I found a bug in mobile (Android Chrome) When clicking on a link in the summary panel, the panel will disappear, but the main content will not move back to the left. You have to click on the menu button to get the summary panel back. Clicking explicitly on the menu button again will move the main content to the left like it should do.
For example, moving a slider to the left end, it is very difficult to grab the slider from there.
This state will not be fixed even if you reopen the browser.
Because the state is saved in "localStorage".
I think that it is better to save to "sessionStorage".