Thebreak-before
CSS property defines how page, column, or region breaks should behave before a generated box. If there is no generated box, the property is ignored.
/* Generic break values */ break-before: auto; break-before: avoid; /* Page break values */ break-before: avoid-page; break-before: page; break-before: always; break-before: left; break-before: right; break-before: recto; break-before: verso; /* Column break values */ break-before: avoid-column; break-before: column; /* Region break values */ break-before: avoid-region; break-before: region; /* Global values */ break-before: inherit; break-before: initial; break-before: unset;
Each possible break point (in other words, each element boundary) is affected by three properties: the break-after
value of the previous element, the break-before
value of the next element, and the break-inside
value of the containing element.
To determine if a break must be done, the following rules are applied:
always
, left
, right
, page
, column
, or region
), it has precedence. If more than one of them are such a break, the one of the element that appears the latest in the flow is taken (i.e., the break-before
value has precedence over the break-after
value, which itself has precedence over the break-inside
value).avoid
, avoid-page
, avoid-region
, or 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.
Initial value | auto |
---|---|
Applies to | block-level elements |
Inherited | no |
Media | paged |
Computed value | as specified |
Animation type | discrete |
Canonical order | the unique non-ambiguous order defined by the formal grammar |
The break-before
property is specified as one of the keyword values from the list below.
auto
avoid
avoid-page
page
always
page
, and has been kept to facilitate the transition from page-break-after
, which is a subset of this property.)left
right
recto
verso
avoid-column
column
avoid-region
region
auto | avoid | avoid-page | page | left | right | recto | verso | avoid-column | column | avoid-region | region
Specification | Status | Comment |
---|---|---|
CSS Fragmentation Module Level 3 The definition of 'break-before' in that specification. | Candidate Recommendation | Adds 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 1 The definition of 'break-before' in that specification. | Working Draft | Extends the property to handle region breaks. Adds the avoid-region and region keywords. |
CSS Multi-column Layout Module The definition of 'break-before' in that specification. | Candidate Recommendation | Initial definition. Extends the CSS 2.1 page-break-before property to handle both page and column breaks. |
Feature | Chrome | Edge | Firefox | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|---|
Basic support | No | Yes | No | 10 | 11.1 — 12.1 | No |
column and avoid-column
|
No | No | No | 10 | 11.1 — 12.1 | No |
recto and verso
|
No | No | No | No | No | No |
region and avoid-region
|
No | No | No | No | No | No |
Feature | Android webview | Chrome for Android | Edge mobile | Firefox for Android | IE mobile | Opera Android | iOS Safari |
---|---|---|---|---|---|---|---|
Basic support | No | ? | Yes | No | ? | ? | No |
column and avoid-column
|
No | ? | No | No | ? | ? | No |
recto and verso
|
No | ? | No | No | No | No | No |
region and avoid-region
|
No | ? | No | No | No | No | No |
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https://developer.mozilla.org/en-US/docs/Web/CSS/break-before