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style: Implement page-break-{before,after} as legacy shorthands for {before,after}.

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This is all the style-system work needed for this.

This implements the concept of legacy shorthands, teaches tests to understand
it, and adds a few more tests for these properties in particular.

The WPT even caught a few WebKit / Blink bugs:

  https://bugs.chromium.org/p/chromium/issues/detail?id=906336
  https://bugs.webkit.org/show_bug.cgi?id=191803

This doesn't change the layout behavior for page-break-before: always, since
it'd stop breaking in multicol and such. Similarly, break-before / break-after:
column and page still behave the same, I'll file followups for those given
comment 22.

Differential Revision: https://phabricator.services.mozilla.com/D12211
This commit is contained in:
Emilio Cobos Álvarez 2018-11-30 05:35:47 +00:00
parent a427e4f763
commit 374249fa54
3 changed files with 98 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

8
components/style/properties/longhands/box.mako.rs
View file

@ -438,22 +438,22 @@ ${helpers.single_keyword(
)}
${helpers.predefined_type(
"page-break-after",
"break-after",
"BreakBetween",
"computed::BreakBetween::Auto",
needs_context=False,
products="gecko",
spec="https://drafts.csswg.org/css2/page.html#propdef-page-break-after",
spec="https://drafts.csswg.org/css-break/#propdef-break-after",
animation_value_type="discrete",
)}
${helpers.predefined_type(
"page-break-before",
"break-before",
"BreakBetween",
"computed::BreakBetween::Auto",
needs_context=False,
products="gecko",
spec="https://drafts.csswg.org/css2/page.html#propdef-page-break-before",
spec="https://drafts.csswg.org/css-break/#propdef-break-before",
animation_value_type="discrete",
)}