Version 2.0 for accessible tab panel script and updates
This first major update now allows to execute the script on AJAX generated content. If you need to do so, you may use for example on <div id="newContent">the modal source</div>:
van11yAccessibleTabPanelAria(document.getElementById('newContent'));
This update has been published on Github/NPM (See Github repositery of Van11y tab panel script). Documentation has also been updated.
Another update: to use tab panel script, you had before to specify a href="#id_first" id="label_id_first". This is not needed anymore, the script will add ids on the fly, as kindly proposed and added by @gavboulton.
An important point: even if the requirements have been simplified, this update does not break the compatibility with previous versions. If the ids are set up, they will be overwritten by the script.