HTML5 video
Support for HTML5 video has been steadily increasing. In June 2013, Netflix added support for HTML5 video. In January 2015, YouTube switched to using HTML5 video instead of Flash by default. In December 2015, Facebook switched from Flash to HTML5 for all video content.
Adobe Flash
The following tools allow running Flash content in web browsers using HTML5:Websites built with Adobe Flash will not function on most modern mobile devices running Google Android or iOS (iPhone, iPad). The only alternative is using HTML5 and responsive web design to build websites that support both desktop and mobile devices.