Accessibility toggle (#825)

Author: Arhell

quickstart.html

@@ -55,7 +55,7 @@ <h4 class="panel-title">1.Install</h4>
                 <b>codeception.yml</b> and <b>tests</b> directory and default test suites.
               </p>
 
-              <a class="btn btn-primary" data-toggle="collapse" href="#bootstrap-demo" aria-expanded="false" tabindex="-1">
+              <a class="btn btn-primary" aria-controls="bootstrap-demo" role="button" data-toggle="collapse" href="#bootstrap-demo" aria-expanded="false">
                 See Demo
               </a>
 
@@ -155,7 +155,7 @@ <h4>Acceptance Testing (only)</h4>
               <pre>php vendor/bin/codecept init Acceptance</pre>
             </div>
 
-            <a class="btn btn-primary" data-toggle="collapse" href="#acceptance-demo" aria-expanded="false" tabindex="-1">
+            <a class="btn btn-primary" aria-controls="acceptance-demo" role="button" data-toggle="collapse" href="#acceptance-demo" aria-expanded="false">
               See Demo
             </a> <a href="/docs/03-AcceptanceTests" class="btn btn-secondary">Acceptance Testing Guide &raquo;</a>
 
@@ -174,7 +174,7 @@ <h4>REST API Testing (only)</h4>
             </div>
 
 
-            <a class="btn btn-primary" data-toggle="collapse" href="#api-demo" aria-expanded="false" tabindex="-1">
+            <a class="btn btn-primary" aria-controls="api-demo" role="button" data-toggle="collapse" href="#api-demo" aria-expanded="false">
               See Demo
             </a>
 
@@ -194,7 +194,7 @@ <h4>Unit Testing (only)</h4>
               <pre>php vendor/bin/codecept init Unit</pre>
             </div>
 
-            <a class="btn btn-primary" data-toggle="collapse" href="#unit-demo" aria-expanded="false" tabindex="-1">
+            <a class="btn btn-primary" aria-controls="unit-demo" role="button" data-toggle="collapse" href="#unit-demo" aria-expanded="false">
               See Demo
             </a>