Just committed variant preview functionality, letting logged in users test different treatments. I started by implementing the UI for WP Admin Bar users.

Here are two treatments—two different blog headers—tested via the variant preview function:

It also prints a star on pages where a metric is recorded. I’ll be making it so that this also displays the value that would be recorded.

All of this is done for logged in users as if they were actually being recorded, but of course their choices and actions do not count towards the experiments’ stats.

Next up, displaying a separate (but similar) UI for users who are not using WP Admin Bar.