break-after
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。
/* 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 thebreak-before
value has precedence over thebreak-after
value, which itself has precedence over thebreak-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.
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
Page break aliases
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 |
浏览器兼容性
BCD tables only load in the browser