In January of 2015, YouTube changed its default player from Flash to HTML5. In June 2016, Google AdWords changed their default from Flash to HTML5, and in January 2017, ads in the Flash format will no longer run. Google Chrome will also have HTML5 as the default by the end of 2016. FireFox and Internet Explorer Edge are following Chrome’s lead, with Firefox rolling out HTML5 at the beginning of 2017 and Internet Explorer Edge doing the same that summer.
The big rush for browsers changing their support has been led by Flash’s extensive security issues over the past 2 years.
What does this mean for me?
If your site is using Adobe Flash, each time a user comes to your site they will be prompted to run flash by clicking to play.