break-after

Baseline Widely available *

This feature is well established and works across many devices and browser versions. It’s been available across browsers since ⁨2019年1月⁩.

* Some parts of this feature may have varying levels of support.

break-after CSS 属性描述在生成的盒子之后的页面，列或区域中断行为（换句话说，如何以及是否中断）。如果没有生成的盒子，则该属性将被忽略。

css

/* Generic break values */
break-after: auto;
break-after: avoid;
break-after: always;
break-after: all;

/* Page break values */
break-after: avoid-page;
break-after: page;
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;

每个潜在的断点（亦即每个元素的边界）都受到三个属性的影响：上一个元素的 break-after 值、下一个元素的 break-before 值以及当前元素自身的 break-inside 值。

以下规则被用于判断中断是否必要：

如果上述三个属性中，如果任何一个的值属于“强制中断”值，那么这个属性将被优先应用，此处所称“强制中断”的值为： always、 left、 right、 page、 column 和 region。If several of the concerned values is such a break, the one of the element that appears the latest in the flow is taken (that is the break-before value has precedence over the break-after value, which itself has precedence over the break-inside value).
If any of the three concerned values is an avoid break value, that is avoid, avoid-page, avoid-region, avoid-column, no such break will be applied at that point.

Once forced breaks have been applied, soft breaks may be added if needed, but not on element boundaries that resolve in a corresponding avoid value.

初始值	`auto`
适用元素	block-level elements
是否是继承属性	否
计算值	as specified
动画类型	离散值

语法

The break-after property is specified as one of the keyword values from the list below.

属性值

Generic break values

auto: Allows, but does not force, any break (page, column, or region) to be inserted right after the principal box.
avoid: Avoids any break (page, column, or region) from being inserted right after the principal box.
always 实验性: Forces a page break right after the principal box. The type of this break is that of the immediately-containing fragmentation context. If we are inside a multicol container then it would force a column break, inside paged media (but not inside a multicol container) a page break.
all 实验性: Forces a page break right after the principal box. Breaking through all possible fragmentation contexts. So a break inside a multicol container, which was inside a page container would force a column and page break.

Page break values

avoid-page: Avoids any page break right after the principal box.
page: Forces a page break right after the principal box.
left: Forces one or two page breaks right after the principal box, whichever will make the next page into a left page.
right: Forces one or two page breaks right after the principal box, whichever will make the next page into a right page.
recto 实验性: Forces one or two page breaks right after the principal box, whichever will make the next page into a recto page. (A recto page is a right page in a left-to-right spread or a left page in a right-to-left spread.)
verso 实验性: Forces one or two page breaks right after the principal box, whichever will make the next page into a verso page. (A verso page is a left page in a left-to-right spread or a left right in a right-to-left spread.)

Column break values

avoid-column: Avoids any column break right after the principal box.
column: Forces a column break right after the principal box.

Region break values

avoid-region 实验性: Avoids any region break right after the principal box.
region 实验性: Forces a region break right after the principal box.

形式化语法

break-after = 
  auto          |
  avoid         |
  always        |
  all           |
  avoid-page    |
  page          |
  left          |
  right         |
  recto         |
  verso         |
  avoid-column  |
  column        |
  avoid-region  |
  region

For compatibility reasons, the legacy page-break-after property should be treated by browsers as an alias of break-after. This ensures that sites using page-break-after continue to work as designed. A subset of values should be aliased as follows:

page-break-after	break-after
`auto`	`auto`
`left`	`left`
`right`	`right`
`avoid`	`avoid`
`always`	`page`

备注：The always value of page-break-* was implemented by browsers as a page break, and not as a column break. Therefore the aliasing is to page, rather than the always value in the Level 4 spec.

规范

Specification
CSS Fragmentation Module Level 3 # break-between
CSS Regions Module Level 1 # region-flow-break
CSS Multi-column Layout Module Level 1 # break-before-break-after-break-inside

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