diff --git a/Libraries/LibWeb/DOM/EventHandler.idl b/Libraries/LibWeb/DOM/EventHandler.idl
index 80014516ed6..eb5d60bfabf 100644
--- a/Libraries/LibWeb/DOM/EventHandler.idl
+++ b/Libraries/LibWeb/DOM/EventHandler.idl
@@ -17,7 +17,7 @@ interface mixin GlobalEventHandlers {
     attribute EventHandler onabort;
     attribute EventHandler onauxclick;
     attribute EventHandler onbeforeinput;
-    // TODO: attribute EventHandler onbeforematch;
+    attribute EventHandler onbeforematch;
     attribute EventHandler onbeforetoggle;
     attribute EventHandler onblur;
     attribute EventHandler oncancel;
@@ -26,9 +26,9 @@ interface mixin GlobalEventHandlers {
     attribute EventHandler onchange;
     attribute EventHandler onclick;
     attribute EventHandler onclose;
-    // TODO: attribute EventHandler oncontextlost;
+    attribute EventHandler oncontextlost;
     attribute EventHandler oncontextmenu;
-    // TODO: attribute EventHandler oncontextrestored;
+    attribute EventHandler oncontextrestored;
     attribute EventHandler oncopy;
     attribute EventHandler oncuechange;
     attribute EventHandler oncut;
diff --git a/Libraries/LibWeb/HTML/AttributeNames.h b/Libraries/LibWeb/HTML/AttributeNames.h
index 469d3c9e816..a6dacd1bf93 100644
--- a/Libraries/LibWeb/HTML/AttributeNames.h
+++ b/Libraries/LibWeb/HTML/AttributeNames.h
@@ -138,6 +138,7 @@ namespace AttributeNames {
     __ENUMERATE_HTML_ATTRIBUTE(onafterprint)               \
     __ENUMERATE_HTML_ATTRIBUTE(onauxclick)                 \
     __ENUMERATE_HTML_ATTRIBUTE(onbeforeinput)              \
+    __ENUMERATE_HTML_ATTRIBUTE(onbeforematch)              \
     __ENUMERATE_HTML_ATTRIBUTE(onbeforeprint)              \
     __ENUMERATE_HTML_ATTRIBUTE(onbeforetoggle)             \
     __ENUMERATE_HTML_ATTRIBUTE(onbeforeunload)             \
@@ -148,7 +149,9 @@ namespace AttributeNames {
     __ENUMERATE_HTML_ATTRIBUTE(onchange)                   \
     __ENUMERATE_HTML_ATTRIBUTE(onclick)                    \
     __ENUMERATE_HTML_ATTRIBUTE(onclose)                    \
+    __ENUMERATE_HTML_ATTRIBUTE(oncontextlost)              \
     __ENUMERATE_HTML_ATTRIBUTE(oncontextmenu)              \
+    __ENUMERATE_HTML_ATTRIBUTE(oncontextrestored)          \
     __ENUMERATE_HTML_ATTRIBUTE(oncopy)                     \
     __ENUMERATE_HTML_ATTRIBUTE(oncuechange)                \
     __ENUMERATE_HTML_ATTRIBUTE(oncut)                      \
diff --git a/Libraries/LibWeb/HTML/EventNames.h b/Libraries/LibWeb/HTML/EventNames.h
index 9bb6304bcd6..d00c0b110fc 100644
--- a/Libraries/LibWeb/HTML/EventNames.h
+++ b/Libraries/LibWeb/HTML/EventNames.h
@@ -23,6 +23,7 @@ namespace Web::HTML::EventNames {
     __ENUMERATE_HTML_EVENT(animationiteration)       \
     __ENUMERATE_HTML_EVENT(animationstart)           \
     __ENUMERATE_HTML_EVENT(beforeinput)              \
+    __ENUMERATE_HTML_EVENT(beforematch)              \
     __ENUMERATE_HTML_EVENT(beforeprint)              \
     __ENUMERATE_HTML_EVENT(beforetoggle)             \
     __ENUMERATE_HTML_EVENT(beforeunload)             \
@@ -36,7 +37,9 @@ namespace Web::HTML::EventNames {
     __ENUMERATE_HTML_EVENT(close)                    \
     __ENUMERATE_HTML_EVENT(complete)                 \
     __ENUMERATE_HTML_EVENT(connect)                  \
+    __ENUMERATE_HTML_EVENT(contextlost)              \
     __ENUMERATE_HTML_EVENT(contextmenu)              \
+    __ENUMERATE_HTML_EVENT(contextrestored)          \
     __ENUMERATE_HTML_EVENT(controllerchange)         \
     __ENUMERATE_HTML_EVENT(copy)                     \
     __ENUMERATE_HTML_EVENT(cuechange)                \
diff --git a/Libraries/LibWeb/HTML/GlobalEventHandlers.h b/Libraries/LibWeb/HTML/GlobalEventHandlers.h
index 2d4cf4b2cd9..f06e2d115db 100644
--- a/Libraries/LibWeb/HTML/GlobalEventHandlers.h
+++ b/Libraries/LibWeb/HTML/GlobalEventHandlers.h
@@ -13,6 +13,7 @@
     E(onabort, HTML::EventNames::abort)                                       \
     E(onauxclick, UIEvents::EventNames::auxclick)                             \
     E(onbeforeinput, HTML::EventNames::beforeinput)                           \
+    E(onbeforematch, HTML::EventNames::beforematch)                           \
     E(onbeforetoggle, HTML::EventNames::beforetoggle)                         \
     E(onblur, HTML::EventNames::blur)                                         \
     E(oncancel, HTML::EventNames::cancel)                                     \
@@ -21,7 +22,9 @@
     E(onchange, HTML::EventNames::change)                                     \
     E(onclick, UIEvents::EventNames::click)                                   \
     E(onclose, HTML::EventNames::close)                                       \
+    E(oncontextlost, HTML::EventNames::contextlost)                           \
     E(oncontextmenu, HTML::EventNames::contextmenu)                           \
+    E(oncontextrestored, HTML::EventNames::contextrestored)                   \
     E(oncopy, HTML::EventNames::copy)                                         \
     E(oncuechange, HTML::EventNames::cuechange)                               \
     E(oncut, HTML::EventNames::cut)                                           \