From b6c88745e8b16434ffa4504f8673165e0edeb6fe Mon Sep 17 00:00:00 2001
From: Charlie Marlow <cmarlow@mozilla.com>
Date: Tue, 4 Jun 2019 22:04:14 +0000
Subject: [PATCH] style: adding support for CSS text underline offset to the
 style system.

Support for from-font listed in the CSS spec will be implemented in a later bug.

Differential Revision: https://phabricator.services.mozilla.com/D33233
---
 .../style/properties/longhands/inherited_text.mako.rs | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/components/style/properties/longhands/inherited_text.mako.rs b/components/style/properties/longhands/inherited_text.mako.rs
index 58331efa6bdc..cb319f187704 100644
--- a/components/style/properties/longhands/inherited_text.mako.rs
+++ b/components/style/properties/longhands/inherited_text.mako.rs
@@ -374,3 +374,14 @@ ${helpers.single_keyword(
     products="gecko",
     spec="Nonstandard",
 )}
+
+// text underline offset
+${helpers.predefined_type(
+    "text-underline-offset",
+    "LengthOrAuto",
+    "computed::LengthOrAuto::auto()",
+    products="gecko",
+    animation_value_type="ComputedValue",
+    gecko_pref="layout.css.text-underline-offset.enabled",
+    spec="https://drafts.csswg.org/css-text-decor-4/#underline-offset",
+)}