In page search/filter

Dynalist has a in-page search feature which is very useful. You type an arbitrary string, and the entire page gets filtered by that string: every bullet containing that string and its ancestors get shown, and all else gets filtered out.

It works beautifully on dynalist, very responsive, simple, and very intuitive. As you type a substring, the page gets filtered live. Such a feature would be fantastic.

This is different from filters for note body, though related: the filters for note body is similar to the filters for linked issues, which is not an arbitrary-string filter, but a link/keyword/tag on-off filter. What I’m asking for above is an arbitrary string in-page search filter.