Constantly updating flash
Due to lack of Flash support on mobile devices (particularly i OS devices), decreased support in many browsers, poor accessibility, and general transition away from Flash as a commonly-used web technology, using Flash is not generally recommended.
Nearly all of the concepts that affect HTML accessibility can also apply to Flash.
These include providing plenty of contrast, consistent navigation, understandable language, etc.
Here are some specific strategies to make Flash accessible to different disability types: Although each of these strategies can increase accessibility, Flash content is rarely designed to include all of these strategies at the same time.
As such, nearly all Flash content on the web poses notable accessibility issues for many users with disabilities.
When all accessibility techniques are applied to Flash, it can be made accessible on platforms that support Flash and Flash accessibility, perhaps even more so than HTML, because the need for specific assistive technologies (with their accompanying limitations) is removed.