diff --git a/blink/renderer/core/dom/global_event_handlers.h b/blink/renderer/core/dom/global_event_handlers.h
index 66594c0d7f7..53899f8c092 100644
--- a/blink/renderer/core/dom/global_event_handlers.h
+++ b/blink/renderer/core/dom/global_event_handlers.h
@@ -45,7 +45,6 @@ class GlobalEventHandlers {
                                          kAnimationiteration)
   DEFINE_STATIC_ATTRIBUTE_EVENT_LISTENER(animationstart, kAnimationstart)
   DEFINE_STATIC_ATTRIBUTE_EVENT_LISTENER(auxclick, kAuxclick)
-  DEFINE_STATIC_ATTRIBUTE_EVENT_LISTENER(beforeinput, kBeforeinput)
   DEFINE_STATIC_ATTRIBUTE_EVENT_LISTENER(beforematch, kBeforematch)
   DEFINE_STATIC_ATTRIBUTE_EVENT_LISTENER(blur, kBlur)
   DEFINE_STATIC_ATTRIBUTE_EVENT_LISTENER(cancel, kCancel)
diff --git a/blink/renderer/core/dom/global_event_handlers.idl b/blink/renderer/core/dom/global_event_handlers.idl
index d3b7570af9a..53ce16fed36 100644
--- a/blink/renderer/core/dom/global_event_handlers.idl
+++ b/blink/renderer/core/dom/global_event_handlers.idl
@@ -33,7 +33,6 @@
     LegacyTreatAsPartialInterface
 ] interface mixin GlobalEventHandlers {
     attribute EventHandler onabort;
-    attribute EventHandler onbeforeinput;
     [RuntimeEnabled=BeforeMatchEvent] attribute EventHandler onbeforematch;
     attribute EventHandler onblur;
     attribute EventHandler oncancel;
diff --git a/blink/renderer/core/html/html_attribute_names.json5 b/blink/renderer/core/html/html_attribute_names.json5
index caf9b35d142..479a25f17b4 100644
--- a/blink/renderer/core/html/html_attribute_names.json5
+++ b/blink/renderer/core/html/html_attribute_names.json5
@@ -163,7 +163,6 @@
     "onauxclick",
     "onbeforecopy",
     "onbeforecut",
-    "onbeforeinput",
     "onbeforepaste",
     "onbeforeprint",
     "onbeforeunload",
diff --git a/blink/renderer/core/html/html_element.cc b/blink/renderer/core/html/html_element.cc
index d895ac1bc95..894697a8299 100644
--- a/blink/renderer/core/html/html_element.cc
+++ b/blink/renderer/core/html/html_element.cc
@@ -471,8 +471,6 @@ AttributeTriggers* HTMLElement::TriggersForAttributeName(
        event_type_names::kBeforecopy, nullptr},
       {html_names::kOnbeforecutAttr, kNoWebFeature,
        event_type_names::kBeforecut, nullptr},
-      {html_names::kOnbeforeinputAttr, kNoWebFeature,
-       event_type_names::kBeforeinput, nullptr},
       {html_names::kOnbeforepasteAttr, kNoWebFeature,
        event_type_names::kBeforepaste, nullptr},
       {html_names::kOnblurAttr, kNoWebFeature, event_type_names::kBlur,
diff --git a/blink/web_tests/platform/generic/external/wpt/html/semantics/forms/beforeinput.tentative-expected.txt b/blink/web_tests/platform/generic/external/wpt/html/semantics/forms/beforeinput.tentative-expected.txt
new file mode 100644
index 00000000000..faf65093abc
--- /dev/null
+++ b/blink/web_tests/platform/generic/external/wpt/html/semantics/forms/beforeinput.tentative-expected.txt
@@ -0,0 +1,19 @@
+This is a testharness.js-based test.
