diff --git a/Lib/test/test_tkinter/test_misc.py b/Lib/test/test_tkinter/test_misc.py
index b0b9ed60040443..579ce2af9fa0bf 100644
--- a/Lib/test/test_tkinter/test_misc.py
+++ b/Lib/test/test_tkinter/test_misc.py
@@ -66,9 +66,10 @@ def test_tk_busy(self):
         f.tk_busy_forget()
         self.assertFalse(f.tk_busy_status())
         self.assertFalse(f.tk_busy_current())
-        with self.assertRaisesRegex(TclError, "can't find busy window"):
+        errmsg = r"can(no|')t find busy window.*"
+        with self.assertRaisesRegex(TclError, errmsg):
             f.tk_busy_configure()
-        with self.assertRaisesRegex(TclError, "can't find busy window"):
+        with self.assertRaisesRegex(TclError, errmsg):
             f.tk_busy_forget()
 
     @requires_tk(8, 6, 6)
@@ -87,7 +88,8 @@ def test_tk_busy_with_cursor(self):
         self.assertEqual(f.tk_busy_configure('cursor')[4], 'heart')
 
         f.tk_busy_forget()
-        with self.assertRaisesRegex(TclError, "can't find busy window"):
+        errmsg = r"can(no|')t find busy window.*"
+        with self.assertRaisesRegex(TclError, errmsg):
             f.tk_busy_cget('cursor')
 
     def test_tk_setPalette(self):
diff --git a/Lib/test/test_tkinter/test_widgets.py b/Lib/test/test_tkinter/test_widgets.py
index 9ea764ca2a39d8..f6e77973061956 100644
--- a/Lib/test/test_tkinter/test_widgets.py
+++ b/Lib/test/test_tkinter/test_widgets.py
@@ -7,9 +7,13 @@
 from test.test_tkinter.support import (requires_tk, tk_version,
                                   get_tk_patchlevel, widget_eq,
                                   AbstractDefaultRootTest)
+
 from test.test_tkinter.widget_tests import (
-    add_standard_options,
-    AbstractWidgetTest, StandardOptionsTests, IntegerSizeTests, PixelSizeTests)
+    add_configure_tests,
+    AbstractWidgetTest,
+    StandardOptionsTests,
+    IntegerSizeTests,
+    PixelSizeTests)
 
 requires('gui')
 
@@ -20,9 +24,17 @@
 def float_round(x):
     return float(round(x))
 
-
 class AbstractToplevelTest(AbstractWidgetTest, PixelSizeTests):
-    _conv_pad_pixels = False
+    if tk_version < (9, 0):
+        _no_round = {'padx', 'pady'}
+    else:
+        _no_round = {'borderwidth', 'height', 'highlightthickness', 'padx',
+                     'pady', 'width'}
+    if tk_version < (9, 0):
+        _clipped = {'highlightthickness'}
+    else:
+        _clipped = {'borderwidth', 'height', 'highlightthickness', 'padx',
+                    'pady', 'width'}
 
     def test_configure_class(self):
         widget = self.create()
@@ -58,7 +70,7 @@ def test_configure_visual(self):
         self.assertEqual(widget2['visual'], 'default')
 
 
-@add_standard_options(StandardOptionsTests)
+@add_configure_tests(StandardOptionsTests)
 class ToplevelTest(AbstractToplevelTest, unittest.TestCase):
     OPTIONS = (
         'background', 'backgroundimage', 'borderwidth',
@@ -101,7 +113,7 @@ def test_configure_use(self):
             self.assertEqual(widget2['use'], wid)
 
 
-@add_standard_options(StandardOptionsTests)
+@add_configure_tests(StandardOptionsTests)
 class FrameTest(AbstractToplevelTest, unittest.TestCase):
     OPTIONS = (
         'background', 'backgroundimage', 'borderwidth',
@@ -109,12 +121,17 @@ class FrameTest(AbstractToplevelTest, unittest.TestCase):
         'highlightbackground', 'highlightcolor', 'highlightthickness',
         'padx', 'pady', 'relief', 'takefocus', 'tile', 'visual', 'width',
     )
+    if tk_version < (9, 0):
+        _no_round = {'padx', 'pady'}
+    else:
+        _no_round = {'borderwidth', 'height', 'highlightthickness', 'padx',
+                     'pady', 'width'}
 
     def create(self, **kwargs):
         return tkinter.Frame(self.root, **kwargs)
 
 
-@add_standard_options(StandardOptionsTests)
+@add_configure_tests(StandardOptionsTests)
 class LabelFrameTest(AbstractToplevelTest, unittest.TestCase):
     OPTIONS = (
         'background', 'borderwidth',
@@ -124,6 +141,11 @@ class LabelFrameTest(AbstractToplevelTest, unittest.TestCase):
         'labelanchor', 'labelwidget', 'padx', 'pady', 'relief',
         'takefocus', 'text', 'visual', 'width',
     )
+    if tk_version < (9, 0):
+        _no_round = {'padx', 'pady'}
+    else:
+        _no_round = {'borderwidth', 'height', 'highlightthickness', 'padx',
+                     'pady', 'width'}
 
     def create(self, **kwargs):
         return tkinter.LabelFrame(self.root, **kwargs)
@@ -141,15 +163,16 @@ def test_configure_labelwidget(self):
         self.checkParam(widget, 'labelwidget', label, expected='.foo')
         label.destroy()
 
-
+# Label, Button, Checkbutton, Radiobutton, MenuButton
 class AbstractLabelTest(AbstractWidgetTest, IntegerSizeTests):
-    _conv_pixels = False
-    _clip_highlightthickness = tk_version >= (8, 7)
-    _clip_pad = tk_version >= (8, 7)
-    _clip_borderwidth = tk_version >= (8, 7)
-
-
-@add_standard_options(StandardOptionsTests)
+    _rounds_pixels = False
+    if tk_version < (9, 0):
+        _clipped = {}
+    else:
+        _clipped = {'borderwidth', 'insertborderwidth', 'highlightthickness',
+                    'padx', 'pady'}
+
+@add_configure_tests(StandardOptionsTests)
 class LabelTest(AbstractLabelTest, unittest.TestCase):
     OPTIONS = (
         'activebackground', 'activeforeground', 'anchor',
@@ -165,7 +188,7 @@ def create(self, **kwargs):
         return tkinter.Label(self.root, **kwargs)
 
 
-@add_standard_options(StandardOptionsTests)
+@add_configure_tests(StandardOptionsTests)
 class ButtonTest(AbstractLabelTest, unittest.TestCase):
     OPTIONS = (
         'activebackground', 'activeforeground', 'anchor',
@@ -186,7 +209,7 @@ def test_configure_default(self):
         self.checkEnumParam(widget, 'default', 'active', 'disabled', 'normal')
 
 
-@add_standard_options(StandardOptionsTests)
+@add_configure_tests(StandardOptionsTests)
 class CheckbuttonTest(AbstractLabelTest, unittest.TestCase):
     OPTIONS = (
         'activebackground', 'activeforeground', 'anchor',
@@ -240,8 +263,7 @@ def test_same_name(self):
         b2.deselect()
         self.assertEqual(v.get(), 0)
 
-
-@add_standard_options(StandardOptionsTests)
+@add_configure_tests(StandardOptionsTests)
 class RadiobuttonTest(AbstractLabelTest, unittest.TestCase):
     OPTIONS = (
         'activebackground', 'activeforeground', 'anchor',
@@ -264,7 +286,7 @@ def test_configure_value(self):
         self.checkParams(widget, 'value', 1, 2.3, '', 'any string')
 
