", {"live" : "polite"}, true);
+
+      // ARIA
       testAttrs("live", {"live" : "polite"}, true);
       testAttrs("live2", {"live" : "polite"}, true);
       testAbsentAttrs("live3", {"live" : ""});
@@ -108,6 +114,11 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=581952
      title="Make explicit that aria-label is not an object attribute">
     Mozilla Bug 475006
   </a>
+  <a target="_blank"
+     href="https://bugzilla.mozilla.org/show_bug.cgi?id=558036"
+     title="make HTML <output> accessible">
+    Mozilla Bug 558036
+  </a>
 
   <p id="display"></p>
   <div id="content" style="display: none"></div>
@@ -130,6 +141,10 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=581952
   <div id="sortNone" role="columnheader" aria-sort="none"></div>
   <div id="sortOther" role="columnheader" aria-sort="other"></div>
 
+  <!-- html -->
+  <output id="output"></output>
+
+  <!-- back to aria -->
   <div id="live" aria-live="polite">excuse <div id="liveChild">me</div></div>
   <div id="live2" role="marquee" aria-live="polite">excuse <div id="live2Child">me</div></div>
   <div id="live3" role="region">excuse</div>

accessible/tests/mochitest/relations/test_general.html

@@ -85,6 +85,11 @@
       // 'default button' relation
       testRelation("input", RELATION_DEFAULT_BUTTON, "submit");
 
+      // output 'for' relations
+      testRelation("output", RELATION_CONTROLLED_BY, ["input", "input2"]);
+      testRelation("input", RELATION_CONTROLLER_FOR, "output");
+      testRelation("input2", RELATION_CONTROLLER_FOR, "output");
+
       // 'described by'/'description for' relation for html:table and
       // html:caption
       testRelation("caption", RELATION_DESCRIPTION_FOR, "table");
@@ -125,6 +130,11 @@
      title="mochitests for accessible relations">
     Mozilla Bug 475298
   </a>
+  <a target="_blank"
+     href="https://bugzilla.mozilla.org/show_bug.cgi?id=558036"
+     title="make HTML <output> accessible">
+    Mozilla Bug 558036
+  </a>
   <p id="display"></p>
   <div id="content" style="display: none"></div>
   <pre id="test">
@@ -189,9 +199,11 @@
   <span id="flowfrom1">flow from</span>
   <span id="flowfrom2">flow from</span>
 
-  <form>
+  <form id="form">
     <input id="input" />
+    <input id="input2" />
     <input type="submit" id="submit" />
+    <output id="output" style="display:block" for="input input2"></output>
   </form>
 
   <table id="table">

accessible/tests/mochitest/tree/test_formctrl.html

@@ -61,6 +61,16 @@
       };
       testAccessibleTree("image_submit", accTree);
 
+      accTree = {
+        role: ROLE_SECTION,
+        children: [
+          {
+            role: ROLE_TEXT_LEAF
+          }
+        ]
+      };
+      testAccessibleTree("output", accTree);
+
       SimpleTest.finish();
     }
 
@@ -80,6 +90,11 @@
     href="https://bugzilla.mozilla.org/show_bug.cgi?id=524521">
      Mozilla Bug 524521
   </a>
+  <a target="_blank"
+     href="https://bugzilla.mozilla.org/show_bug.cgi?id=558036"
+     title="make HTML <output> accessible">
+    Mozilla Bug 558036
+  </a>
   <p id="display"></p>
   <div id="content" style="display: none"></div>
   <pre id="test">
@@ -92,5 +107,6 @@
 
   <input type="submit" id="submit">
   <input type="image" id="image_submit">
+  <output id="output">1337</output>
 </body>
 </html>