This morning, Adobe announced their plans to end support for Flash in late 2020. For Flash developers this will mean transitioning to HTML, as Chrome will increasingly require explicit permission from users to run Flash content until support is removed completely at the end of 2020.
HTML is faster, safer, and more power efficient than Flash and works across desktop and mobile. Three years ago, over 80% of Chrome daily desktop users visited sites with Flash. Today only 17% of users visit sites with Flash and we’re continuing to see a downward trend as sites move to HTML.
https://blog.chromium.org/2017/07/so-long-and-thanks-for-all-flash.html
https://blogs.adobe.com/conversations/2017/07/adobe-flash-update.html