Bug 857355 - Hide HTMLInputElement's inputMode behind a pref and only turn it on for Nightly/Aurora. r=smaug

content/events/src/nsIMEStateManager.cpp

@@ -490,8 +490,12 @@ nsIMEStateManager::SetIMEState(const IMEState &aState,
     } else {
       context.mHTMLInputType.Assign(nsGkAtoms::textarea->GetUTF16String());
     }
+
+    if (Preferences::GetBool("dom.forms.inputmode", false)) {
       aContent->GetAttr(kNameSpaceID_None, nsGkAtoms::inputmode,
                         context.mHTMLInputInputmode);
+    }
+
     aContent->GetAttr(kNameSpaceID_None, nsGkAtoms::moz_action_hint,
                       context.mActionHint);
 

content/html/content/test/forms/test_input_attributes_reflection.html

@@ -110,6 +110,7 @@ reflectUnsignedInt({
 // .indeterminate doesn't reflect a content attribute.
 
 // .inputmode
+if (SpecialPowers.getBoolPref("dom.forms.inputmode")) {
 reflectLimitedEnumerated({
   element: document.createElement("input"),
   attribute: "inputMode",
@@ -117,6 +118,7 @@ reflectLimitedEnumerated({
   invalidValues: [ "", "foo", "tulip" ],
   defaultValue: "auto"
 });
+}
 
 // TODO: list (HTMLElement)
 

dom/webidl/HTMLInputElement.webidl

@@ -47,7 +47,7 @@ interface HTMLInputElement : HTMLElement {
            attribute unsigned long height;
   [Pure]
            attribute boolean indeterminate;
-  [Pure, SetterThrows]
+  [Pure, SetterThrows, Pref="dom.forms.inputmode"]
            attribute DOMString inputMode;
   [Pure]
   readonly attribute HTMLElement? list;

modules/libpref/src/init/all.js

@@ -4205,3 +4205,9 @@ pref("captivedetect.maxWaitingTime", 5000);
 pref("captivedetect.pollingTime", 3000);
 pref("captivedetect.maxRetryCount", 5);
 #endif
+
+#ifdef RELEASE_BUILD
+pref("dom.forms.inputmode", false);
+#else
+pref("dom.forms.inputmode", true);
+#endif