tabindex, style :focus et bug associés pour accesibilité clavier (et visuelle au passage)

js/events.js

@@ -39,9 +39,12 @@ function createEntry(title, date, html, style){
   const newEntry = document.createElement('details');
   const newSummary = document.createElement('summary');
   newSummary.append(title, date);
+  newSummary.setAttribute('tabindex', '0');
 
   newEntry.append(newSummary);
 
+  html.setAttribute('tabindex', '-1');
+
   newEntry.append(html);
 
   newEntry.name = "eventList"