 
-@add_standard_options(StandardOptionsTests)
+@add_configure_tests(StandardOptionsTests)
 class MenubuttonTest(AbstractLabelTest, unittest.TestCase):
     OPTIONS = (
         'activebackground', 'activeforeground', 'anchor',
@@ -277,10 +299,11 @@ class MenubuttonTest(AbstractLabelTest, unittest.TestCase):
         'takefocus', 'text', 'textvariable',
         'underline', 'width', 'wraplength',
     )
-    _conv_pixels = round
-    _clip_highlightthickness = True
-    _clip_pad = True
-    _clip_borderwidth = False
+    _rounds_pixels = (tk_version < (9, 0))
+    if tk_version < (9, 0):
+        _clipped = {'highlightthickness', 'padx', 'pady'}
+    else:
+        _clipped ={ 'insertborderwidth', 'highlightthickness', 'padx', 'pady'}
 
     def create(self, **kwargs):
         return tkinter.Menubutton(self.root, **kwargs)
@@ -298,7 +321,10 @@ def test_configure_image(self):
         widget = self.create()
         image = tkinter.PhotoImage(master=self.root, name='image1')
         self.checkParam(widget, 'image', image, conv=str)
-        errmsg = 'image "spam" doesn\'t exist'
+        if tk_version < (9, 0):
+            errmsg = 'image "spam" doesn\'t exist'
+        else:
+            errmsg = 'image "spam" does not exist'
         with self.assertRaises(tkinter.TclError) as cm:
             widget['image'] = 'spam'
         if errmsg is not None:
@@ -328,9 +354,15 @@ def test_bad_kwarg(self):
         with self.assertRaisesRegex(TclError, r"^unknown option -image$"):
             tkinter.OptionMenu(self.root, None, 'b', image='')
 
-
-@add_standard_options(IntegerSizeTests, StandardOptionsTests)
+@add_configure_tests(IntegerSizeTests, StandardOptionsTests)
 class EntryTest(AbstractWidgetTest, unittest.TestCase):
+    _rounds_pixels = (tk_version < (9, 0))
+    if tk_version < (9, 0):
+        _clipped = {'highlightthickness'}
+    else:
+        _clipped = {'highlightthickness', 'borderwidth', 'insertborderwidth',
+                    'selectborderwidth'}
+
     OPTIONS = (
         'background', 'borderwidth', 'cursor',
         'disabledbackground', 'disabledforeground',
@@ -355,16 +387,23 @@ def test_configure_disabledbackground(self):
     def test_configure_insertborderwidth(self):
         widget = self.create(insertwidth=100)
         self.checkPixelsParam(widget, 'insertborderwidth',
-                              0, 1.3, 2.6, 6, -2, '10p')
+                              0, 1.3, 2.6, 6, '10p')
+        self.checkParam(widget, 'insertborderwidth', -2)
         # insertborderwidth is bounded above by a half of insertwidth.
-        self.checkParam(widget, 'insertborderwidth', 60, expected=100//2)
+        expected =  100 // 2 if tk_version < (9, 0) else 60
+        self.checkParam(widget, 'insertborderwidth', 60, expected=expected)
 
     def test_configure_insertwidth(self):
         widget = self.create()
         self.checkPixelsParam(widget, 'insertwidth', 1.3, 3.6, '10p')
-        self.checkParam(widget, 'insertwidth', 0.1, expected=2)
-        self.checkParam(widget, 'insertwidth', -2, expected=2)
-        self.checkParam(widget, 'insertwidth', 0.9, expected=1)
+        if tk_version < (9, 0):
+            self.checkParam(widget, 'insertwidth', 0.1, expected=2)
+            self.checkParam(widget, 'insertwidth', -2, expected=2)
+            self.checkParam(widget, 'insertwidth', 0.9, expected=1)
+        else:
+            self.checkParam(widget, 'insertwidth', 0.1)
+            self.checkParam(widget, 'insertwidth', -2, expected=0)
+            self.checkParam(widget, 'insertwidth', 0.9)
 
     def test_configure_invalidcommand(self):
         widget = self.create()
@@ -422,7 +461,7 @@ def test_selection_methods(self):
         widget.selection_adjust(0)
 
 
-@add_standard_options(StandardOptionsTests)
+@add_configure_tests(StandardOptionsTests)
 class SpinboxTest(EntryTest, unittest.TestCase):
     OPTIONS = (
         'activebackground', 'background', 'borderwidth',
@@ -559,7 +598,7 @@ def test_selection_element(self):
         self.assertEqual(widget.selection_element(), "buttondown")
 
 
-@add_standard_options(StandardOptionsTests)
+@add_configure_tests(StandardOptionsTests)
 class TextTest(AbstractWidgetTest, unittest.TestCase):
     OPTIONS = (
         'autoseparators', 'background', 'blockcursor', 'borderwidth',
@@ -574,6 +613,9 @@ class TextTest(AbstractWidgetTest, unittest.TestCase):
         'tabs', 'tabstyle', 'takefocus', 'undo', 'width', 'wrap',
         'xscrollcommand', 'yscrollcommand',
     )
+    _rounds_pixels = (tk_version < (9, 0))
+    _no_round = {'selectborderwidth'}
+    _clipped = {'highlightthickness'}
 
     def create(self, **kwargs):
         return tkinter.Text(self.root, **kwargs)
@@ -602,8 +644,10 @@ def test_configure_endline(self):
     def test_configure_height(self):
         widget = self.create()
         self.checkPixelsParam(widget, 'height', 100, 101.2, 102.6, '3c')
-        self.checkParam(widget, 'height', -100, expected=1)
-        self.checkParam(widget, 'height', 0, expected=1)
+        self.checkParam(widget, 'height', -100,
+                            expected=1 if tk_version < (9, 0) else -100)
+        self.checkParam(widget, 'height', 0,
+                            expected=1 if tk_version < (9, 0) else 0 )
 
     def test_configure_maxundo(self):
         widget = self.create()
@@ -696,7 +740,7 @@ def test_bbox(self):
         self.assertRaises(TypeError, widget.bbox, '1.1', 'end')
 
 
-@add_standard_options(PixelSizeTests, StandardOptionsTests)
+@add_configure_tests(PixelSizeTests, StandardOptionsTests)
 class CanvasTest(AbstractWidgetTest, unittest.TestCase):
     OPTIONS = (
         'background', 'borderwidth',
@@ -710,8 +754,15 @@ class CanvasTest(AbstractWidgetTest, unittest.TestCase):
         'xscrollcommand', 'xscrollincrement',
         'yscrollcommand', 'yscrollincrement', 'width',
     )
-
-    _conv_pixels = round
+    _rounds_pixels = True
+    if tk_version < (9, 0):
+        _noround = {}
+        _clipped = {'highlightthickness'}
+    else:
+        _no_round = {'borderwidth', 'height', 'highlightthickness', 'width',
+                     'xscrollincrement', 'yscrollincrement'}
+        _clipped = {'borderwidth', 'height', 'highlightthickness', 'width',
+                    'xscrollincrement', 'yscrollincrement'}
     _stringify = True
 
     def create(self, **kwargs):
@@ -953,7 +1004,7 @@ def test_moveto(self):
         self.assertEqual(y2_2 - y1_2, y2_3 - y1_3)
 
 
-@add_standard_options(IntegerSizeTests, StandardOptionsTests)
+@add_configure_tests(IntegerSizeTests, StandardOptionsTests)
 class ListboxTest(AbstractWidgetTest, unittest.TestCase):
     OPTIONS = (
         'activestyle', 'background', 'borderwidth', 'cursor',
@@ -965,6 +1016,11 @@ class ListboxTest(AbstractWidgetTest, unittest.TestCase):
         'selectmode', 'setgrid', 'state',
         'takefocus', 'width', 'xscrollcommand', 'yscrollcommand',
     )
+    _rounds_pixels = (tk_version < (9, 0))
+    if tk_version < (9, 0):
+        _clipped = {'highlightthickness'}
+    else:
+        _clipped = { 'borderwidth', 'highlightthickness', 'selectborderwidth'}
 
     def create(self, **kwargs):
         return tkinter.Listbox(self.root, **kwargs)
@@ -1091,7 +1147,7 @@ def test_get(self):
         self.assertRaises(TclError, lb.get, 2.4)
 
