Fixed #19686 -- Added HTML5 number input type

Thanks Simon Charette for his help on the patch. Refs #16630.

docs/ref/forms/fields.txt

@@ -454,7 +454,8 @@ For each field, we describe the default widget used if you don't specify
 
 .. class:: DecimalField(**kwargs)
 
-    * Default widget: :class:`TextInput`
+    * Default widget: :class:`NumberInput` when :attr:`Field.localize` is
+      ``False``, else :class:`TextInput`.
     * Empty value: ``None``
     * Normalizes to: A Python ``decimal``.
     * Validates that the given value is a decimal. Leading and trailing
@@ -580,7 +581,8 @@ For each field, we describe the default widget used if you don't specify
 
 .. class:: FloatField(**kwargs)
 
-    * Default widget: :class:`TextInput`
+    * Default widget: :class:`NumberInput` when :attr:`Field.localize` is
+      ``False``, else :class:`TextInput`.
     * Empty value: ``None``
     * Normalizes to: A Python float.
     * Validates that the given value is an float. Leading and trailing
@@ -621,7 +623,8 @@ For each field, we describe the default widget used if you don't specify
 
 .. class:: IntegerField(**kwargs)
 
-    * Default widget: :class:`TextInput`
+    * Default widget: :class:`NumberInput` when :attr:`Field.localize` is
+      ``False``, else :class:`TextInput`.
     * Empty value: ``None``
     * Normalizes to: A Python integer or long integer.
     * Validates that the given value is an integer. Leading and trailing

docs/ref/forms/widgets.txt

@@ -389,6 +389,19 @@ These widgets make use of the HTML elements ``input`` and ``textarea``.
 
     Text input: ``<input type="text" ...>``
 
+``NumberInput``
+~~~~~~~~~~~~~~~
+
+.. class:: NumberInput
+
+    .. versionadded:: 1.6
+
+    Text input: ``<input type="number" ...>``
+
+    Beware that not all browsers support entering localized numbers in
+    ``number`` input types. Django itself avoids using them for fields having
+    their :attr:`~django.forms.Field.localize` property to ``True``.
+
 ``EmailInput``
 ~~~~~~~~~~~~~~