CSS

分割容器后面栏或页面 | break-after

break-after

break-afterCSS 属性定义了页面、列或区域分隔符在生成的框之后的行为方式。如果没有生成的框, 则忽略该属性。

/* Generic break values */ break-after: auto; break-after: avoid; /* Page break values */ break-after: avoid-page; break-after: page; break-after: always; break-after: left; break-after: right; break-after: recto; break-after: verso; /* Column break values */ break-after: avoid-column; break-after: column; /* Region break values */ break-after: avoid-region; break-after: region; /* Global values */ break-after: inherit; break-after: initial; break-after: unset;

每个可能的断点(换句话说,每个元素边界)都受到三个属性的影响:break-after前一个元素的break-before值,下一个元素的break-inside值以及包含元素的值。

要确定是否必须进行break操作,应用以下规则:

  • 如果这三项值是被迫中断值之一alwaysleftrightpagecolumn,或region),它具有优先权。如果不止一个是这样一个中断,那么在流中出现最新的那个元素(即break-before优先于break-afterbreak-after优先于break-inside)。

  • 如果任何三种有关值是避免中断值avoidavoid-pageavoid-regionavoid-column),在该点处不施加任何动作。

一旦应用了强制中断, 可以在需要时添加软断点, 但不能在相应的避免值中解析的元素边界上进行。

初始值auto
应用于block-level elements
是否继承no
媒体paged
计算值as specified
动画类型discrete
规范顺序the unique non-ambiguous order defined by the formal grammar

语法

break-after属性被指定为下面列表中的一个关键字值。

取值

一般中断值

auto允许(但不强制)在主体框之后插入任何中断(页面,列或区域)。

分页符值

avoid-page在主体框后面避免任何分页符。

列中断值

avoid-column在主体框之后避免任何列中断。

区域中断值

avoid-region避免在主框之后出现任何区域中断。

形式语法

auto | avoid | avoid-page | page | left | right | recto | verso | avoid-column | column | avoid-region | region

规范

SpecificationStatusComment
CSS Fragmentation Module Level 3The definition of 'break-after' in that specification.Candidate RecommendationAdds the recto and verso keywords. Changes the media type of this property from paged to visual. Defines the breaking algorithm with different kinds of breaks.
CSS Regions Module Level 1The definition of 'break-after' in that specification.Working DraftExtends the property to handle region breaks. Adds the avoid-region and region keywords.
CSS Multi-column Layout ModuleThe definition of 'break-after' in that specification.Candidate RecommendationInitial definition. Extends the CSS 2.1 page-break-after property to handle both page and column breaks.

浏览器兼容性

FeatureChromeEdgeFirefox (Gecko)Internet ExplorerOperaSafari (WebKit)
Basic supportNo support1(Yes)2No support1011.10 - 12.1No support1
column, avoid-columnNo support1No supportNo support1011.10 - 12.1No support1
recto, versoNo supportNo supportNo supportNo supportNo supportNo support
region, avoid-regionNo support1No supportNo supportNo supportNo supportNo support1

FeatureAndroidEdgeFirefox Mobile (Gecko)IE PhoneOpera MobileSafari Mobile
Basic supportNo support1(Yes)2No support??No support1
column, avoid-columnNo support1No supportNo support??No support1
recto, versoNo supportNo supportNo supportNo supportNo supportNo support
region, avoid-regionNo support1No supportNo supportNo supportNo supportNo support1