 
-@add_standard_options(PixelSizeTests, StandardOptionsTests)
+@add_configure_tests(PixelSizeTests, StandardOptionsTests)
 class ScaleTest(AbstractWidgetTest, unittest.TestCase):
     OPTIONS = (
         'activebackground', 'background', 'bigincrement', 'borderwidth',
@@ -1102,6 +1158,8 @@ class ScaleTest(AbstractWidgetTest, unittest.TestCase):
         'resolution', 'showvalue', 'sliderlength', 'sliderrelief', 'state',
         'takefocus', 'tickinterval', 'to', 'troughcolor', 'variable', 'width',
     )
+    _rounds_pixels = (tk_version < (9, 0))
+    _clipped = {'highlightthickness'}
     default_orient = 'vertical'
 
     def create(self, **kwargs):
@@ -1159,7 +1217,7 @@ def test_configure_to(self):
                              conv=float_round)
 
 
-@add_standard_options(PixelSizeTests, StandardOptionsTests)
+@add_configure_tests(PixelSizeTests, StandardOptionsTests)
 class ScrollbarTest(AbstractWidgetTest, unittest.TestCase):
     OPTIONS = (
         'activebackground', 'activerelief',
@@ -1170,7 +1228,14 @@ class ScrollbarTest(AbstractWidgetTest, unittest.TestCase):
         'repeatdelay', 'repeatinterval',
         'takefocus', 'troughcolor', 'width',
     )
-    _conv_pixels = round
+    _rounds_pixels = True
+    if tk_version >= (9, 0):
+        _no_round = {'borderwidth', 'elementborderwidth', 'highlightthickness',
+                     'width'}
+    if tk_version < (9, 0):
+        _clipped = {'highlightthickness'}
+    else:
+        _clipped = {'borderwidth', 'highlightthickness', 'width'}
     _stringify = True
     default_orient = 'vertical'
 
@@ -1208,7 +1273,7 @@ def test_set(self):
         self.assertRaises(TypeError, sb.set, 0.6, 0.7, 0.8)
 
 
-@add_standard_options(StandardOptionsTests)
+@add_configure_tests(StandardOptionsTests)
 class PanedWindowTest(AbstractWidgetTest, unittest.TestCase):
     OPTIONS = (
         'background', 'borderwidth', 'cursor',
@@ -1219,6 +1284,15 @@ class PanedWindowTest(AbstractWidgetTest, unittest.TestCase):
         'sashcursor', 'sashpad', 'sashrelief', 'sashwidth',
         'showhandle', 'width',
     )
+    _rounds_pixels = True
+    if tk_version < (9, 0):
+        _no_round = {'handlesize', 'height', 'proxyborderwidth', 'sashwidth',
+                     'selectborderwidth', 'width'}
+    else:
+        _no_round = {'borderwidth', 'handlepad', 'handlesize', 'height',
+                     'proxyborderwidth', 'sashpad', 'sashwidth',
+                     'selectborderwidth', 'width'}
+    _clipped = {}
     default_orient = 'horizontal'
 
     def create(self, **kwargs):
@@ -1347,13 +1421,13 @@ def test_paneconfigure_minsize(self):
 
     def test_paneconfigure_padx(self):
         p, b, c = self.create2()
-        self.check_paneconfigure(p, b, 'padx', 1.3, 1)
+        self.check_paneconfigure(p, b, 'padx', 1.3, 1 if tk_version < (9, 0) else 1.3)
         self.check_paneconfigure_bad(p, b, 'padx',
                 EXPECTED_SCREEN_DISTANCE_ERRMSG.format('badValue'))
 
     def test_paneconfigure_pady(self):
         p, b, c = self.create2()
-        self.check_paneconfigure(p, b, 'pady', 1.3, 1)
+        self.check_paneconfigure(p, b, 'pady', 1.3, 1 if tk_version < (9, 0) else 1.3)
         self.check_paneconfigure_bad(p, b, 'pady',
                 EXPECTED_SCREEN_DISTANCE_ERRMSG.format('badValue'))
 
@@ -1379,17 +1453,17 @@ def test_paneconfigure_width(self):
                 EXPECTED_SCREEN_DISTANCE_OR_EMPTY_ERRMSG.format('badValue'))
 
 
-@add_standard_options(StandardOptionsTests)
+@add_configure_tests(StandardOptionsTests)
 class MenuTest(AbstractWidgetTest, unittest.TestCase):
     OPTIONS = (
         'activebackground', 'activeborderwidth', 'activeforeground',
-        'activerelief',
-        'background', 'borderwidth', 'cursor',
+        'activerelief', 'background', 'borderwidth', 'cursor',
         'disabledforeground', 'font', 'foreground',
         'postcommand', 'relief', 'selectcolor', 'takefocus',
         'tearoff', 'tearoffcommand', 'title', 'type',
     )
-    _conv_pixels = False
+    _rounds_pixels = False
+    _clipped = {}
 
     def create(self, **kwargs):
         return tkinter.Menu(self.root, **kwargs)
@@ -1458,7 +1532,7 @@ def test_entryconfigure_variable(self):
         self.assertEqual(str(m1.entrycget(1, 'variable')), str(v2))
 
 
-@add_standard_options(PixelSizeTests, StandardOptionsTests)
+@add_configure_tests(PixelSizeTests, StandardOptionsTests)
 class MessageTest(AbstractWidgetTest, unittest.TestCase):
     OPTIONS = (
         'anchor', 'aspect', 'background', 'borderwidth',
@@ -1467,11 +1541,12 @@ class MessageTest(AbstractWidgetTest, unittest.TestCase):
         'justify', 'padx', 'pady', 'relief',
         'takefocus', 'text', 'textvariable', 'width',
     )
-    _conv_pad_pixels = False
-    if tk_version >= (8, 7):
-        _conv_pixels = False
-    _clip_pad = tk_version >= (8, 7)
-    _clip_borderwidth = tk_version >= (8, 7)
+    _rounds_pixels = (tk_version < (9, 0))
+    _no_round = {'padx', 'pady'}
+    if tk_version < (9, 0):
+        _clipped = {'highlightthickness'}
+    else:
+        _clipped = {'borderwidth', 'highlightthickness', 'padx', 'pady'}
 
     def create(self, **kwargs):
         return tkinter.Message(self.root, **kwargs)
@@ -1482,16 +1557,14 @@ def test_configure_aspect(self):
 
     def test_configure_padx(self):
         widget = self.create()
-        self.checkPixelsParam(widget, 'padx', 3, 4.4, 5.6, '12m',
-                              conv=self._conv_pad_pixels)
-        expected = self._default_pixels if self._clip_pad else -2
+        self.checkPixelsParam(widget, 'padx', 3, 4.4, 5.6, '12m')
+        expected = -2 if tk_version < (9, 0) else self._default_pixels
         self.checkParam(widget, 'padx', -2, expected=expected)
 
     def test_configure_pady(self):
         widget = self.create()
-        self.checkPixelsParam(widget, 'pady', 3, 4.4, 5.6, '12m',
-                              conv=self._conv_pad_pixels)
-        expected = self._default_pixels if self._clip_pad else -2
+        self.checkPixelsParam(widget, 'pady', 3, 4.4, 5.6, '12m')
+        expected = -2 if tk_version < (9, 0) else self._default_pixels
         self.checkParam(widget, 'pady', -2, expected=expected)
 
     def test_configure_width(self):
diff --git a/Lib/test/test_tkinter/widget_tests.py b/Lib/test/test_tkinter/widget_tests.py
index 8ab2f74245095d..ac7fb5977e04fc 100644
--- a/Lib/test/test_tkinter/widget_tests.py
+++ b/Lib/test/test_tkinter/widget_tests.py
@@ -6,17 +6,16 @@
                                   pixels_conv, tcl_obj_eq)
 import test.support
 
-
 _sentinel = object()
 
