We touched on this in a previous article, but in the interest of tl;dr, we’ll mention this again. An easy way to test the focus of your page is this:

1. Load your page and don’t look at it
2. Hit tab a bunch of times without counting
3. Look at the page and find your focus

If you can’t immediately find where the focus is on your page, chances are pretty good that others will also encounter this problem.