style: Implement basic column spans.

This patch provides some of the groundwork for column spans greater than
1. It implements the column-span CSS property (prefixed so as not to be
exposed to content) 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.

Additionally, this patch cleans up some miscellaneous formatting issues
and improves the handling of table rowgroups.

1 files changed, 3 insertions, 0 deletions

diff --git a/components/script/dom/htmltableelement.rs b/components/script/dom/htmltableelement.rs
index 4ece4c8b9f9..d88017fe151 100644
--- a/components/script/dom/htmltableelement.rs
+++ b/components/script/dom/htmltableelement.rs
@@ -108,6 +108,7 @@ impl HTMLTableElementHelpers for HTMLTableElement {
     fn get_border(&self) -> Option<u32> {
         self.border.get()
     }
+
     fn get_width(&self) -> LengthOrPercentageOrAuto {
         self.width.get()
     }
@@ -135,6 +136,7 @@ impl<'a> VirtualMethods for JSRef<'a, HTMLTableElement> {
                                                                      .as_slice()
                                                                      .chars()).unwrap_or(1)))
             }
+            &atom!("width") => self.width.set(str::parse_length(attr.value().as_slice())),
             _ => ()
         }
     }
@@ -148,6 +150,7 @@ impl<'a> VirtualMethods for JSRef<'a, HTMLTableElement> {
         match attr.local_name() {
             &atom!("bgcolor") => self.background_color.set(None),
             &atom!("border") => self.border.set(None),
+            &atom!("width") => self.width.set(AutoLpa),
             _ => ()
         }
     }