Official Statement From Adobe
In the official statement from Adobe, in July 2017, they stated "In collaboration with several of our technology partners - including Apple, Facebook, Google, Microsoft and Mozilla, Adobe is planning to end-of-life Flash. Specifically, we will stop updating and distributing the Flash Player at the end of 2020 and encourage content creators to migrate any existing Flash content to these new open formats."
Google and Microsoft have announced that they will disable the plug-in by default in their browsers by early 2020.
Chrome will continue phasing out Flash over the next few years, first by asking for your permission to run Flash in more situations, and eventually disabling it by default. We will remove Flash completely from Chrome toward the end of 2020.
If you regularly visit a site that uses Flash today, you may be wondering how this affects you. If the site migrates to open web standards, you shouldn’t notice much difference except that you'll no longer see prompts to run Flash on that site. If the site continues to use Flash, and you give the site permission to run Flash, it will work through the end of 2020.
What is Flash?
Flash is a multimedia software platform used to produce animations, desktop applications, and mobile games and applications. Flash graphics and animations are viewed in a browser through use of Flash Player, and AIR and some third-party players are used for viewing desktop and mobile apps.
What should I do with Flash content?
As of 2020, any flash content may no longer work properly. So instead it's important to create an action plan for conversion to HTML5
What is HTML5?
HTML, which stands for Hypertext Markup Language is a markup language used by the World Wide Web, and the "5" after HTML just means that it's is the fifth generation of the HTML standard. It's basically just the coding language that allows us to see stuff online. What if you already have courses, animations, ads, apps and other content published in Flash? Now appears to be the time to start looking at devising a plan to convert courses and other content to HTML5, which will address new modern designs. HTML5 is mobile ready and responsive so content will automatically adjust on different mobile devices with regards to sizing and usability.
How do I convert my content from Flash to HTML5?
If you have source files for your content on-hand, check your existing development tools to see if there are publishing options to publish in HTML5.
Try publishing as HTML5 and then test thoroughly to determine if the output is successful.
Remember to test on both mobile and desktop devices. If your content does not convert successfully, you may need to revamp portions of your asset, or you may need to replace the entire program.