From d92f66246e5c78b684ff0e640942331e552c94a6 Mon Sep 17 00:00:00 2001
From: Mats Palmgren <mats@mozilla.com>
Date: Mon, 22 May 2023 09:55:31 +0200
Subject: [PATCH] style: [css-content] Implement 'content: none' for elements

Differential Revision: https://phabricator.services.mozilla.com/D114130
---
 components/style/values/resolved/counters.rs | 21 ++++++++++----------
 1 file changed, 10 insertions(+), 11 deletions(-)

diff --git a/components/style/values/resolved/counters.rs b/components/style/values/resolved/counters.rs
index 3bb439a104d..c00e63fda22 100644
--- a/components/style/values/resolved/counters.rs
+++ b/components/style/values/resolved/counters.rs
@@ -23,20 +23,19 @@ impl ToResolvedValue for computed::Content {
 
     #[inline]
     fn to_resolved_value(self, context: &Context) -> Self {
-        let is_before_or_after = context
-            .style
-            .pseudo()
-            .map_or(false, |p| p.is_before_or_after());
-        let is_marker = context
-            .style
-            .pseudo()
-            .map_or(false, |p| p.is_marker());
-
+        let (is_pseudo, is_before_or_after, is_marker) =
+            match context.style.pseudo() {
+                Some(ref pseudo) => (true, pseudo.is_before_or_after(), pseudo.is_marker()),
+                None => (false, false, false)
+            };
         match self {
             Self::Normal if is_before_or_after => Self::None,
-            // For now, make `content: none` compute to `normal` for elements
+            // For now, make `content: none` compute to `normal` for pseudos
             // other than ::before, ::after and ::marker, as we don't respect it.
-            Self::None if !is_before_or_after && !is_marker => Self::Normal,
+            // https://github.com/w3c/csswg-drafts/issues/6124
+            // Ditto for non-pseudo elements if the pref is disabled.
+            Self::None if (is_pseudo && !is_before_or_after && !is_marker) ||
+                (!is_pseudo && !static_prefs::pref!("layout.css.element-content-none.enabled")) => Self::Normal,
             other => other,
         }
     }