diff --git a/django/core/validators.py b/django/core/validators.py
index 94ec34ea03..852ff49358 100644
--- a/django/core/validators.py
+++ b/django/core/validators.py
@@ -104,8 +104,6 @@ class URLValidator(RegexValidator):
         r'\Z', re.IGNORECASE)
     message = _('Enter a valid URL.')
     schemes = ['http', 'https', 'ftp', 'ftps']
-    unsafe_chars = frozenset('\t\r\n')
-    max_length = 2048
 
     def __init__(self, schemes=None, **kwargs):
         super(URLValidator, self).__init__(**kwargs)
@@ -114,10 +112,6 @@ class URLValidator(RegexValidator):
 
     def __call__(self, value):
         value = force_text(value)
-        if not isinstance(value, str) or len(value) > self.max_length:
-            raise ValidationError(self.message, code=self.code, params={'value': value})
-        if self.unsafe_chars.intersection(value):
-            raise ValidationError(self.message, code=self.code)
         # Check first if the scheme is valid
         scheme = value.split('://')[0].lower()
         if scheme not in self.schemes:
@@ -189,9 +183,7 @@ class EmailValidator(object):
     def __call__(self, value):
         value = force_text(value)
 
-        # The maximum length of an email is 320 characters per RFC 3696
-        # section 3.
-        if not value or '@' not in value or len(value) > 320:
+        if not value or '@' not in value:
             raise ValidationError(self.message, code=self.code)
 
         user_part, domain_part = value.rsplit('@', 1)
diff --git a/django/db/backends/sqlite3/schema.py b/django/db/backends/sqlite3/schema.py
index d7e10d817e..9d9eb3c3ba 100644
--- a/django/db/backends/sqlite3/schema.py
+++ b/django/db/backends/sqlite3/schema.py
@@ -24,12 +24,10 @@ class DatabaseSchemaEditor(BaseDatabaseSchemaEditor):
             c.execute('PRAGMA foreign_keys')
             self._initial_pragma_fk = c.fetchone()[0]
             c.execute('PRAGMA foreign_keys = 0')
-        self.connection.cursor().execute('PRAGMA legacy_alter_table = ON')
         return super(DatabaseSchemaEditor, self).__enter__()
 
     def __exit__(self, exc_type, exc_value, traceback):
         super(DatabaseSchemaEditor, self).__exit__(exc_type, exc_value, traceback)
-        self.connection.cursor().execute('PRAGMA legacy_alter_table = OFF')
         with self.connection.cursor() as c:
             # Restore initial FK setting - PRAGMA values can't be parametrized
             c.execute('PRAGMA foreign_keys = %s' % int(self._initial_pragma_fk))
diff --git a/django/forms/fields.py b/django/forms/fields.py
index d5040bc376..e59cf81890 100644
--- a/django/forms/fields.py
+++ b/django/forms/fields.py
@@ -546,12 +546,6 @@ class EmailField(CharField):
     widget = EmailInput
     default_validators = [validators.validate_email]
 
-    def __init__(self, *args, **kwargs):
-        # The default maximum length of an email is 320 characters per RFC 3696
-        # section 3.
-        kwargs.setdefault("max_length", 320)
-        super(EmailField, self).__init__(*args, strip=True, **kwargs)
-
     def clean(self, value):
         value = self.to_python(value).strip()
         return super(EmailField, self).clean(value)
diff --git a/tests/forms_tests/tests/test_fields.py b/tests/forms_tests/tests/test_fields.py
index 93b078bb6e..17b8756ddb 100644
--- a/tests/forms_tests/tests/test_fields.py
+++ b/tests/forms_tests/tests/test_fields.py
@@ -805,10 +805,7 @@ class FieldsTests(SimpleTestCase):
 
     def test_emailfield_1(self):
         f = EmailField()
-        self.assertEqual(f.max_length, 320)
-        self.assertWidgetRendersTo(
-            f, '<input type="email" name="f" id="id_f" maxlength="320" required>'
-        )
+        self.assertWidgetRendersTo(f, '<input type="email" name="f" id="id_f" />')
         self.assertRaisesMessage(ValidationError, "'This field is required.'", f.clean, '')
         self.assertRaisesMessage(ValidationError, "'This field is required.'", f.clean, None)
         self.assertEqual('person@example.com', f.clean('person@example.com'))
diff --git a/tests/forms_tests/tests/test_forms.py b/tests/forms_tests/tests/test_forms.py
index dd3c6b7682..6492b1eda0 100644
--- a/tests/forms_tests/tests/test_forms.py
+++ b/tests/forms_tests/tests/test_forms.py
@@ -416,17 +416,11 @@ class FormsTestCase(SimpleTestCase):
             get_spam = BooleanField()
 
         f = SignupForm(auto_id=False)
-        self.assertHTMLEqual(
-            str(f["email"]),
-            '<input type="email" name="email" maxlength="320" required />',
-        )
+        self.assertHTMLEqual(str(f['email']), '<input type="email" name="email" />')
         self.assertHTMLEqual(str(f['get_spam']), '<input type="checkbox" name="get_spam" />')
 
         f = SignupForm({'email': 'test@example.com', 'get_spam': True}, auto_id=False)
-        self.assertHTMLEqual(
-            str(f["email"]),
-            '<input type="email" name="email" maxlength="320" required />',
-        )
+        self.assertHTMLEqual(str(f['email']), '<input type="email" name="email" value="test@example.com" />')
         self.assertHTMLEqual(str(f['get_spam']), '<input checked="checked" type="checkbox" name="get_spam" />')
 