+FAIL <input type="text" onbeforeinput="onBeforeInput(event)" oninput="onInput(event)"> assert_array_equals: Got expected events lengths differ, expected array ["beforeinput", "input"] length 2, got ["input"] length 1
+FAIL <input type="text"> assert_array_equals: Got expected events lengths differ, expected array ["beforeinput", "input"] length 2, got ["input"] length 1
+FAIL <input type="search" onbeforeinput="onBeforeInput(event)" oninput="onInput(event)"> assert_array_equals: Got expected events lengths differ, expected array ["beforeinput", "input"] length 2, got ["input"] length 1
+FAIL <input type="search"> assert_array_equals: Got expected events lengths differ, expected array ["beforeinput", "input"] length 2, got ["input"] length 1
+FAIL <input type="tel" onbeforeinput="onBeforeInput(event)" oninput="onInput(event)"> assert_array_equals: Got expected events lengths differ, expected array ["beforeinput", "input"] length 2, got ["input"] length 1
+FAIL <input type="tel"> assert_array_equals: Got expected events lengths differ, expected array ["beforeinput", "input"] length 2, got ["input"] length 1
+FAIL <input type="url" onbeforeinput="onBeforeInput(event)" oninput="onInput(event)"> assert_array_equals: Got expected events lengths differ, expected array ["beforeinput", "input"] length 2, got ["input"] length 1
+FAIL <input type="url"> assert_array_equals: Got expected events lengths differ, expected array ["beforeinput", "input"] length 2, got ["input"] length 1
+FAIL <input type="email" onbeforeinput="onBeforeInput(event)" oninput="onInput(event)"> assert_array_equals: Got expected events lengths differ, expected array ["beforeinput", "input"] length 2, got ["input"] length 1
+FAIL <input type="email"> assert_array_equals: Got expected events lengths differ, expected array ["beforeinput", "input"] length 2, got ["input"] length 1
+FAIL <input type="password" onbeforeinput="onBeforeInput(event)" oninput="onInput(event)"> assert_array_equals: Got expected events lengths differ, expected array ["beforeinput", "input"] length 2, got ["input"] length 1
+FAIL <input type="password"> assert_array_equals: Got expected events lengths differ, expected array ["beforeinput", "input"] length 2, got ["input"] length 1
+FAIL <input type="number" onbeforeinput="onBeforeInput(event)" oninput="onInput(event)"> assert_array_equals: Got expected events lengths differ, expected array ["beforeinput", "input"] length 2, got ["input"] length 1
+FAIL <input type="number"> assert_array_equals: Got expected events lengths differ, expected array ["beforeinput", "input"] length 2, got ["input"] length 1
+FAIL <textarea onbeforeinput="onBeforeInput(event)" oninput="onInput(event)"></textarea> assert_array_equals: Got expected events lengths differ, expected array ["beforeinput", "input"] length 2, got ["input"] length 1
+FAIL <textarea></textarea> assert_array_equals: Got expected events lengths differ, expected array ["beforeinput", "input"] length 2, got ["input"] length 1
+Harness: the test ran to completion.
+
diff --git a/blink/web_tests/platform/generic/fast/dom/Window/property-access-on-cached-window-after-frame-navigated-expected.txt b/blink/web_tests/platform/generic/fast/dom/Window/property-access-on-cached-window-after-frame-navigated-expected.txt
index b6b82ca6ea2..0c595358157 100644
--- a/blink/web_tests/platform/generic/fast/dom/Window/property-access-on-cached-window-after-frame-navigated-expected.txt
+++ b/blink/web_tests/platform/generic/fast/dom/Window/property-access-on-cached-window-after-frame-navigated-expected.txt
@@ -106,7 +106,6 @@ PASS oldChildWindow.onanimationiteration is newChildWindow.onanimationiteration
 PASS oldChildWindow.onanimationstart is newChildWindow.onanimationstart
 PASS oldChildWindow.onappinstalled is newChildWindow.onappinstalled
 PASS oldChildWindow.onauxclick is newChildWindow.onauxclick
-PASS oldChildWindow.onbeforeinput is newChildWindow.onbeforeinput
 PASS oldChildWindow.onbeforeinstallprompt is newChildWindow.onbeforeinstallprompt
