Adding region metadata to your THEMENAME.info.yml file
Printing the region as a Twig variable in your page.html.twig file (and page template variants)
Important Note: If you declare any regions in your theme, even just one, all the default regions will no longer be applied and you assume responsibility for declaring any and all regions you want to use.
More semantic HTML5 elements were added for better support assistive technology. We have supplemented this with WAI-ARIA elements such as landmarks, live regions, roles & properties.
Aural Alerts
Drupal.announce() is now part of Drupal Core with core/misc/announce.js so that users can confidently provide timely messages to aural users. In JavaScript we can now provide instructions to screen reader users to be read out either as assertive or polite:
When creating a custom content type the first step is to set the base configuration for the content type. After that you may optionally add one or more fields.
