General Actions:
Generally, HTML5 banners are classified as next generation of Adobe flash that has been struggling with security errors, huge HW load and even with permanent restrictions of several browsers (find more information HERE). Those are the reasons why new banner format, HTML5, has been developed. Majority of mobile devices supports it and HTML5 banner has positive effect with small HW load where it is displayed.
It´s development is connected with different structure and capabilities than the standard flash banner. There are tools that are able to transform banner to HTML5 type or even HTML5 banner is generated. However, it is recommended to use standard way as it is applied during creation of HTML5 website containing css style.
Following information may help you with HTML5 banner creation and specifies requests needed for uploading to iBB AdServer.
General recommendation for HTML banner creators