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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 | 否 |
| 适用媒体 | as each of the properties of the shorthand: |
| 计算值 | as specified |
| Animation type | discrete |
| 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 likeleft. verso- If pages progress left-to-right, then this acts like
left. If pages progress right-to-left, then this acts likeright.
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
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
| Feature | Chrome | Edge | Firefox | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| Basic support | 1 | 12 | 11 | 4 | 7 | 1.2 |
| Feature | Android webview | Chrome for Android | Edge mobile | Firefox for Android | Opera Android | iOS Safari | Samsung Internet |
|---|---|---|---|---|---|---|---|
| Basic support | ? | ? | Yes | 41 | ? | ? | ? |
1. The values avoid, left, and right are unsupported.