diff --git a/resources/testdriver.js b/resources/testdriver.js
index 87df7a48416bd3..f8238ab4a8ef70 100644
--- a/resources/testdriver.js
+++ b/resources/testdriver.js
@@ -1032,14 +1032,6 @@
             console.log('JV666 TEST_DRIVER testdriver.js set_device_posture: ' + posture);
             return window.test_driver_internal.set_device_posture(posture, context);
         },
-
-        /**
-         * Sets the viewport orientation.
-         */
-        async set_display_feature(orientation, offset, mask_length, context=null) {
-            console.log('JV666 TEST_DRIVER testdriver.js set_display_feature: ' + orientation + ' ' + offset + ' ' + mask_length);
-            return window.test_driver_internal.set_display_feature(orientation, offset, mask_length, context);
-        }
     };
 
     window.test_driver_internal = {
@@ -1223,10 +1215,6 @@
 
         async set_device_posture(posture, context=null) {
             throw new Error("set_device_posture() is not implemented by testdriver-vendor.js");
-        },
-
-        async set_display_feature(orientation, offset, mask_length, context=null) {
-          throw new Error("set_display_feature() is not implemented by testdriver-vendor.js");
         }
     };
 })();
diff --git a/tools/wptrunner/wptrunner/executors/actions.py b/tools/wptrunner/wptrunner/executors/actions.py
index b6c2781c4db84e..a0685322b6e32d 100644
--- a/tools/wptrunner/wptrunner/executors/actions.py
+++ b/tools/wptrunner/wptrunner/executors/actions.py
@@ -455,20 +455,6 @@ def __call__(self, payload):
         self.logger.debug("JV666 tools/wptrunner/wptrunner/executors/actions.py set_device_posture: %s" % posture)
         return self.protocol.device_posture.set_device_posture(posture)
 
-class SetDisplayFeature:
-    name = "set_display_feature"
-
-    def __init__(self, logger, protocol):
-        self.logger = logger
-        self.protocol = protocol
-
-    def __call__(self, payload):
-        orientation = payload["orientation"]
-        offset = payload["offset"]
-        mask_length = payload["mask_length"]
-        self.logger.debug("JV666 tools/wptrunner/wptrunner/executors/actions.py set_display_feature: %s" % orientation)
-        return self.protocol.display_feature.set_display_feature(orientation, offset, mask_length)
-
 actions = [ClickAction,
            DeleteAllCookiesAction,
            GetAllCookiesAction,
@@ -503,5 +489,4 @@ def __call__(self, payload):
            UpdateVirtualSensorAction,
            RemoveVirtualSensorAction,
            GetVirtualSensorInformationAction,
-           SetDevicePostureAction,
-           SetDisplayFeature]
+           SetDevicePostureAction]
diff --git a/tools/wptrunner/wptrunner/executors/executorwebdriver.py b/tools/wptrunner/wptrunner/executors/executorwebdriver.py
index 4552300c6eb15f..88d55e33a641d0 100644
--- a/tools/wptrunner/wptrunner/executors/executorwebdriver.py
+++ b/tools/wptrunner/wptrunner/executors/executorwebdriver.py
@@ -36,7 +36,6 @@
                        FedCMProtocolPart,
                        VirtualSensorProtocolPart,
                        DevicePostureProtocolPart,
-                       DisplayFeatureProtocolPart,
                        merge_dicts)
 
 from webdriver.client import Session
@@ -442,17 +441,6 @@ def set_device_posture(self, posture):
         self.logger.debug("JV666 tools/wptrunner/wptrunner/executors/executorwebdriver.py set_device_posture: %s" % posture)
         return self.webdriver.send_session_command("POST", "deviceposture", body)
 
-class WebDriverDisplayFeaturePart(DisplayFeatureProtocolPart):
-    def setup(self):
-        self.webdriver = self.parent.webdriver
-
-    def set_display_feature(self, orientation, offset, mask_length):
-        body = {"orientation": orientation}
-        body.update({"offset": offset})
-        body.update({"maskLength": mask_length})
-        self.logger.debug("JV666 tools/wptrunner/wptrunner/executors/executorwebdriver.py set_display_feature: %s" % orientation)
-        return self.webdriver.send_session_command("POST", "displayfeature", body)
-
 class WebDriverProtocol(Protocol):
     implements = [WebDriverBaseProtocolPart,
                   WebDriverTestharnessProtocolPart,
@@ -472,8 +460,7 @@ class WebDriverProtocol(Protocol):
                   WebDriverFedCMProtocolPart,
                   WebDriverDebugProtocolPart,
                   WebDriverVirtualSensorPart,
-                  WebDriverDevicePosturePart,
-                  WebDriverDisplayFeaturePart]
+                  WebDriverDevicePosturePart]
 
