add button to start presentation

Instead of automatically starting after selecting a file.
This pleases Chrome's popup blocker, which no longer blocks it.
Firefox isn't smart enough to establish the click causality link though.

1 files changed, 3 insertions, 0 deletions

diff --git a/index.html b/index.html
index 68239ff..61c53fc 100644
--- a/index.html
+++ b/index.html
@@ -70,6 +70,9 @@
         </p>
 
         <input id="fileInput" type="file" multiple="false" accept="application/pdf" />
+        <br />
+        <br />
+        <input id="startButton" type="button" value="Start presentation" disabled />
       </div>
     </div>