From cda4e6d75143a9f71182fb20c199ed18dbef4891 Mon Sep 17 00:00:00 2001
From: Xidorn Quan <me@upsuper.org>
Date: Tue, 27 Mar 2018 11:51:08 +1100
Subject: [PATCH] Add comment for overflow-{x,y} applying to ::placeholder.

---
 components/style/properties/longhand/box.mako.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/components/style/properties/longhand/box.mako.rs b/components/style/properties/longhand/box.mako.rs
index d0da5476bfe..e606f081c6c 100644
--- a/components/style/properties/longhand/box.mako.rs
+++ b/components/style/properties/longhand/box.mako.rs
@@ -205,6 +205,8 @@ ${helpers.single_keyword("-servo-overflow-clip-box", "padding-box content-box",
 %>
 
 // FIXME(pcwalton, #2742): Implement scrolling for `scroll` and `auto`.
+//
+// We allow it to apply to placeholders for UA sheets, which set it !important.
 ${helpers.single_keyword("overflow-x", "visible hidden scroll auto",
                          animation_value_type="discrete",
                          extra_gecko_values="-moz-hidden-unscrollable",
@@ -215,6 +217,8 @@ ${helpers.single_keyword("overflow-x", "visible hidden scroll auto",
                          servo_restyle_damage = "reflow")}
 
 // FIXME(pcwalton, #2742): Implement scrolling for `scroll` and `auto`.
+//
+// We allow it to apply to placeholders for UA sheets, which set it !important.
 <%helpers:longhand name="overflow-y" animation_value_type="discrete"
                    flags="APPLIES_TO_PLACEHOLDER",
                    spec="https://drafts.csswg.org/css-overflow/#propdef-overflow-y"