     def __init__(self, executor, browser, capabilities, **kwargs):
         super().__init__(executor, browser)
diff --git a/tools/wptrunner/wptrunner/executors/protocol.py b/tools/wptrunner/wptrunner/executors/protocol.py
index 56fb52f689b3e4..2aba9f676c7119 100644
--- a/tools/wptrunner/wptrunner/executors/protocol.py
+++ b/tools/wptrunner/wptrunner/executors/protocol.py
@@ -812,13 +812,3 @@ class DevicePostureProtocolPart(ProtocolPart):
     @abstractmethod
     def set_device_posture(self, posture):
         pass
-
-class DisplayFeatureProtocolPart(ProtocolPart):
-    """Protocol part for Display Feature"""
-    __metaclass__ = ABCMeta
-
-    name = "display_feature"
-
-    @abstractmethod
-    def set_display_feature(self, orientation, offset, mask_length):
-        pass
diff --git a/tools/wptrunner/wptrunner/testdriver-extra.js b/tools/wptrunner/wptrunner/testdriver-extra.js
index 8af6285701bfe6..b0968849a4ff18 100644
--- a/tools/wptrunner/wptrunner/testdriver-extra.js
+++ b/tools/wptrunner/wptrunner/testdriver-extra.js
@@ -332,9 +332,4 @@
       console.log('JV666 TEST_DRIVER tools/wptrunner/wptrunner/testdriver-extra.js set_device_posture: ' + posture);
       return create_action("set_device_posture", {posture, context});
     };
-
-    window.test_driver_internal.set_display_feature = function(orientation, offset, mask_length, context=null) {
-      console.log('JV666 TEST_DRIVER tools/wptrunner/wptrunner/testdriver-extra.js set_display_feature: ' + orientation + ' ' + offset + ' ' + mask_length);
-      return create_action("set_display_feature", {orientation, offset, mask_length, context});
-    };
 })();
diff --git a/visual-viewport/display-feature.html b/visual-viewport/display-feature.html
deleted file mode 100644
index 315f7e974325e5..00000000000000
--- a/visual-viewport/display-feature.html
+++ /dev/null
@@ -1,41 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>Viewport Segments: visualViewport.segments</title>
-<link rel="help" href="https://wicg.github.io/visual-viewport/"/>
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script src="/resources/testdriver.js"></script>
-<script src="/resources/testdriver-vendor.js"></script>
-<script>
-"use strict";
-
-promise_test(async t => {
-  assert_true('segments' in visualViewport, "`segments` must be a property of visualViewport.");
-  assert_equals(visualViewport.segments, null, "For a viewport not segmented, no segments must be exposed.");
-
-  // HORIZONTAL
-  await test_driver.set_display_feature('horizontal', 380, 30);
-  assert_equals(window.visualViewport.segments.length, 2);
-  assert_true(matchMedia('(horizontal-viewport-segments: 1)').matches);
-  assert_true(matchMedia('(vertical-viewport-segments: 2)').matches);
-  assert_not_equals(visualViewport.segments, null, "For a viewport segmented, segments must be exposed.");
-  console.log('JV666 visualViewport.segments: ' + JSON.stringify(visualViewport.segments, null, 2));
-
-  // VERTICAL
-  const segmentsMQL = window.matchMedia('(horizontal-viewport-segments: 2)');
-  const promise = new Promise(resolve => {
-    segmentsMQL.addEventListener(
-      'change',
-      () => { resolve(segmentsMQL.matches); },
-      { once: true }
-    );
-  });
-  await test_driver.set_display_feature('vertical', 390, 20);
-  assert_true(await promise)
-  assert_true(matchMedia('(horizontal-viewport-segments: 2)').matches);
-  assert_true(matchMedia('(vertical-viewport-segments: 1)').matches);
-  assert_not_equals(visualViewport.segments, null, "For a viewport segmented, segments must be exposed.");
-  console.log('JV666 visualViewport.segments: ' + JSON.stringify(visualViewport.segments, null, 2));
-}, 'Viewport segments');
-</script>
-