 PASS oldChildWindow.onbeforematch is newChildWindow.onbeforematch
 PASS oldChildWindow.onbeforeprint is newChildWindow.onbeforeprint
diff --git a/blink/web_tests/platform/generic/fast/dom/Window/property-access-on-cached-window-after-frame-removed-and-gced-expected.txt b/blink/web_tests/platform/generic/fast/dom/Window/property-access-on-cached-window-after-frame-removed-and-gced-expected.txt
index 1983cad9160..b0eeaf208f5 100644
--- a/blink/web_tests/platform/generic/fast/dom/Window/property-access-on-cached-window-after-frame-removed-and-gced-expected.txt
+++ b/blink/web_tests/platform/generic/fast/dom/Window/property-access-on-cached-window-after-frame-removed-and-gced-expected.txt
@@ -51,7 +51,6 @@ PASS childWindow.onanimationiteration is null
 PASS childWindow.onanimationstart is null
 PASS childWindow.onappinstalled is null
 PASS childWindow.onauxclick is null
-PASS childWindow.onbeforeinput is null
 PASS childWindow.onbeforeinstallprompt is null
 PASS childWindow.onbeforematch is null
 PASS childWindow.onbeforeprint is null
diff --git a/blink/web_tests/platform/generic/fast/dom/Window/property-access-on-cached-window-after-frame-removed-expected.txt b/blink/web_tests/platform/generic/fast/dom/Window/property-access-on-cached-window-after-frame-removed-expected.txt
index 1dcb603a657..dea95b1350c 100644
--- a/blink/web_tests/platform/generic/fast/dom/Window/property-access-on-cached-window-after-frame-removed-expected.txt
+++ b/blink/web_tests/platform/generic/fast/dom/Window/property-access-on-cached-window-after-frame-removed-expected.txt
@@ -51,7 +51,6 @@ PASS childWindow.onanimationiteration is null
 PASS childWindow.onanimationstart is null
 PASS childWindow.onappinstalled is null
 PASS childWindow.onauxclick is null
-PASS childWindow.onbeforeinput is null
 PASS childWindow.onbeforeinstallprompt is null
 PASS childWindow.onbeforematch is null
 PASS childWindow.onbeforeprint is null
diff --git a/blink/web_tests/platform/generic/virtual/stable/fast/dom/Window/property-access-on-cached-window-after-frame-navigated-expected.txt b/blink/web_tests/platform/generic/virtual/stable/fast/dom/Window/property-access-on-cached-window-after-frame-navigated-expected.txt
index b0a4843236d..36efa30d35e 100644
--- a/blink/web_tests/platform/generic/virtual/stable/fast/dom/Window/property-access-on-cached-window-after-frame-navigated-expected.txt
+++ b/blink/web_tests/platform/generic/virtual/stable/fast/dom/Window/property-access-on-cached-window-after-frame-navigated-expected.txt
@@ -97,7 +97,6 @@ PASS oldChildWindow.onanimationiteration is newChildWindow.onanimationiteration
 PASS oldChildWindow.onanimationstart is newChildWindow.onanimationstart
 PASS oldChildWindow.onappinstalled is newChildWindow.onappinstalled
 PASS oldChildWindow.onauxclick is newChildWindow.onauxclick
-PASS oldChildWindow.onbeforeinput is newChildWindow.onbeforeinput
 PASS oldChildWindow.onbeforeinstallprompt is newChildWindow.onbeforeinstallprompt
 PASS oldChildWindow.onbeforematch is newChildWindow.onbeforematch
 PASS oldChildWindow.onbeforeprint is newChildWindow.onbeforeprint
diff --git a/blink/web_tests/platform/generic/virtual/stable/fast/dom/Window/property-access-on-cached-window-after-frame-removed-and-gced-expected.txt b/blink/web_tests/platform/generic/virtual/stable/fast/dom/Window/property-access-on-cached-window-after-frame-removed-and-gced-expected.txt
index 9218d2a82b0..2668bb3e49e 100644
--- a/blink/web_tests/platform/generic/virtual/stable/fast/dom/Window/property-access-on-cached-window-after-frame-removed-and-gced-expected.txt
+++ b/blink/web_tests/platform/generic/virtual/stable/fast/dom/Window/property-access-on-cached-window-after-frame-removed-and-gced-expected.txt
@@ -49,7 +49,6 @@ PASS childWindow.onanimationiteration is null
 PASS childWindow.onanimationstart is null
 PASS childWindow.onappinstalled is null
 PASS childWindow.onauxclick is null
-PASS childWindow.onbeforeinput is null
 PASS childWindow.onbeforeinstallprompt is null
