From 1fbad9caaf07401e3206cd8c355721952bdbfbce Mon Sep 17 00:00:00 2001
From: Luke Wilde <lukew@serenityos.org>
Date: Sat, 5 Nov 2022 15:17:33 +0000
Subject: [PATCH] LibWeb: Recognise the ::placeholder pseudo element

This doesn't give it any functionality.
---
 Userland/Libraries/LibWeb/CSS/Selector.cpp | 2 ++
 Userland/Libraries/LibWeb/CSS/Selector.h   | 5 ++++-
 Userland/Libraries/LibWeb/Dump.cpp         | 3 +++
 3 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/Userland/Libraries/LibWeb/CSS/Selector.cpp b/Userland/Libraries/LibWeb/CSS/Selector.cpp
index ca10a764ef..02e3656a30 100644
--- a/Userland/Libraries/LibWeb/CSS/Selector.cpp
+++ b/Userland/Libraries/LibWeb/CSS/Selector.cpp
@@ -356,6 +356,8 @@ Optional<Selector::PseudoElement> pseudo_element_from_string(StringView name)
         return Selector::PseudoElement::ProgressBar;
     } else if (name.equals_ignoring_case("-webkit-progress-value"sv)) {
         return Selector::PseudoElement::ProgressValue;
+    } else if (name.equals_ignoring_case("placeholder"sv)) {
+        return Selector::PseudoElement::Placeholder;
     }
     return {};
 }
diff --git a/Userland/Libraries/LibWeb/CSS/Selector.h b/Userland/Libraries/LibWeb/CSS/Selector.h
index 14ebcdadca..81f65191f5 100644
--- a/Userland/Libraries/LibWeb/CSS/Selector.h
+++ b/Userland/Libraries/LibWeb/CSS/Selector.h
@@ -27,7 +27,8 @@ public:
         FirstLetter,
         Marker,
         ProgressValue,
-        ProgressBar
+        ProgressBar,
+        Placeholder,
     };
     static auto constexpr PseudoElementCount = to_underlying(PseudoElement::ProgressBar) + 1;
 
@@ -224,6 +225,8 @@ constexpr StringView pseudo_element_name(Selector::PseudoElement pseudo_element)
         return "-webkit-progress-bar"sv;
     case Selector::PseudoElement::ProgressValue:
         return "-webkit-progress-value"sv;
+    case Selector::PseudoElement::Placeholder:
+        return "placeholder"sv;
     }
     VERIFY_NOT_REACHED();
 }
diff --git a/Userland/Libraries/LibWeb/Dump.cpp b/Userland/Libraries/LibWeb/Dump.cpp
index 87820759cb..08d4e6fb6d 100644
--- a/Userland/Libraries/LibWeb/Dump.cpp
+++ b/Userland/Libraries/LibWeb/Dump.cpp
@@ -505,6 +505,9 @@ void dump_selector(StringBuilder& builder, CSS::Selector const& selector)
                 case CSS::Selector::PseudoElement::ProgressValue:
                     pseudo_element_description = "-webkit-progress-value";
                     break;
+                case CSS::Selector::PseudoElement::Placeholder:
+                    pseudo_element_description = "placeholder";
+                    break;
                 }
 
                 builder.appendff(" pseudo_element={}", pseudo_element_description);