@wordpress/block-library/build-module/embed/constants.js

// These embeds do not work in sandboxes due to the iframe's security restrictions.
export var HOSTS_NO_PREVIEWS = ['facebook.com', 'smugmug.com'];
export var ASPECT_RATIOS = [// Common video resolutions.
{
  ratio: '2.33',
  className: 'wp-embed-aspect-21-9'
}, {
  ratio: '2.00',
  className: 'wp-embed-aspect-18-9'
}, {
  ratio: '1.78',
  className: 'wp-embed-aspect-16-9'
}, {
  ratio: '1.33',
  className: 'wp-embed-aspect-4-3'
}, // Vertical video and instagram square video support.
{
  ratio: '1.00',
  className: 'wp-embed-aspect-1-1'
}, {
  ratio: '0.56',
  className: 'wp-embed-aspect-9-16'
}, {
  ratio: '0.50',
  className: 'wp-embed-aspect-1-2'
}];
export var DEFAULT_EMBED_BLOCK = 'core/embed';
export var WORDPRESS_EMBED_BLOCK = 'core-embed/wordpress';
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