+# Options which accept all values allowed by Tk_GetPixels
+# borderwidth = bd
+
 class AbstractWidgetTest(AbstractTkTest):
-    _default_pixels = '' if tk_version >= (9, 0) else -1 if tk_version >= (8, 7) else ''
-    _conv_pixels = round
-    _conv_pad_pixels = None
-    _stringify = False
-    _clip_highlightthickness = True
-    _clip_pad = False
-    _clip_borderwidth = False
+    _default_pixels = ''   # Value for unset pixel options.
+    _rounds_pixels = True  # True if some pixel options are rounded.
+    _no_round = {}         # Pixel options which are not rounded nonetheless
+    _stringify = False     # Whether to convert tuples to strings
     _allow_empty_justify = False
 
     @property
@@ -44,6 +43,9 @@ def checkParam(self, widget, name, value, *, expected=_sentinel,
         widget[name] = value
         if expected is _sentinel:
             expected = value
+        if name in self._clipped:
+            if not isinstance(expected, str):
+                expected = max(expected, 0)
         if conv:
             expected = conv(expected)
         if self._stringify or not self.wantobjects:
@@ -140,14 +142,17 @@ def checkEnumParam(self, widget, name, *values,
             errmsg = 'bad' + errmsg2
         self.checkInvalidParam(widget, name, 'spam', errmsg=errmsg)
 
-    def checkPixelsParam(self, widget, name, *values,
-                         conv=None, **kwargs):
-        if conv is None:
-            conv = self._conv_pixels
+    def checkPixelsParam(self, widget, name, *values, conv=None, **kwargs):
+        if not self._rounds_pixels or name in self._no_round:
+            conv = False
+        elif conv != str:
+            conv = round
         for value in values:
             expected = _sentinel
             conv1 = conv
             if isinstance(value, str):
+                if not getattr(self, '_converts_pixels', True):
+                    conv1 = str
                 if conv1 and conv1 is not str:
                     expected = pixels_conv(value) * self.scaling
                     conv1 = round
@@ -172,8 +177,12 @@ def checkReliefParam(self, widget, name, *, allow_empty=False):
     def checkImageParam(self, widget, name):
         image = tkinter.PhotoImage(master=self.root, name='image1')
         self.checkParam(widget, name, image, conv=str)
+        if tk_version < (9, 0):
+            errmsg = 'image "spam" doesn\'t exist'
+        else:
+            errmsg = 'image "spam" does not exist'
         self.checkInvalidParam(widget, name, 'spam',
-                errmsg='image "spam" doesn\'t exist')
+                               errmsg=errmsg)
         widget[name] = ''
 
     def checkVariableParam(self, widget, name, var):
@@ -215,31 +224,80 @@ def test_keys(self):
                     print('%s.OPTIONS doesn\'t contain "%s"' %
                           (self.__class__.__name__, k))
 
+class PixelOptionsTests:
+    """Standard options that accept all formats acceptable to Tk_GetPixels.
 
-class StandardOptionsTests:
-    STANDARD_OPTIONS = (
-        'activebackground', 'activeborderwidth', 'activeforeground', 'anchor',
-        'background', 'bitmap', 'borderwidth', 'compound', 'cursor',
-        'disabledforeground', 'exportselection', 'font', 'foreground',
-        'highlightbackground', 'highlightcolor', 'highlightthickness',
-        'image', 'insertbackground', 'insertborderwidth',
-        'insertofftime', 'insertontime', 'insertwidth',
-        'jump', 'justify', 'orient', 'padx', 'pady', 'relief',
-        'repeatdelay', 'repeatinterval',
-        'selectbackground', 'selectborderwidth', 'selectforeground',
-        'setgrid', 'takefocus', 'text', 'textvariable', 'troughcolor',
-        'underline', 'wraplength', 'xscrollcommand', 'yscrollcommand',
-    )
-
-    def test_configure_activebackground(self):
-        widget = self.create()
-        self.checkColorParam(widget, 'activebackground')
+    In addition to numbers, these options can be set with distances
+    specified as a string consisting of a number followed by a single
+    character giving the unit of distance. The allowed units are:
+    millimeters ('m'), centimeters ('c'), inches ('i') or points ('p').
+    In Tk 9 a cget call for one of these options returns a Tcl_Obj of
+    type "pixels", whose string representation is the distance string
+    passed to configure.
+    """
+    PIXEL_OPTIONS = ('activeborderwidth', 'borderwidth', 'highlightthickness',
+      'insertborderwidth', 'insertwidth', 'padx', 'pady', 'selectborderwidth')
 
     def test_configure_activeborderwidth(self):
         widget = self.create()
         self.checkPixelsParam(widget, 'activeborderwidth',
                               0, 1.3, 2.9, 6, -2, '10p')
 
+    def test_configure_borderwidth(self):
+        widget = self.create()
+        self.checkPixelsParam(widget, 'borderwidth',
+                              0, 1.3, 2.6, 6, '10p')
+        self.checkParam(widget, 'borderwidth', -2)
+        if 'bd' in self.OPTIONS:
+            self.checkPixelsParam(widget, 'bd', 0, 1.3, 2.6, 6, '10p')
+            self.checkParam(widget, 'bd', -2, expected=expected)
+
+    def test_configure_highlightthickness(self):
+        widget = self.create()
+        self.checkPixelsParam(widget, 'highlightthickness',
+                              0, 1.3, 2.6, 6, '10p')
+        self.checkParam(widget, 'highlightthickness', -2)
+
+    def test_configure_insertborderwidth(self):
+        widget = self.create()
+        self.checkPixelsParam(widget, 'insertborderwidth',
+                              0, 1.3, 2.6, 6, '10p')
+        self.checkParam(widget, 'insertborderwidth', -2)
+
+    def test_configure_insertwidth(self):
+        widget = self.create()
+        self.checkPixelsParam(widget, 'insertwidth', 1.3, 2.6, -2, '10p')
+
+    def test_configure_padx(self):
+        widget = self.create()
+        self.checkPixelsParam(widget, 'padx', 3, 4.4, 5.6, '12m')
+        self.checkParam(widget, 'padx', -2)
+
+    def test_configure_pady(self):
+        widget = self.create()
+        self.checkPixelsParam(widget, 'pady', 3, 4.4, 5.6, '12m')
+        self.checkParam(widget, 'pady', -2)
+
+    def test_configure_selectborderwidth(self):
+        widget = self.create()
+        self.checkPixelsParam(widget, 'selectborderwidth', 1.3, 2.6, -2, '10p')
+
+class StandardOptionsTests(PixelOptionsTests):
+
+    STANDARD_OPTIONS = ( 'activebackground', 'activeforeground',
+    'anchor', 'background', 'bitmap', 'compound', 'cursor',
+    'disabledforeground', 'exportselection', 'font', 'foreground',
+    'highlightbackground', 'highlightcolor', 'image',
+    'insertbackground', 'insertofftime', 'insertontime', 'jump',
+    'justify', 'orient', 'relief', 'repeatdelay', 'repeatinterval',
+    'selectbackground', 'selectforeground', 'setgrid', 'takefocus',
+    'text', 'textvariable', 'troughcolor', 'underline', 'wraplength',
+    'xscrollcommand', 'yscrollcommand', ) + PixelOptionsTests.PIXEL_OPTIONS
+
+    def test_configure_activebackground(self):
+        widget = self.create()
+        self.checkColorParam(widget, 'activebackground')
+
     def test_configure_activeforeground(self):
         widget = self.create()
         self.checkColorParam(widget, 'activeforeground')
@@ -277,18 +335,6 @@ def test_configure_bitmap(self):
             self.checkInvalidParam(widget, 'bitmap', 'spam',
                     errmsg='bitmap "spam" not defined')
 
