This is just a chess website opener that open Chess.com / lichess.org in browser in minimal mode.

Without browser-toolbar, or browser-menubar, or browser-anything-else.

Just to help you to get a better layout when using OBS to record or stream.

See this Chess.com screenshot, lichess.org screenshot, OBS layout screenshot.

(Notice: If you open a new window in minimal mode, it still opens with normal mode of browser)
Chess.com
/
lichess.org

It will just open chess website with this:

window.open(url, '_blank', 'toolbar=no, menubar=no, width=1500, height=920, noopener=yes');

Or, custom your prefer size (in px):