To improve the availability of interactive content on mobile devices, Google
began to automatically convert flash banners to HTML5. The logic is that many phones and some browsers do not support the playback of flash content, and Google preaches the concept of
universal banners , which are adapted for screens of different sizes.
An example of a mobile HTML5 banner.

In expanded form.
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Conversion from Flash to HTML5 has affected both new advertising campaigns and old campaigns. Thus, now almost all advertising on the Google Display Network is presented in a single HTML5 format.
The only exceptions are flash banners that
cannot be converted . To check whether the banner is convertible, you can upload the SWF file to the online
Swiffy converter.
By the way, using the
Google Swiffy Extension is an export to HTML5 directly from Adobe Flash Professional.

Conversion to HTML5 occurs automatically when loading banners through AdWords, AdWords Editor, or any third-party program to manage advertising campaigns.