Link to explainer.
This idea is very early-stage and has not yet settled down enough for a specification.
The proposal is to create some new way of exposing DOM to the browser, that is still searchable, but is invisible. That is, find in page must be able to search within this DOM, but we shouldn't need to do all the work of layout/paint/etc.
An increasing amount of content on the web is becoming virtualized: that is, kept in memory in some non-DOM data structure, with only the visible portion converted into DOM nodes and inserted into the document. However, the non visible parts suffer because they aren’t working with some things like find-in-page, anchor navigation, etc.
Interoperability and Compatibility
This feature is very early stage and implementing it is intended to give us insight into these risks as developers experiment with it.
Edge: No signals
Firefox: No signals
Safari: No signals
Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, Chrome OS, Android, and Android WebView)?
Link to entry on the feature dashboard
Requesting approval to ship?