HTML5 ads are similar to HTML ad tags, but they come packaged as a zip file that includes all of the assets needed for the ad.
They are often visually appealing, highly animated, and interactive ads. HTML5 ads can also range in size to support desktop and mobile web.
Just like third-party HTML ad tags, HTML5 ads often have poor load performance because they contain fetch multiple files from different places, so it's crucial to test your HTML5 ads and optimize their files.