details.css in Drupal 8

Collapsible details.

See also

collapse.js

http://nicolasgallagher.com/css-background-image-hacks/

File

core/themes/classy/css/components/details.css

/**
 * @file
 * Collapsible details.
 *
 * @see collapse.js
 * @see http://nicolasgallagher.com/css-background-image-hacks/
 */

details {
  margin-top: 1em;
  margin-bottom: 1em;
  border: 1px solid #ccc;
}
details > .details-wrapper {
  padding: 0.5em 1.5em;
}
/* @todo Regression: The summary of uncollapsible details are no longer
     vertically aligned with the .details-wrapper in browsers without native
     details support. */
summary {
  padding: 0.2em 0.5em;
  cursor: pointer;
}