-    def test_configure_borderwidth(self):
-        widget = self.create()
-        self.checkPixelsParam(widget, 'borderwidth',
-                              0, 1.3, 2.6, 6, '10p')
-        expected = 0 if self._clip_borderwidth else -2
-        self.checkParam(widget, 'borderwidth', -2, expected=expected,
-                        conv=self._conv_pixels)
-        if 'bd' in self.OPTIONS:
-            self.checkPixelsParam(widget, 'bd', 0, 1.3, 2.6, 6, '10p')
-            self.checkParam(widget, 'bd', -2, expected=expected,
-                            conv=self._conv_pixels)
-
     def test_configure_compound(self):
         widget = self.create()
         self.checkEnumParam(widget, 'compound',
@@ -312,8 +358,8 @@ def test_configure_font(self):
                         '-Adobe-Helvetica-Medium-R-Normal--*-120-*-*-*-*-*-*')
         is_ttk = widget.__class__.__module__ == 'tkinter.ttk'
         if not is_ttk:
-            self.checkInvalidParam(widget, 'font', '',
-                                   errmsg='font "" doesn\'t exist')
+            errmsg = 'font "" does ?n[o\']t exist'
+            self.checkInvalidParam(widget, 'font', '', errmsg=errmsg)
 
     def test_configure_foreground(self):
         widget = self.create()
@@ -329,14 +375,6 @@ def test_configure_highlightcolor(self):
         widget = self.create()
         self.checkColorParam(widget, 'highlightcolor')
 
-    def test_configure_highlightthickness(self):
-        widget = self.create()
-        self.checkPixelsParam(widget, 'highlightthickness',
-                              0, 1.3, 2.6, 6, '10p')
-        expected = 0 if self._clip_highlightthickness else -2
-        self.checkParam(widget, 'highlightthickness', -2, expected=expected,
-                        conv=self._conv_pixels)
-
     def test_configure_image(self):
         widget = self.create()
         self.checkImageParam(widget, 'image')
@@ -345,11 +383,6 @@ def test_configure_insertbackground(self):
         widget = self.create()
         self.checkColorParam(widget, 'insertbackground')
 
-    def test_configure_insertborderwidth(self):
-        widget = self.create()
-        self.checkPixelsParam(widget, 'insertborderwidth',
-                              0, 1.3, 2.6, 6, -2, '10p')
-
     def test_configure_insertofftime(self):
         widget = self.create()
         self.checkIntegerParam(widget, 'insertofftime', 100)
@@ -358,10 +391,6 @@ def test_configure_insertontime(self):
         widget = self.create()
         self.checkIntegerParam(widget, 'insertontime', 100)
 
-    def test_configure_insertwidth(self):
-        widget = self.create()
-        self.checkPixelsParam(widget, 'insertwidth', 1.3, 2.6, -2, '10p')
-
     def test_configure_jump(self):
         widget = self.create()
         self.checkBooleanParam(widget, 'jump')
@@ -379,22 +408,6 @@ def test_configure_orient(self):
         self.assertEqual(str(widget['orient']), self.default_orient)
         self.checkEnumParam(widget, 'orient', 'horizontal', 'vertical')
 
-    def test_configure_padx(self):
-        widget = self.create()
-        self.checkPixelsParam(widget, 'padx', 3, 4.4, 5.6, '12m',
-                              conv=self._conv_pad_pixels)
-        expected = 0 if self._clip_pad else -2
-        self.checkParam(widget, 'padx', -2, expected=expected,
-                        conv=self._conv_pad_pixels)
-
-    def test_configure_pady(self):
-        widget = self.create()
-        self.checkPixelsParam(widget, 'pady', 3, 4.4, 5.6, '12m',
-                              conv=self._conv_pad_pixels)
-        expected = 0 if self._clip_pad else -2
-        self.checkParam(widget, 'pady', -2, expected=expected,
-                        conv=self._conv_pad_pixels)
-
     @requires_tk(8, 7)
     def test_configure_placeholder(self):
         widget = self.create()
@@ -421,10 +434,6 @@ def test_configure_selectbackground(self):
         widget = self.create()
         self.checkColorParam(widget, 'selectbackground')
 
-    def test_configure_selectborderwidth(self):
-        widget = self.create()
-        self.checkPixelsParam(widget, 'selectborderwidth', 1.3, 2.6, -2, '10p')
-
     def test_configure_selectforeground(self):
         widget = self.create()
         self.checkColorParam(widget, 'selectforeground')
@@ -534,6 +543,7 @@ def test_configure_variable(self):
 
 
 class IntegerSizeTests:
+    """ Tests widgets which only accept integral width and height."""
     def test_configure_height(self):
         widget = self.create()
         self.checkIntegerParam(widget, 'height', 100, -100, 0)
@@ -544,6 +554,7 @@ def test_configure_width(self):
 
 
 class PixelSizeTests:
+    """ Tests widgets which accept screen distances for width and height."""
     def test_configure_height(self):
         widget = self.create()
         self.checkPixelsParam(widget, 'height', 100, 101.2, 102.6, -100, 0, '3c')
@@ -553,7 +564,7 @@ def test_configure_width(self):
         self.checkPixelsParam(widget, 'width', 402, 403.4, 404.6, -402, 0, '5i')
 
 
-def add_standard_options(*source_classes):
+def add_configure_tests(*source_classes):
     # This decorator adds test_configure_xxx methods from source classes for
     # every xxx option in the OPTIONS class attribute if they are not defined
     # explicitly.
diff --git a/Lib/test/test_ttk/test_style.py b/Lib/test/test_ttk/test_style.py
index eeaf5de2e303f6..19918772514ad4 100644
--- a/Lib/test/test_ttk/test_style.py
+++ b/Lib/test/test_ttk/test_style.py
@@ -205,7 +205,8 @@ def test_element_create_from_errors(self):
         style = self.style
         with self.assertRaises(IndexError):
             style.element_create('plain.newelem', 'from')
-        with self.assertRaisesRegex(TclError, 'theme "spam" doesn\'t exist'):
+        with self.assertRaisesRegex(TclError,
+            'theme "spam" (does not|doesn\'t) exist'):
             style.element_create('plain.newelem', 'from', 'spam')
 
     def test_element_create_image(self):
diff --git a/Lib/test/test_ttk/test_widgets.py b/Lib/test/test_ttk/test_widgets.py
index 10bec33be617a1..d5620becfa7187 100644
--- a/Lib/test/test_ttk/test_widgets.py
+++ b/Lib/test/test_ttk/test_widgets.py
@@ -8,7 +8,7 @@
 from test.test_tkinter.support import (
     AbstractTkTest, requires_tk, tk_version, get_tk_patchlevel,
     simulate_mouse_click, AbstractDefaultRootTest)
-from test.test_tkinter.widget_tests import (add_standard_options,
+from test.test_tkinter.widget_tests import (add_configure_tests,
     AbstractWidgetTest, StandardOptionsTests, IntegerSizeTests, PixelSizeTests)
 
 requires('gui')
@@ -125,10 +125,11 @@ def test_cb(arg1, **kw):
 
 
 class AbstractToplevelTest(AbstractWidgetTest, PixelSizeTests):
-    _conv_pixels = False
+    _rounds_pixels = False
+    _clipped = {}
 
 
-@add_standard_options(StandardTtkOptionsTests)
+@add_configure_tests(StandardTtkOptionsTests)
 class FrameTest(AbstractToplevelTest, unittest.TestCase):
     OPTIONS = (
         'borderwidth', 'class', 'cursor', 'height',
@@ -140,7 +141,7 @@ def create(self, **kwargs):
         return ttk.Frame(self.root, **kwargs)
 