 PASS childWindow.onbeforematch is null
 PASS childWindow.onbeforeprint is null
diff --git a/blink/web_tests/platform/generic/virtual/stable/fast/dom/Window/property-access-on-cached-window-after-frame-removed-expected.txt b/blink/web_tests/platform/generic/virtual/stable/fast/dom/Window/property-access-on-cached-window-after-frame-removed-expected.txt
index 98822b4c336..4d57870a733 100644
--- a/blink/web_tests/platform/generic/virtual/stable/fast/dom/Window/property-access-on-cached-window-after-frame-removed-expected.txt
+++ b/blink/web_tests/platform/generic/virtual/stable/fast/dom/Window/property-access-on-cached-window-after-frame-removed-expected.txt
@@ -49,7 +49,6 @@ PASS childWindow.onanimationiteration is null
 PASS childWindow.onanimationstart is null
 PASS childWindow.onappinstalled is null
 PASS childWindow.onauxclick is null
-PASS childWindow.onbeforeinput is null
 PASS childWindow.onbeforeinstallprompt is null
 PASS childWindow.onbeforematch is null
 PASS childWindow.onbeforeprint is null
diff --git a/blink/web_tests/platform/generic/virtual/stable/webexposed/element-instance-property-listing-expected.txt b/blink/web_tests/platform/generic/virtual/stable/webexposed/element-instance-property-listing-expected.txt
index a018261000b..7bbbdaa2bf4 100644
--- a/blink/web_tests/platform/generic/virtual/stable/webexposed/element-instance-property-listing-expected.txt
+++ b/blink/web_tests/platform/generic/virtual/stable/webexposed/element-instance-property-listing-expected.txt
@@ -164,7 +164,6 @@ namespace http://www.w3.org/1999/xhtml
     property onauxclick
     property onbeforecopy
     property onbeforecut
-    property onbeforeinput
     property onbeforematch
     property onbeforepaste
     property onbeforexrselect
@@ -1331,7 +1330,6 @@ namespace http://www.w3.org/2000/svg
     property onauxclick
     property onbeforecopy
     property onbeforecut
-    property onbeforeinput
     property onbeforematch
     property onbeforepaste
     property onbeforexrselect
diff --git a/blink/web_tests/platform/generic/virtual/stable/webexposed/global-interface-listing-expected.txt b/blink/web_tests/platform/generic/virtual/stable/webexposed/global-interface-listing-expected.txt
index 948e1274a3e..4443e2543cf 100644
--- a/blink/web_tests/platform/generic/virtual/stable/webexposed/global-interface-listing-expected.txt
+++ b/blink/web_tests/platform/generic/virtual/stable/webexposed/global-interface-listing-expected.txt
@@ -1428,7 +1428,6 @@ interface Document : Node
     getter onauxclick
     getter onbeforecopy
     getter onbeforecut
-    getter onbeforeinput
     getter onbeforematch
     getter onbeforepaste
     getter onbeforexrselect
@@ -1631,7 +1630,6 @@ interface Document : Node
     setter onauxclick
     setter onbeforecopy
     setter onbeforecut
-    setter onbeforeinput
     setter onbeforematch
     setter onbeforepaste
     setter onbeforexrselect
@@ -2716,7 +2714,6 @@ interface HTMLElement : Element
     getter onanimationiteration
     getter onanimationstart
     getter onauxclick
-    getter onbeforeinput
     getter onbeforematch
     getter onbeforexrselect
     getter onblur
@@ -2840,7 +2837,6 @@ interface HTMLElement : Element
     setter onanimationiteration
     setter onanimationstart
     setter onauxclick
-    setter onbeforeinput
     setter onbeforematch
     setter onbeforexrselect
     setter onblur
@@ -6359,7 +6355,6 @@ interface SVGElement : Element
     getter onanimationiteration
     getter onanimationstart
     getter onauxclick
-    getter onbeforeinput
     getter onbeforematch
     getter onbeforexrselect
     getter onblur
@@ -6467,7 +6462,6 @@ interface SVGElement : Element
     setter onanimationiteration
     setter onanimationstart
     setter onauxclick
-    setter onbeforeinput
     setter onbeforematch
     setter onbeforexrselect
     setter onblur
@@ -10336,7 +10330,6 @@ namespace CSS
     getter onanimationstart
     getter onappinstalled
     getter onauxclick
