Problem/Motivation
HTML tags details and summary currently cannot be used in the Help text instructions presented to the user below fields in the editing form.
To provide descriptive and human-friendly instructions to the content editors, listing specific examples can significantly improve the UX. However, providing more than 3-5 short-value examples takes up much of the UI and reduces usability. Similarly, providing links to some Help Topics documentation with examples requires the users to stop adding content and opening a new window (to avoid losing unsaved changes). Making use of standard details and summary HTML tags in the Help text would allow providing additional instruction details in a more user-friendly way by providing the relevant help information where it is needed the most, i.e. when adding the specific field content.
Steps to reproduce
The details and summary HTML tags do not get displayed in the instructions presented to the user below this field on the editing form."
Proposed resolution
Add details and summary HTML tags to the list of allowed tags in the FieldFilteredMarkup::allowedTags() (core/lib/Drupal/Core/Field/FieldFilteredMarkup.php)
/**
* Returns the allowed tag list.
*
* @return string[]
* A list of allowed tags.
*/
public static function allowedTags() {
return ['a', 'b', 'big', 'code', 'del', 'em', 'i', 'ins', 'pre', 'q', 'small', 'span', 'strong', 'sub', 'sup', 'tt', 'ol', 'ul', 'li', 'p', 'br', 'img', 'details', 'summary'];
}
Remaining tasks
Review patch.
User interface changes
Custom help text would display details and summary HTML tags to show expandable help text content.
Release notes snippet
Add details and summary HTML tags to the list of allowed tags in the FieldFilteredMarkup::allowedTags().