From 216b1664bd83a708605e149226f426d6cdbdf73a Mon Sep 17 00:00:00 2001
From: Karl Seguin <k@openmymind.io>
Date: Fri, 21 Nov 2025 20:10:02 +0800
Subject: [PATCH] :checked pseudoclass

---
 src/browser/tests/element/html/input.html | 113 +++++++++++++++-------
 src/browser/webapi/selector/List.zig      |   4 +
 src/browser/webapi/selector/Parser.zig    |   5 +
 src/browser/webapi/selector/Selector.zig  |   1 +
 4 files changed, 90 insertions(+), 33 deletions(-)

diff --git a/src/browser/tests/element/html/input.html b/src/browser/tests/element/html/input.html
index dbd79aa3..f7052f51 100644
--- a/src/browser/tests/element/html/input.html
+++ b/src/browser/tests/element/html/input.html
@@ -15,7 +15,7 @@
 
 <input id="disabled1" type="text" disabled>
 <input id="disabled2" type="checkbox">
-<!--
+
 <script id="type">
   testing.expectEqual('text', $('#text1').type)
   testing.expectEqual('text', $('#text2').type)
@@ -120,6 +120,28 @@
   testing.expectEqual('initial', $('#text1').defaultValue)
 </script>
 
+<script id="defaultValue_set">
+{
+  const input = document.createElement('input')
+  testing.expectEqual('', input.defaultValue)
+  testing.expectEqual(null, input.getAttribute('value'))
+
+  input.defaultValue = 'new default'
+  testing.expectEqual('new default', input.defaultValue)
+  testing.expectEqual('new default', input.getAttribute('value'))
+  testing.expectEqual('new default', input.value)
+
+  input.value = 'changed by user'
+  testing.expectEqual('changed by user', input.value)
+  testing.expectEqual('new default', input.defaultValue)
+
+  input.defaultValue = 'another default'
+  testing.expectEqual('another default', input.defaultValue)
+  testing.expectEqual('another default', input.getAttribute('value'))
+  testing.expectEqual('changed by user', input.value)
+}
+</script>
+
 <script id="defaultChecked">
   testing.expectEqual(true, $('#check1').defaultChecked)
   testing.expectEqual(false, $('#check2').defaultChecked)
@@ -130,6 +152,29 @@
   testing.expectEqual(true, $('#check1').defaultChecked)
 </script>
 
+<script id="defaultChecked_set">
+{
+  const input = document.createElement('input')
+  input.type = 'checkbox'
+  testing.expectEqual(false, input.defaultChecked)
+  testing.expectEqual(null, input.getAttribute('checked'))
+
+  input.defaultChecked = true
+  testing.expectEqual(true, input.defaultChecked)
+  testing.expectEqual('', input.getAttribute('checked'))
+  testing.expectEqual(true, input.checked)
+
+  input.checked = false
+  testing.expectEqual(false, input.checked)
+  testing.expectEqual(true, input.defaultChecked)
+
+  input.defaultChecked = false
+  testing.expectEqual(false, input.defaultChecked)
+  testing.expectEqual(null, input.getAttribute('checked'))
+  testing.expectEqual(false, input.checked)
+}
+</script>
+
 <script id="disabled_initial">
   testing.expectEqual(true, $('#disabled1').disabled)
   testing.expectEqual(false, $('#disabled2').disabled)
@@ -243,37 +288,6 @@
     testing.expectEqual('', input.getAttribute('checked'))
     testing.expectTrue(input.outerHTML.includes('checked'))
   }
-</script> -->
-
-<script id="defaultValue_set">
-{
-  const input = document.createElement('input')
-  testing.expectEqual('', input.defaultValue)
-  testing.expectEqual(null, input.getAttribute('value'))
-
-  input.defaultValue = 'new default'
-  testing.expectEqual('new default', input.defaultValue)
-  testing.expectEqual('new default', input.getAttribute('value'))
-  testing.expectEqual('new default', input.value)
-}
-</script>
-
-<!-- <script id="defaultChecked_set">
-{
-  const input = document.createElement('input')
-  input.type = 'checkbox'
-  testing.expectEqual(false, input.defaultChecked)
-  testing.expectEqual(null, input.getAttribute('checked'))
-
-  input.defaultChecked = true
-  testing.expectEqual(true, input.defaultChecked)
-  testing.expectEqual('', input.getAttribute('checked'))
-  testing.expectEqual(true, input.checked)
-
-  input.checked = false
-  testing.expectEqual(false, input.checked)
-  testing.expectEqual(true, input.defaultChecked)
-}
 </script>
 
