From b68e4c2352045ac3303d60e03231d8e420ab2b13 Mon Sep 17 00:00:00 2001
From: Olli Pettay <Olli.Pettay@helsinki.fi>
Date: Thu, 28 Jun 2018 14:55:45 +0300
Subject: [PATCH] style: Implement :defined pseudo-class for custom elements.

Bug: 1331334
Reviewed-by: emilio
---
 components/style/element_state.rs                  | 3 ++-
 components/style/gecko/non_ts_pseudo_class_list.rs | 1 +
 components/style/gecko/selector_parser.rs          | 3 +++
 components/style/gecko/wrapper.rs                  | 1 +
 4 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/components/style/element_state.rs b/components/style/element_state.rs
index 0960ca3d4e11..c57cf4febe6a 100644
--- a/components/style/element_state.rs
+++ b/components/style/element_state.rs
@@ -71,7 +71,8 @@ bitflags! {
         const IN_OPTIONAL_STATE = 1 << 22;
         /// <https://html.spec.whatwg.org/multipage/#selector-read-write>
         const IN_READ_WRITE_STATE = 1 << 22;
-        /// There is a free bit at 23.
+        /// <https://html.spec.whatwg.org/multipage/semantics-other.html#selector-defined>
+        const IN_DEFINED_STATE = 1 << 23;
         /// <https://html.spec.whatwg.org/multipage/#selector-visited>
         const IN_VISITED_STATE = 1 << 24;
         /// <https://html.spec.whatwg.org/multipage/#selector-link>
diff --git a/components/style/gecko/non_ts_pseudo_class_list.rs b/components/style/gecko/non_ts_pseudo_class_list.rs
index b02e21fbf8a8..56e62b6de4bc 100644
--- a/components/style/gecko/non_ts_pseudo_class_list.rs
+++ b/components/style/gecko/non_ts_pseudo_class_list.rs
@@ -47,6 +47,7 @@ macro_rules! apply_non_ts_list {
                 ("visited", Visited, visited, IN_VISITED_STATE, _),
                 ("active", Active, active, IN_ACTIVE_STATE, _),
                 ("checked", Checked, checked, IN_CHECKED_STATE, _),
+                ("defined", Defined, defined, IN_DEFINED_STATE, _),
                 ("disabled", Disabled, disabled, IN_DISABLED_STATE, _),
                 ("enabled", Enabled, enabled, IN_ENABLED_STATE, _),
                 ("focus", Focus, focus, IN_FOCUS_STATE, _),
diff --git a/components/style/gecko/selector_parser.rs b/components/style/gecko/selector_parser.rs
index 57a98a89238b..7dfc9aa1bbc0 100644
--- a/components/style/gecko/selector_parser.rs
+++ b/components/style/gecko/selector_parser.rs
@@ -187,6 +187,9 @@ impl NonTSPseudoClass {
             NonTSPseudoClass::Fullscreen => unsafe {
                 mozilla::StaticPrefs_sVarCache_full_screen_api_unprefix_enabled
             },
+            NonTSPseudoClass::Defined => unsafe {
+                structs::nsContentUtils_sIsCustomElementsEnabled
+            },
             // Otherwise, a pseudo-class is enabled in content when it
             // doesn't have any enabled flag.
             _ => !self.has_any_flag(
diff --git a/components/style/gecko/wrapper.rs b/components/style/gecko/wrapper.rs
index ffac86e974f7..47205f7378bb 100644
--- a/components/style/gecko/wrapper.rs
+++ b/components/style/gecko/wrapper.rs
@@ -2124,6 +2124,7 @@ impl<'le> ::selectors::Element for GeckoElement<'le> {
     {
         use selectors::matching::*;
         match *pseudo_class {
+            NonTSPseudoClass::Defined |
             NonTSPseudoClass::Focus |
             NonTSPseudoClass::Enabled |
             NonTSPseudoClass::Disabled |