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Showing content from https://webplatform.github.io/docs/css/properties/region-fragment below:

region-fragment · WebPlatform Docs

region-fragment Summary

Controls whether the last region in a chain displays additional ‘overset’ content according its default overflow property, or if it displays a fragment of content as if it were flowing into a subsequent region.

Overview table

Initial value: auto
Applies to: CSS Regions
Inherited: No
Media: visual
Computed value: specified value
Animatable: No
CSS Object Model Property: regionFragment
Percentages: N/A

Syntax

region-fragment: auto
region-fragment: break

Values

auto: Region element displays overset content according to its overflow property.
break: Region element overrides overflow property, displaying whatever fragment of overset content can fit within the region.

Examples

<style>
  article {
    flow-into: article-flow;
  }
  #region-1, #region-2 {
    flow-from: article-flow;
    region-fragment: break; /* or auto */
    overflow: visible; /* or hidden */
  }
</style>

<body>
  <article>...</article>
  <div id="region-1"></div>
  <div id="region-2"></div>
</body>

Usage

 In the following example, 'region_1' can accommodate the article's gray text, 'region_2' can  accommodate the blue text, and the red  'overset' text does not fit within the region chain:

Setting region-fragment to break suppresses display of the overset text, as shown in the example at the bottom. Setting region-fragment to its default auto value makes overset content display according to whatever overflow property is defined, as shown in the two examples on the right. Even overflow:hidden may display part of the first line of overset text.

The property only applies to the final element in a region chain that is not large enough to accomodate remaining content. To behave as a 'region’, the element’s flow-from must specify a named flow, and display content from a corresponding flow-into.

For an overview of CSS Regions, see Using CSS Regions to flow content through a layout.

Notes

This property was formerly named region-overflow.

Related specifications

CSS Regions Module Level 1: W3C Working Draft