-    getter onbeforeinput
     getter onbeforeinstallprompt
     getter onbeforematch
     getter onbeforeprint
@@ -10551,7 +10544,6 @@ namespace CSS
     setter onanimationstart
     setter onappinstalled
     setter onauxclick
-    setter onbeforeinput
     setter onbeforeinstallprompt
     setter onbeforematch
     setter onbeforeprint
diff --git a/blink/web_tests/platform/generic/webexposed/element-instance-property-listing-expected.txt b/blink/web_tests/platform/generic/webexposed/element-instance-property-listing-expected.txt
index f3cd01f8440..928855bef3c 100644
--- a/blink/web_tests/platform/generic/webexposed/element-instance-property-listing-expected.txt
+++ b/blink/web_tests/platform/generic/webexposed/element-instance-property-listing-expected.txt
@@ -180,7 +180,6 @@ namespace http://www.w3.org/1999/xhtml
     property onauxclick
     property onbeforecopy
     property onbeforecut
-    property onbeforeinput
     property onbeforematch
     property onbeforepaste
     property onbeforexrselect
@@ -1400,7 +1399,6 @@ namespace http://www.w3.org/2000/svg
     property onauxclick
     property onbeforecopy
     property onbeforecut
-    property onbeforeinput
     property onbeforematch
     property onbeforepaste
     property onbeforexrselect
diff --git a/blink/web_tests/platform/generic/webexposed/global-interface-listing-expected.txt b/blink/web_tests/platform/generic/webexposed/global-interface-listing-expected.txt
index 0776030783f..8731c50c966 100644
--- a/blink/web_tests/platform/generic/webexposed/global-interface-listing-expected.txt
+++ b/blink/web_tests/platform/generic/webexposed/global-interface-listing-expected.txt
@@ -1793,7 +1793,6 @@ interface Document : Node
     getter onauxclick
     getter onbeforecopy
     getter onbeforecut
-    getter onbeforeinput
     getter onbeforematch
     getter onbeforepaste
     getter onbeforexrselect
@@ -2001,7 +2000,6 @@ interface Document : Node
     setter onauxclick
     setter onbeforecopy
     setter onbeforecut
-    setter onbeforeinput
     setter onbeforematch
     setter onbeforepaste
     setter onbeforexrselect
@@ -3197,7 +3195,6 @@ interface HTMLElement : Element
     getter onanimationiteration
     getter onanimationstart
     getter onauxclick
-    getter onbeforeinput
     getter onbeforematch
     getter onbeforexrselect
     getter onblur
@@ -3325,7 +3322,6 @@ interface HTMLElement : Element
     setter onanimationiteration
     setter onanimationstart
     setter onauxclick
-    setter onbeforeinput
     setter onbeforematch
     setter onbeforexrselect
     setter onblur
@@ -5134,7 +5130,6 @@ interface MathMLElement : Element
     getter onanimationiteration
     getter onanimationstart
     getter onauxclick
-    getter onbeforeinput
     getter onbeforematch
     getter onbeforexrselect
     getter onblur
@@ -5243,7 +5238,6 @@ interface MathMLElement : Element
     setter onanimationiteration
     setter onanimationstart
     setter onauxclick
-    setter onbeforeinput
     setter onbeforematch
     setter onbeforexrselect
     setter onblur
@@ -7348,7 +7342,6 @@ interface SVGElement : Element
     getter onanimationiteration
     getter onanimationstart
     getter onauxclick
-    getter onbeforeinput
     getter onbeforematch
     getter onbeforexrselect
     getter onblur
@@ -7459,7 +7452,6 @@ interface SVGElement : Element
     setter onanimationiteration
     setter onanimationstart
     setter onauxclick
-    setter onbeforeinput
     setter onbeforematch
     setter onbeforexrselect
     setter onblur
@@ -11611,7 +11603,6 @@ namespace CSS
     getter onanimationstart
     getter onappinstalled
     getter onauxclick
-    getter onbeforeinput
     getter onbeforeinstallprompt
     getter onbeforematch
     getter onbeforeprint
@@ -11833,7 +11824,6 @@ namespace CSS
     setter onanimationstart
     setter onappinstalled
     setter onauxclick
-    setter onbeforeinput
     setter onbeforeinstallprompt
     setter onbeforematch
     setter onbeforeprint