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style: Implement basic column spans.

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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.
This commit is contained in:
Patrick Walton 2014-12-07 23:01:35 -08:00
parent 14bafb11be
commit 56b78de5bc
13 changed files with 269 additions and 129 deletions
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4
components/style/selector_matching.rs
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@ -802,8 +802,8 @@ pub fn common_style_affecting_attributes() -> [CommonStyleAffectingAttributeInfo
/// Attributes that, if present, disable style sharing. All legacy HTML attributes must be in
/// either this list or `common_style_affecting_attributes`. See the comment in
/// `synthesize_presentational_hints_for_legacy_attributes`.
pub fn rare_style_affecting_attributes() -> [Atom, ..2] {
[ atom!("bgcolor"), atom!("border") ]
pub fn rare_style_affecting_attributes() -> [Atom, ..3] {
[ atom!("bgcolor"), atom!("border"), atom!("colspan") ]
}
/// Determines whether the given element matches the given single selector.