From 951250882b6ca35cfff36e2c6e846193e7c1e0aa Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Emilio=20Cobos=20=C3=81lvarez?= <emilio@crisal.io>
Date: Wed, 7 Mar 2018 11:57:58 +0100
Subject: [PATCH] style: Document #[css(skip_if)]

---
 components/style_traits/values.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/components/style_traits/values.rs b/components/style_traits/values.rs
index aad75d51b8a..d6bd05b7b40 100644
--- a/components/style_traits/values.rs
+++ b/components/style_traits/values.rs
@@ -34,6 +34,9 @@ use std::fmt::{self, Write};
 ///   dimension token, like: <member><identifier>;
 /// * if `#[css(skip)]` is found on a field, the `ToCss` call for that field
 ///   is skipped;
+/// * if `#[css(skip_if = "function")]` is found on a field, the `ToCss` call
+///   for that field is skipped if `function` returns true. This function is
+///   provided the field as an argument;
 /// * finally, one can put `#[css(derive_debug)]` on the whole type, to
 ///   implement `Debug` by a single call to `ToCss::to_css`.
 pub trait ToCss {