diff --git a/src/web/HTMLCategory.mjs b/src/web/HTMLCategory.mjs
index 0414fd71..bb0581be 100755
--- a/src/web/HTMLCategory.mjs
+++ b/src/web/HTMLCategory.mjs
@@ -39,7 +39,7 @@ class HTMLCategory {
      */
     toHtml() {
         const catName = "cat" + this.name.replace(/[\s/\-:_]/g, "");
-        let html = `<div class="panel category">
+        let html = `<div class="panel category" tabIndex="0">
         <a class="category-title" data-toggle="collapse" data-target="#${catName}">
             ${this.name}
         </a>
diff --git a/src/web/HTMLOperation.mjs b/src/web/HTMLOperation.mjs
index ae61b58d..81ccd821 100755
--- a/src/web/HTMLOperation.mjs
+++ b/src/web/HTMLOperation.mjs
@@ -46,7 +46,7 @@ class HTMLOperation {
      * @returns {string}
      */
     toStubHtml(removeIcon) {
-        let html = "<li class='operation'";
+        let html = "<li tabIndex='0' class='operation'";
 
         if (this.description) {
             const infoLink = this.infoURL ? `<hr>${titleFromWikiLink(this.infoURL)}` : "";