Accessibility over ARIA

According to an audit made over Accessibility, there are few violations on some ARIA attributes and its values on the admin tree when a new learning activity is created (e.g. Assignment)

Steps to replicate:

Log in as Teacher/Admin

• Access Course
• Click 'Create new learning activity'
• Choose any (e.g. Assignment)
• Access Tags section and Inspect (See below screenshot as reference)

 The childs items from

<div class="form-autocomplete-selection form-autocomplete-multiple" id="form_autocomplete_selection-1517584605877" role="list" aria-atomic="true" tabindex="0" aria-multiselectable="true">

Which are:

<span class="accesshide">Selected items:</span>

<span>No selection</span>

Doesn't have the role="listitem" on them.

And it is from this two files:

• moodle/lib/templates/form_autocomplete_selection.mustache
• moodle/theme/boost/templates/core/form_autocomplete_selection.mustache