From 9b01642969859b7a6d3d3f9467eec5bf8415df3f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=89loi=20Rivard?= <eloi@yaal.coop>
Date: Wed, 11 Oct 2023 00:00:22 +0200
Subject: [PATCH] fix: remove 'required' flag usage on some widgets

MDN tells that 'required' is not available on Hidden, Range and Color
widgets.
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input
---
 CHANGES.rst                 | 4 +++-
 src/wtforms/widgets/core.py | 8 ++++++--
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/CHANGES.rst b/CHANGES.rst
index d233e927..d479b416 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -9,6 +9,9 @@ Unreleased
   dutch, kazakh, swedish, turkish, slovak, ukranian, spanish, french.
 - Move the repository to the pallets-eco organization.
 - Stop supporting Python 3.9 and start supporting Python 3.13 :pr:`855`
+- Removed `required` flag support from :class:`~fields.HiddenWidget`,
+  :class:`~fields.RangeWidget` and :class:`~fields.SelectWidget` to
+  conform to W3C :pr:`810`
 
 Version 3.1.2
 -------------
@@ -32,7 +35,6 @@ Released 2023-11-01
 - Restored support for 3-items tuple return value from `iter_choices`
   :pr:`816`
 
-
 Version 3.1.0
 -------------
 
diff --git a/src/wtforms/widgets/core.py b/src/wtforms/widgets/core.py
index 772cd8e8..bfa3c0e1 100644
--- a/src/wtforms/widgets/core.py
+++ b/src/wtforms/widgets/core.py
@@ -163,7 +163,6 @@ class Input:
     """
 
     html_params = staticmethod(html_params)
-    validation_attrs = ["required", "disabled"]
 
     def __init__(self, input_type=None):
         if input_type is not None:
@@ -232,6 +231,7 @@ class HiddenInput(Input):
     """
 
     input_type = "hidden"
+    validation_attrs = ["disabled"]
 
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
@@ -246,6 +246,7 @@ class CheckboxInput(Input):
     """
 
     input_type = "checkbox"
+    validation_attrs = ["required", "disabled"]
 
     def __call__(self, field, **kwargs):
         if getattr(field, "checked", field.data):
@@ -262,6 +263,7 @@ class RadioInput(Input):
     """
 
     input_type = "radio"
+    validation_attrs = ["required", "disabled"]
 
     def __call__(self, field, **kwargs):
         if field.checked:
@@ -301,6 +303,7 @@ class SubmitInput(Input):
     """
 
     input_type = "submit"
+    validation_attrs = ["required", "disabled"]
 
     def __call__(self, field, **kwargs):
         kwargs.setdefault("value", field.label.text)
@@ -568,7 +571,7 @@ class RangeInput(Input):
     """
 
     input_type = "range"
-    validation_attrs = ["required", "disabled", "max", "min", "step"]
+    validation_attrs = ["disabled", "max", "min", "step"]
 
     def __init__(self, step=None):
         self.step = step
@@ -585,3 +588,4 @@ class ColorInput(Input):
     """
 
     input_type = "color"
+    validation_attrs = ["disabled"]