Browsers tested: Firefox 28 and Chromium 29, both on Ubuntu 13.10.

What I did:

1. I went to https://en.wikipedia.org/

What happened:

1. For a split second:
   • The "Navigation" heading is displayed
   • The other headings are
2. Then the "Navigation" heading disappears and the other headings get arrows and some of their content is collapsed

Expected result:

• No flickering, especially not just around the logo.

I realize that it's impossible to run all JS at once and that some flickering therefore is unavoidable. However, it should be easy to hide the "Navigation" heading instantly with something like:

.client-js #p-navigation-label { display: none; }

And maybe even instead of:

#mw-panel.collapsible-nav .portal

use

.client-js #mw-panel .portal

Version: 1.23.0
Severity: normal