 
-@add_standard_options(StandardTtkOptionsTests)
+@add_configure_tests(StandardTtkOptionsTests)
 class LabelFrameTest(AbstractToplevelTest, unittest.TestCase):
     OPTIONS = (
         'borderwidth', 'class', 'cursor', 'height',
@@ -168,6 +169,8 @@ def test_configure_labelwidget(self):
 
 class AbstractLabelTest(AbstractWidgetTest):
     _allow_empty_justify = True
+    _rounds_pixels = False
+    _clipped = {}
 
     def checkImageParam(self, widget, name):
         image = tkinter.PhotoImage(master=self.root, name='image1')
@@ -179,8 +182,11 @@ def checkImageParam(self, widget, name):
                         expected=('image1', 'active', 'image2'))
         self.checkParam(widget, name, 'image1 active image2',
                         expected=('image1', 'active', 'image2'))
-        self.checkInvalidParam(widget, name, 'spam',
-                errmsg='image "spam" doesn\'t exist')
+        if tk_version < (9, 0):
+            errmsg = 'image "spam" doesn\'t exist'
+        else:
+            errmsg = 'image "spam" does not exist'
+        self.checkInvalidParam(widget, name, 'spam', errmsg=errmsg)
 
     def test_configure_compound(self):
         values = ('none', 'text', 'image', 'center', 'top', 'bottom', 'left', 'right')
@@ -196,7 +202,7 @@ def test_configure_width(self):
         self.checkParams(widget, 'width', 402, -402, 0)
 
 
-@add_standard_options(StandardTtkOptionsTests)
+@add_configure_tests(StandardTtkOptionsTests)
 class LabelTest(AbstractLabelTest, unittest.TestCase):
     OPTIONS = (
         'anchor', 'background', 'borderwidth',
@@ -214,7 +220,7 @@ def create(self, **kwargs):
     test_configure_justify = StandardOptionsTests.test_configure_justify
 
 
-@add_standard_options(StandardTtkOptionsTests)
+@add_configure_tests(StandardTtkOptionsTests)
 class ButtonTest(AbstractLabelTest, unittest.TestCase):
     OPTIONS = (
         'class', 'command', 'compound', 'cursor', 'default',
@@ -239,7 +245,7 @@ def test_invoke(self):
         self.assertTrue(success)
 
 
-@add_standard_options(StandardTtkOptionsTests)
+@add_configure_tests(StandardTtkOptionsTests)
 class CheckbuttonTest(AbstractLabelTest, unittest.TestCase):
     OPTIONS = (
         'class', 'command', 'compound', 'cursor',
@@ -326,7 +332,7 @@ def test_unique_variables2(self):
         self.assertEqual(len(set(variables)), len(buttons), variables)
 
 
-@add_standard_options(IntegerSizeTests, StandardTtkOptionsTests)
+@add_configure_tests(IntegerSizeTests, StandardTtkOptionsTests)
 class EntryTest(AbstractWidgetTest, unittest.TestCase):
     OPTIONS = (
         'background', 'class', 'cursor',
@@ -336,6 +342,8 @@ class EntryTest(AbstractWidgetTest, unittest.TestCase):
         'show', 'state', 'style', 'takefocus', 'textvariable',
         'validate', 'validatecommand', 'width', 'xscrollcommand',
     )
+    _rounds_pixels = False
+    _clipped = {}
     # bpo-27313: macOS Tk/Tcl may or may not report 'Entry.field'.
     IDENTIFY_AS = {'Entry.field', 'textarea'}
 
@@ -371,8 +379,12 @@ def test_bbox(self):
         self.assertRaises(tkinter.TclError, self.entry.bbox, None)
 
     def test_identify(self):
+        if (tk_version >= (9, 0) and sys.platform == 'darwin'
+                and isinstance(self.entry, ttk.Combobox)):
+            self.skipTest('Test does not work on macOS Tk 9.')
+            # https://core.tcl-lang.org/tk/tktview/8b49e9cfa6
         self.entry.pack()
-        self.entry.update()
+        self.root.update()
 
         self.assertIn(self.entry.identify(5, 5), self.IDENTIFY_AS)
         self.assertEqual(self.entry.identify(-1, -1), "")
@@ -450,7 +462,7 @@ def validate(content):
         self.assertEqual(self.entry.state(), ())
 
 
-@add_standard_options(IntegerSizeTests, StandardTtkOptionsTests)
+@add_configure_tests(IntegerSizeTests, StandardTtkOptionsTests)
 class ComboboxTest(EntryTest, unittest.TestCase):
     OPTIONS = (
         'background', 'class', 'cursor', 'exportselection',
@@ -479,11 +491,14 @@ def _show_drop_down_listbox(self):
         x, y = width - 5, 5
         if sys.platform != 'darwin':  # there's no down arrow on macOS
             self.assertRegex(self.combo.identify(x, y), r'.*downarrow\Z')
-        self.combo.event_generate('<ButtonPress-1>', x=x, y=y)
+        self.combo.event_generate('<Button-1>', x=x, y=y)
         self.combo.event_generate('<ButtonRelease-1>', x=x, y=y)
-        self.combo.update_idletasks()
 
     def test_virtual_event(self):
+        if (tk_version >= (9, 0) and sys.platform == 'darwin'
+                and isinstance(self.entry, ttk.Combobox)):
+            self.skipTest('Test does not work on macOS Tk 9.')
+            # https://core.tcl-lang.org/tk/tktview/8b49e9cfa6
         success = []
 
         self.combo['values'] = [1]
@@ -501,6 +516,10 @@ def test_virtual_event(self):
         self.assertTrue(success)
 
     def test_configure_postcommand(self):
+        if (tk_version >= (9, 0) and sys.platform == 'darwin'
+                and isinstance(self.entry, ttk.Combobox)):
+            self.skipTest('Test does not work on macOS Tk 9.')
+            # https://core.tcl-lang.org/tk/tktview/8b49e9cfa6
         success = []
 
         self.combo['postcommand'] = lambda: success.append(True)
@@ -576,12 +595,14 @@ def check_get_current(getval, currval):
         combo2.destroy()
 
 
-@add_standard_options(IntegerSizeTests, StandardTtkOptionsTests)
+@add_configure_tests(IntegerSizeTests, StandardTtkOptionsTests)
 class PanedWindowTest(AbstractWidgetTest, unittest.TestCase):
     OPTIONS = (
         'class', 'cursor', 'height',
         'orient', 'style', 'takefocus', 'width',
     )
+    _rounds_pixels = False
+    _clipped = {}
 
     def setUp(self):
         super().setUp()
@@ -712,7 +733,7 @@ def test_sashpos(self):
         self.assertIsInstance(self.paned.sashpos(0), int)
 
 
-@add_standard_options(StandardTtkOptionsTests)
+@add_configure_tests(StandardTtkOptionsTests)
 class RadiobuttonTest(AbstractLabelTest, unittest.TestCase):
     OPTIONS = (
         'class', 'command', 'compound', 'cursor',
@@ -791,13 +812,14 @@ def test_configure_menu(self):
         menu.destroy()
 
 
-@add_standard_options(StandardTtkOptionsTests)
+@add_configure_tests(StandardTtkOptionsTests)
 class ScaleTest(AbstractWidgetTest, unittest.TestCase):
     OPTIONS = (
         'class', 'command', 'cursor', 'from', 'length',
         'orient', 'state', 'style', 'takefocus', 'to', 'value', 'variable',
     )
-    _conv_pixels = False
+    _rounds_pixels = False
+    _clipped = {}
     default_orient = 'horizontal'
 
     def setUp(self):
@@ -899,7 +921,7 @@ def test_set(self):
         self.assertRaises(tkinter.TclError, self.scale.set, None)
 
 
-@add_standard_options(StandardTtkOptionsTests)
+@add_configure_tests(StandardTtkOptionsTests)
 class ProgressbarTest(AbstractWidgetTest, unittest.TestCase):
     OPTIONS = (
         'anchor', 'class', 'cursor', 'font', 'foreground', 'justify',
@@ -907,7 +929,8 @@ class ProgressbarTest(AbstractWidgetTest, unittest.TestCase):
         'mode', 'maximum', 'phase', 'text', 'wraplength',
         'style', 'takefocus', 'value', 'variable',
     )
-    _conv_pixels = False
+    _rounds_pixels = False
+    _clipped = {}
     _allow_empty_justify = True
     default_orient = 'horizontal'
 
@@ -952,24 +975,27 @@ def test_configure_value(self):
 