 <input id="named1" type="text" name="username">
@@ -348,4 +362,37 @@
     testing.expectFalse(input.outerHTML.includes('required'))
   }
 </script>
- -->
+
+<script id="checked_pseudoclass">
+  // At this point, check1 is unchecked, check2 is checked (from checked_set test)
+  // radio2 is checked (from checked_set test)
+
+  // querySelector should find the first checked input
+  testing.expectEqual($('#check2'), document.querySelector('input:checked'))
+  testing.expectEqual(null, document.querySelector('#check1:checked'))
+  testing.expectEqual($('#check2'), document.querySelector('#check2:checked'))
+
+  {
+    const checkedInputs = document.querySelectorAll('input:checked')
+    testing.expectEqual(2, checkedInputs.length)
+    testing.expectEqual($('#check2'), checkedInputs[0])
+    testing.expectEqual($('#radio2'), checkedInputs[1])
+  }
+
+  // Text inputs should never match :checked
+  testing.expectEqual(null, document.querySelector('#text1:checked'))
+  testing.expectEqual(null, document.querySelector('#text2:checked'))
+
+  // Compound selectors
+  testing.expectEqual($('#check2'), document.querySelector('input[type="checkbox"]:checked'))
+  testing.expectEqual($('#radio2'), document.querySelector('input[type="radio"]:checked'))
+  testing.expectEqual($('#radio2'), document.querySelector('input[type="radio"][name="group1"]:checked'))
+
+  // Change state and verify selector updates dynamically
+  $('#check2').checked = false
+  $('#radio3').checked = true
+
+  testing.expectEqual(null, document.querySelector('input[type="checkbox"]:checked'))
+  testing.expectEqual($('#radio3'), document.querySelector('input[type="radio"]:checked'))
+  testing.expectEqual($('#radio3'), document.querySelector('input[type="radio"][name="group1"]:checked'))
+</script>
diff --git a/src/browser/webapi/selector/List.zig b/src/browser/webapi/selector/List.zig
index 7174ecc2..481a3697 100644
--- a/src/browser/webapi/selector/List.zig
+++ b/src/browser/webapi/selector/List.zig
@@ -500,6 +500,10 @@ fn attributeContainsWord(value: []const u8, word: []const u8) bool {
 fn matchesPseudoClass(el: *Node.Element, pseudo: Selector.PseudoClass) bool {
     switch (pseudo) {
         .modal => return false,
+        .checked => {
+            const input = el.is(Node.Element.Html.Input) orelse return false;
+            return input.getChecked();
+        },
         .first_child => return isFirstChild(el),
         .last_child => return isLastChild(el),
         .only_child => return isFirstChild(el) and isLastChild(el),
diff --git a/src/browser/webapi/selector/Parser.zig b/src/browser/webapi/selector/Parser.zig
index 0b465e1d..49813291 100644
--- a/src/browser/webapi/selector/Parser.zig
+++ b/src/browser/webapi/selector/Parser.zig
@@ -395,6 +395,8 @@ fn pseudoClass(self: *Parser, arena: Allocator, page: *Page) !Selector.PseudoCla
             return .{ .not = selectors.items };
         }
 
+
+
         return error.UnknownPseudoClass;
     }
 
@@ -402,6 +404,9 @@ fn pseudoClass(self: *Parser, arena: Allocator, page: *Page) !Selector.PseudoCla
         5 => {
             if (fastEql(name, "modal")) return .modal;
         },
+        7 => {
+            if (fastEql(name, "checked")) return .checked;
+        },
         10 => {
             if (fastEql(name, "only-child")) return .only_child;
             if (fastEql(name, "last-child")) return .last_child;
diff --git a/src/browser/webapi/selector/Selector.zig b/src/browser/webapi/selector/Selector.zig
index defc3014..15579b65 100644
--- a/src/browser/webapi/selector/Selector.zig
+++ b/src/browser/webapi/selector/Selector.zig
@@ -132,6 +132,7 @@ pub const AttributeMatcher = union(enum) {
 
 pub const PseudoClass = union(enum) {
     modal,
+    checked,
     first_child,
     last_child,
     only_child,