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When Site Isolation is enabled, each renderer process contains documents from at most one site. This means all navigations to cross-site documents cause a tab to switch processes. It also means all cross-site iframes are put into a different process than their parent frame, using "out-of-process iframes." Splitting a single page across multiple processes is a major change to how Chrome works,
There are still some known bug ...Thanks for mentioning that. These are things I should know, but don't. I block browser support for iframes on my own sites (to stop hijacking & other issues) so I'm not accustomed to noticing anything abnormal.