 @unittest.skipIf(sys.platform == 'darwin',
                  'ttk.Scrollbar is special on MacOSX')
-@add_standard_options(StandardTtkOptionsTests)
+@add_configure_tests(StandardTtkOptionsTests)
 class ScrollbarTest(AbstractWidgetTest, unittest.TestCase):
     OPTIONS = (
         'class', 'command', 'cursor', 'orient', 'style', 'takefocus',
     )
+    _rounds_pixels = False
+    _clipped = {}
     default_orient = 'vertical'
 
     def create(self, **kwargs):
         return ttk.Scrollbar(self.root, **kwargs)
 
 
-@add_standard_options(StandardTtkOptionsTests)
+@add_configure_tests(StandardTtkOptionsTests)
 class NotebookTest(AbstractWidgetTest, unittest.TestCase):
     OPTIONS = (
         'class', 'cursor', 'height', 'padding', 'style', 'takefocus', 'width',
     )
-    if tk_version >= (8, 7):
-        _conv_pixels = False
+    _rounds_pixels = (tk_version < (9,0))
+    _converts_pixels = False
+    _clipped = {}
 
     def setUp(self):
         super().setUp()
@@ -987,14 +1013,14 @@ def test_configure_height(self):
         if get_tk_patchlevel(self.root) < (8, 6, 15):
             self.checkIntegerParam(widget, 'height', 402, -402, 0)
         else:
-            self.checkPixelsParam(widget, 'height', '10c', 402, -402, 0, conv=False)
+            self.checkPixelsParam(widget, 'height', '10c', 402, -402, 0)
 
     def test_configure_width(self):
         widget = self.create()
         if get_tk_patchlevel(self.root) < (8, 6, 15):
             self.checkIntegerParam(widget, 'width', 402, -402, 0)
         else:
-            self.checkPixelsParam(widget, 'width', '10c', 402, -402, 0, conv=False)
+            self.checkPixelsParam(widget, 'width', '10c', 402, -402, 0)
 
     def test_tab_identifiers(self):
         self.nb.forget(0)
@@ -1160,7 +1186,12 @@ def test_traversal(self):
 
         self.nb.select(0)
 
-        focus_identify_as = 'focus' if sys.platform != 'darwin' else ''
+        if sys.platform == 'darwin':
+            focus_identify_as = ''
+        elif sys.platform == 'win32':
+            focus_identify_as = 'focus'
+        else:
+            focus_identify_as = 'focus' if tk_version < (9,0) else 'padding'
         self.assertEqual(self.nb.identify(5, 5), focus_identify_as)
         simulate_mouse_click(self.nb, 5, 5)
         self.nb.focus_force()
@@ -1193,7 +1224,7 @@ def test_traversal(self):
         self.assertEqual(self.nb.select(), str(self.child2))
 
 
-@add_standard_options(IntegerSizeTests, StandardTtkOptionsTests)
+@add_configure_tests(IntegerSizeTests, StandardTtkOptionsTests)
 class SpinboxTest(EntryTest, unittest.TestCase):
     OPTIONS = (
         'background', 'class', 'command', 'cursor', 'exportselection',
@@ -1370,7 +1401,7 @@ def test_configure_values(self):
         spin2.destroy()
 
 
-@add_standard_options(StandardTtkOptionsTests)
+@add_configure_tests(StandardTtkOptionsTests)
 class TreeviewTest(AbstractWidgetTest, unittest.TestCase):
     OPTIONS = (
         'class', 'columns', 'cursor', 'displaycolumns',
@@ -1378,6 +1409,8 @@ class TreeviewTest(AbstractWidgetTest, unittest.TestCase):
         'style', 'takefocus', 'titlecolumns', 'titleitems',
         'xscrollcommand', 'yscrollcommand',
     )
+    _rounds_pixels = False
+    _clipped = {}
 
     def setUp(self):
         super().setUp()
@@ -1413,8 +1446,10 @@ def test_configure_displaycolumns(self):
 
     def test_configure_height(self):
         widget = self.create()
-        self.checkPixelsParam(widget, 'height', 100, -100, 0, '3c', conv=False)
-        self.checkPixelsParam(widget, 'height', 101.2, 102.6, conv=False)
+        self.checkPixelsParam(widget, 'height', 100, -100, 0, '3c',
+                                  conv=False)
+        self.checkPixelsParam(widget, 'height', 101.2, 102.6, '3c',
+                                  conv=False)
 
     def test_configure_selectmode(self):
         widget = self.create()
@@ -1936,24 +1971,28 @@ def test_tag_has(self):
         self.assertEqual(self.tv.tag_has('tag3'), ())
 
 
-@add_standard_options(StandardTtkOptionsTests)
+@add_configure_tests(StandardTtkOptionsTests)
 class SeparatorTest(AbstractWidgetTest, unittest.TestCase):
     OPTIONS = (
         'class', 'cursor', 'orient', 'style', 'takefocus',
         # 'state'?
     )
+    _rounds_pixels = False
+    _clipped = {}
     default_orient = 'horizontal'
 
     def create(self, **kwargs):
         return ttk.Separator(self.root, **kwargs)
 
 
-@add_standard_options(StandardTtkOptionsTests)
+@add_configure_tests(StandardTtkOptionsTests)
 class SizegripTest(AbstractWidgetTest, unittest.TestCase):
     OPTIONS = (
         'class', 'cursor', 'style', 'takefocus',
         # 'state'?
     )
+    _rounds_pixels = False
+    _clipped = {}
 
     def create(self, **kwargs):
         return ttk.Sizegrip(self.root, **kwargs)
diff --git a/Lib/tkinter/ttk.py b/Lib/tkinter/ttk.py
index 073b3ae20797c3..8ddb7f97e3b233 100644
--- a/Lib/tkinter/ttk.py
+++ b/Lib/tkinter/ttk.py
@@ -321,6 +321,8 @@ def _tclobj_to_py(val):
     elif hasattr(val, 'typename'): # some other (single) Tcl object
         val = _convert_stringval(val)
 
+    if isinstance(val, tuple) and len(val) == 0:
+        return ''
     return val
 
 def tclobjs_to_py(adict):
diff --git a/Misc/NEWS.d/next/Library/2024-09-17-10-38-26.gh-issue-124111.Hd53VN.rst b/Misc/NEWS.d/next/Library/2024-09-17-10-38-26.gh-issue-124111.Hd53VN.rst
new file mode 100644
index 00000000000000..aba082a7ac1ad4
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2024-09-17-10-38-26.gh-issue-124111.Hd53VN.rst
@@ -0,0 +1,4 @@
+The tkinter module can now be built to use either the new version 9.0.0 of
+Tcl/Tk or the latest release 8.6.15 of Tcl/Tk 8.  Tcl/Tk 9 includes many
+improvements, both to the Tcl language and to the appearance and utility of
+the graphical user interface provided by Tk.
diff --git a/Modules/_tkinter.c b/Modules/_tkinter.c
index b0b70ccb8cc3d3..45897817a56051 100644
--- a/Modules/_tkinter.c
+++ b/Modules/_tkinter.c
@@ -325,6 +325,7 @@ typedef struct {
     const Tcl_ObjType *ListType;
     const Tcl_ObjType *StringType;
     const Tcl_ObjType *UTF32StringType;
+    const Tcl_ObjType *PixelType;
 } TkappObject;
 
 #define Tkapp_Interp(v) (((TkappObject *) (v))->interp)
@@ -637,6 +638,7 @@ Tkapp_New(const char *screenName, const char *className,
     v->ListType = Tcl_GetObjType("list");
     v->StringType = Tcl_GetObjType("string");
     v->UTF32StringType = Tcl_GetObjType("utf32string");
+    v->PixelType = Tcl_GetObjType("pixel");
 