         # 'True' or 'true' should be rendered without a value attribute
@@ -2601,7 +2595,7 @@ Good luck picking a username that doesn&#39;t already exist.</p>
 <option value="2">Yes</option>
 <option value="3">No</option>
 </select></li>
-<li><label for="id_email">Email:</label> <input type="email" name="email" id="id_email" maxlength="320" /></li>
+<li><label for="id_email">Email:</label> <input type="email" name="email" id="id_email" /></li>
 <li class="required error"><ul class="errorlist"><li>This field is required.</li></ul>
 <label class="required" for="id_age">Age:</label> <input type="number" name="age" id="id_age" /></li>"""
         )
@@ -2617,7 +2611,7 @@ Good luck picking a username that doesn&#39;t already exist.</p>
 <option value="2">Yes</option>
 <option value="3">No</option>
 </select></p>
-<p><label for="id_email">Email:</label> <input type="email" name="email" id="id_email" maxlength="320" /></p>
+<p><label for="id_email">Email:</label> <input type="email" name="email" id="id_email" /></p>
 <ul class="errorlist"><li>This field is required.</li></ul>
 <p class="required error"><label class="required" for="id_age">Age:</label>
 <input type="number" name="age" id="id_age" /></p>"""
@@ -2636,7 +2630,7 @@ Good luck picking a username that doesn&#39;t already exist.</p>
 <option value="3">No</option>
 </select></td></tr>
 <tr><th><label for="id_email">Email:</label></th><td>
-<input type="email" name="email" id="id_email" maxlength="320" /></td></tr>
+<input type="email" name="email" id="id_email" /></td></tr>
 <tr class="required error"><th><label class="required" for="id_age">Age:</label></th>
 <td><ul class="errorlist"><li>This field is required.</li></ul>
 <input type="number" name="age" id="id_age" /></td></tr>"""
@@ -3222,7 +3216,7 @@ Good luck picking a username that doesn&#39;t already exist.</p>
         f = CommentForm(data, auto_id=False, error_class=DivErrorList)
         self.assertHTMLEqual(f.as_p(), """<p>Name: <input type="text" name="name" maxlength="50" /></p>
 <div class="errorlist"><div class="error">Enter a valid email address.</div></div>
-<p>Email: <input type="email" name="email" value="invalid" maxlength="320" required /></p>
+<p>Email: <input type="email" name="email" value="invalid" /></p>
 <div class="errorlist"><div class="error">This field is required.</div></div>
 <p>Comment: <input type="text" name="comment" /></p>""")
 
diff --git a/tests/requests/tests.py b/tests/requests/tests.py
index 8deecd5c7c..772ddc51f7 100644
--- a/tests/requests/tests.py
+++ b/tests/requests/tests.py
@@ -192,13 +192,11 @@ class RequestsTests(SimpleTestCase):
         "Cookie will expire when an distant expiration time is provided"
         response = HttpResponse()
         response.set_cookie('datetime', expires=datetime(2028, 1, 1, 4, 5, 6))
-        response.set_cookie('datetime', expires=datetime(2038, 1, 1, 4, 5, 6))
         datetime_cookie = response.cookies['datetime']
         self.assertIn(
             datetime_cookie['expires'],
             # Slight time dependency; refs #23450
             ('Sat, 01-Jan-2028 04:05:06 GMT', 'Sat, 01-Jan-2028 04:05:07 GMT')
-            ('Fri, 01-Jan-2038 04:05:06 GMT', 'Fri, 01-Jan-2038 04:05:07 GMT')
         )
 
     def test_max_age_expiration(self):
diff --git a/tests/validators/tests.py b/tests/validators/tests.py
index 6e774cedd7..f696f8e573 100644
--- a/tests/validators/tests.py
+++ b/tests/validators/tests.py
@@ -54,7 +54,6 @@ TEST_DATA = [
 
     (validate_email, 'example@atm.%s' % ('a' * 64), ValidationError),
     (validate_email, 'example@%s.atm.%s' % ('b' * 64, 'a' * 63), ValidationError),
-    (validate_email, "example@%scom" % (("a" * 63 + ".") * 100), ValidationError),
     (validate_email, None, ValidationError),
     (validate_email, '', ValidationError),
     (validate_email, 'abc', ValidationError),
@@ -208,11 +207,6 @@ TEST_DATA = [
     (URLValidator(EXTENDED_SCHEMES), 'git://example.com/', None),
 
     (URLValidator(EXTENDED_SCHEMES), 'git://-invalid.com', ValidationError),
-    (
-        URLValidator(),
-        "http://example." + ("a" * 63 + ".") * 1000 + "com",
-        ValidationError,
-    ),
     # Trailing newlines not accepted
     (URLValidator(), 'http://www.djangoproject.com/\n', ValidationError),
     (URLValidator(), 'http://[::ffff:192.9.5.5]\n', ValidationError),