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page-break-before CSS属性调整当前元素之前的分页符。

此属性适用于生成一个盒子的块元素。它不适用于不会生成一个盒子的空 <div>

/* Keyword values */
page-break-before: auto;
page-break-before: always;
page-break-before: avoid;
page-break-before: left;
page-break-before: right;
page-break-before: recto;
page-break-before: verso;

/* Global values */
page-break-before: inherit;
page-break-before: initial;
page-break-before: unset;

Note: this property is in progress of being replaced by the more generic break-before. This new property also handles column and region breaks and is syntactically compatible with page-break-before.

Before using page-break-before, check if you can use break-before instead. In the future page-break-before will be a mere alias for some values of it.

初始值auto
适用元素block-level elements in the normal flow of the root element. User agents may also apply it to other elements like table-row elements.
是否是继承属性
适用媒体as each of the properties of the shorthand:
  • visual: Value not found in DB!
  • paged: Value not found in DB!
计算值as specified
Animation typediscrete
正规顺序the unique non-ambiguous order defined by the formal grammar

Syntax

Values

auto
Initial value. Automatic page breaks (neither forced nor forbidden).
always
Always force page breaks before the element.
avoid
Avoid page breaks before the element.
left
Force page breaks before the element so that the next page is formatted as a left page.
right
Force page breaks before the element so that the next page is formatted as a right page.
recto
If pages progress left-to-right, then this acts like right. If pages progress right-to-left, then this acts like left.
verso
If pages progress left-to-right, then this acts like left. If pages progress right-to-left, then this acts like right.

Formal syntax

auto | always | avoid | left | right

Examples

/* avoid page break before the div */
div.note { 
    page-break-before: avoid;
} 

Specification

Specification Status Comment
CSS Logical Properties and Values Level 1
recto and verso
Editor's Draft Adds the values recto and verso.
CSS Paged Media Module Level 3
page-break-before
Working Draft Extends the element that this property applies to table rows and table row groups.
CSS Level 2 (Revision 1)
page-break-before
Recommendation Initial definition

Browser compatibility

 

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support11211471.2
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support ? ? Yes41 ? ? ?

1. The values avoid, left, and right are unsupported.

 

See also

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