     /* Delete the 'exit' command, which can screw things up */
     Tcl_DeleteCommand(v->interp, "exit");
@@ -1236,7 +1238,8 @@ FromObj(TkappObject *tkapp, Tcl_Obj *value)
     }
 
     if (value->typePtr == tkapp->StringType ||
-        value->typePtr == tkapp->UTF32StringType)
+        value->typePtr == tkapp->UTF32StringType ||
+        value->typePtr == tkapp->PixelType)
     {
         return unicodeFromTclObj(tkapp, value);
     }
diff --git a/PCbuild/_tkinter.vcxproj b/PCbuild/_tkinter.vcxproj
index 117488a01621cc..87f6005fffc7c5 100644
--- a/PCbuild/_tkinter.vcxproj
+++ b/PCbuild/_tkinter.vcxproj
@@ -94,6 +94,7 @@
   <ItemDefinitionGroup>
     <ClCompile>
       <AdditionalIncludeDirectories>$(tcltkDir)include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions Condition="$(TclMajorVersion) == '9'">TCL_WITH_EXTERNAL_TOMMATH;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <PreprocessorDefinitions>WITH_APPINIT;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <PreprocessorDefinitions Condition="'$(BuildForRelease)' != 'true'">Py_TCLTK_DIR="$(tcltkDir.TrimEnd('\').Replace('\', '\\'))";%(PreprocessorDefinitions)</PreprocessorDefinitions>
     </ClCompile>
@@ -109,9 +110,10 @@
     <ResourceCompile Include="..\PC\python_nt.rc" />
   </ItemGroup>
   <ItemGroup>
-    <_TclTkDLL Include="$(tcltkdir)\bin\$(tclDllName)" />
-    <_TclTkDLL Include="$(tcltkdir)\bin\$(tkDllName)" />
-    <_TclTkDLL Include="$(tcltkdir)\bin\$(tclZlibDllName)" />
+    <_TclTkDLL Include="$(tcltkdir)\bin\$(tclDLLName)" />
+    <_TclTkDLL Include="$(tcltkdir)\bin\$(tkDLLName)" />
+    <_TclTkDLL Include="$(tcltkdir)\bin\$(tclZlibDLLName)" />
+    <_TclTkDLL Include="$(tcltkdir)\bin\$(tommathDLLName)" Condition="$(tommathDLLName) != ''"/>
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="pythoncore.vcxproj">
@@ -134,4 +136,4 @@
   <Target Name="_CleanTCL_LIBRARY" BeforeTargets="Clean">
     <Delete Files="$(OutDir)TCL_LIBRARY.env" />
   </Target>
-</Project>
\ No newline at end of file
+</Project>
diff --git a/PCbuild/build.bat b/PCbuild/build.bat
index abe649553756a7..6d3ce81651ade5 100644
--- a/PCbuild/build.bat
+++ b/PCbuild/build.bat
@@ -11,7 +11,7 @@ echo.directly to MSBuild may be passed.  If the argument contains an '=', the
 echo.entire argument must be quoted (e.g. `%~nx0 "/p:PlatformToolset=v141"`).
 echo.Alternatively you can put extra flags for MSBuild in a file named 
 echo.`msbuild.rsp` in the `PCbuild` directory, one flag per line. This file
-echo.will be picked automatically by MSBuild. Flags put in this file does not
+echo.will be picked automatically by MSBuild. Flags put in this file do not
 echo.need to be quoted. You can still use environment variables inside the 
 echo.response file.
 echo.
@@ -196,4 +196,4 @@ rem Display the current build version information
 call "%dir%find_msbuild.bat" %MSBUILD%
 if ERRORLEVEL 1 (echo Cannot locate MSBuild.exe on PATH or as MSBUILD variable & exit /b 2)
 %MSBUILD% "%dir%pythoncore.vcxproj" /t:ShowVersionInfo /v:m /nologo %1 %2 %3 %4 %5 %6 %7 %8 %9
-if ERRORLEVEL 1 exit /b 3
\ No newline at end of file
+if ERRORLEVEL 1 exit /b 3
diff --git a/PCbuild/tcltk.props b/PCbuild/tcltk.props
index b4cb401609d409..d26b36ba98e493 100644
--- a/PCbuild/tcltk.props
+++ b/PCbuild/tcltk.props
@@ -17,15 +17,21 @@
     <tcltkDir Condition="$(tcltkDir) == ''">$(ExternalsDir)tcltk-$(TclVersion)\$(ArchName)\</tcltkDir>
     <tclWin32Exe Condition="$(Platform) == 'Win32'">$(tcltkDir)\bin\tclsh$(TclMajorVersion)$(TclMinorVersion)t.exe</tclWin32Exe>
     <tclWin32Exe Condition="$(Platform) != 'Win32'">$(tcltkDir)\..\win32\bin\tclsh$(TclMajorVersion)$(TclMinorVersion)t.exe</tclWin32Exe>
+    <tclExternalTommath Condition="$(TclMajorVersion) == '9'">TCL_WITH_EXTERNAL_TOMMATH;</tclExternalTommath>
 
     <!--<TclDebugExt Condition="'$(Configuration)' == 'Debug'">g</TclDebugExt>-->
-    <tclDLLName>tcl$(TclMajorVersion)$(TclMinorVersion)t$(TclDebugExt).dll</tclDLLName>
-    <tclLibName>tcl$(TclMajorVersion)$(TclMinorVersion)t$(TclDebugExt).lib</tclLibName>
-    <tclShExeName>tclsh$(TclMajorVersion)$(TclMinorVersion)t$(TclDebugExt).exe</tclShExeName>
-    <tkDLLName>tk$(TkMajorVersion)$(TkMinorVersion)t$(TclDebugExt).dll</tkDLLName>
-    <tkLibName>tk$(TkMajorVersion)$(TkMinorVersion)t$(TclDebugExt).lib</tkLibName>
+    <tcltkSuffix Condition="'$(TclMajorVersion)' == '8'">t</tcltkSuffix>
+    <tkPrefix Condition="'$(TclMajorVersion)' == '9'">tcl9</tkPrefix>
+    <tclDLLName >tcl$(TclMajorVersion)$(TclMinorVersion)$(tcltkSuffix)$(TclDebugExt).dll</tclDLLName>
+    <tclLibName>tcl$(TclMajorVersion)$(TclMinorVersion)$(tcltkSuffix)$(TclDebugExt).lib</tclLibName>
+    <tclShExeName>tclsh$(TclMajorVersion)$(TclMinorVersion)$(tcltkSuffix)$(TclDebugExt).exe</tclShExeName>
+    <tkDLLName>$(tkPrefix)tk$(TkMajorVersion)$(TkMinorVersion)$(tcltkSuffix)$(TclDebugExt).dll</tkDLLName>
+    <tkLibName>$(tkPrefix)tk$(TclMajorVersion)$(TclMinorVersion)$(tcltkSuffix)$(TclDebugExt).lib</tkLibName>
     <tclZlibDLLName>zlib1.dll</tclZlibDLLName>
-    <tcltkLib>$(tcltkDir)lib\tcl$(TclMajorVersion)$(TclMinorVersion)t$(TclDebugExt).lib;$(tcltkDir)lib\tk$(TkMajorVersion)$(TkMinorVersion)t$(TclDebugExt).lib</tcltkLib>
+    <tommathDLLName Condition="'$(TclMajorVersion)' == '9'">libtommath.dll</tommathDLLName>
+    <tommathLibName Condition="'$(TclMajorVersion)' == '9'">tommath.lib</tommathLibName>
+    <tcltkLib>$(tcltkDir)lib\$(TclLibName);$(tcltkDir)lib\$(TkLibName);</tcltkLib>
+    <tcltkLib Condition="'$(tommathLibName)' != ''">$(tcltkLib);$(tcltkDir)lib\$(tommathLibName)</tcltkLib>
     <TclMachine>IX86</TclMachine>
     <TclMachine Condition="'$(Platform)' == 'x64'">AMD64</TclMachine>
     <TclMachine Condition="'$(Platform)' == 'ARM64'">ARM64</TclMachine>