Google is in the process of adding support for automatic blocking of drive-by downloads originating from website iframes. The feature will target downloads triggered by “navigations and simulated clicks on links”” that can take place without user interaction. This could also help prevent malicious ads that are part of malvertising campaigns from pushing malicious downloads on Internet users. Google’s Yao Xiao has published the feature’s design and core principle considerations details in a public Google Docs document appropriately named “”Preventing Drive-By-Downloads in Sandboxed Iframes”””
Source: https://www.bleepingcomputer.com/news/security/google-chrome-adding-malicious-drive-by-downloads-protection/