Web Player splash screen BEFORE loading

Hi. I've searched for this answer but not found it. It may be simple from the .html file but I'm not used to looking at that either and couldn't figure it out.

Is there a way (I believe there is, so, what is it?) to export a web game, or edit the html once exported, to link to a custom jpeg/png that shows game title and "click to play" etc. I mean before the game loads up. To stop it loading in the window unless you first click this image, basically.

Note: I can easily make the first scene in the game into such a splash screen, but that requires loading the game when the web page is visited, which I'm trying to avoid.