auto merge of #4289 : pcwalton/servo/hacker-news, r=SimonSapin

This patch provides some of the groundwork for column spans greater than
1. It implements the column-span CSS property as well as the
corresponding colspan attribute; although the former is not
well-specified outside of CSS multi-column layout, INTRINSIC refers to
it. Although width is distributed to spanning columns, they do not yet
contribute minimum and preferred widths; this will be implemented in a
follow-up.

The parsing for the legacy bgcolor and border attributes is
implemented according to the WHATWG HTML specification.

Additionally, this patch cleans up some miscellaneous formatting issues,
refactors layout/css somewhat to eliminate needless levels of
indirection, and cleans up the handling of table rowgroups.

New Hacker News screenshot: http://i.imgur.com/hnl2a7E.png

1 files changed, 3 insertions, 1 deletions

diff --git a/components/script/dom/bindings/trace.rs b/components/script/dom/bindings/trace.rs
index afd329137c0..b877d022c2e 100644
--- a/components/script/dom/bindings/trace.rs
+++ b/components/script/dom/bindings/trace.rs
@@ -32,6 +32,7 @@ use dom::bindings::utils::{Reflectable, Reflector, WindowProxyHandler};
 use dom::node::{Node, TrustedNodeAddress};
 
 use collections::hash::{Hash, Hasher};
+use cssparser::RGBA;
 use geom::rect::Rect;
 use html5ever::tree_builder::QuirksMode;
 use hyper::header::Headers;
@@ -48,7 +49,7 @@ use script_traits::UntrustedNodeAddress;
 use servo_msg::compositor_msg::ScriptListener;
 use servo_msg::constellation_msg::ConstellationChan;
 use servo_util::smallvec::{SmallVec1, SmallVec};
-use servo_util::str::LengthOrPercentageOrAuto;
+use servo_util::str::{LengthOrPercentageOrAuto};
 use std::cell::{Cell, RefCell};
 use std::collections::HashMap;
 use std::comm::{Receiver, Sender};
@@ -214,6 +215,7 @@ no_jsmanaged_fields!(LayoutChan)
 no_jsmanaged_fields!(WindowProxyHandler)
 no_jsmanaged_fields!(UntrustedNodeAddress)
 no_jsmanaged_fields!(LengthOrPercentageOrAuto)
+no_jsmanaged_fields!(RGBA)
 
 impl<'a> JSTraceable for &'a str {
     #[inline]