Well, it basically works just like in the example you quoted:
<a href="https://get.adobe.com/flashplayer/" target="_blank">Clique aqui para habilitar o Flash</a>
When clicking, if the default permission is to ask, a message will appear asking if it wants to enable the Flash Player.
If the default permission is to block, an icon will appear in the right corner of the browser stating that a plugin has been blocked.
If already allowed, will open the site Flash Player for download from plugin.
You may not be able to reproduce this effect because your default permission is already to allow or block. Try switching to ask permission, then the example will work.
It is a flash game server, basically redirects to the page and game runs, but with the lock of the flash the site gets black screen until it is enabled, would like to do as on the printscreen, show the user the notification to Allow Flash after clicking on a particular button that would appear if your flash was disabled
– Giovany Henrique
practical example: https://jsfiddle.net/wtzbbhLb/show/
– Giovany Henrique
It’s not my site, it’s from a forum user, and I couldn’t play it
– Giovany Henrique