We index the contents of the pages you bookmark, but also calculate interesting metadata like word count, reading time, author and topics for articles.
You can search as you type and see results of lists, bookmarks, tags and domains.
The autocomplete results include bookmarks, lists, tags, domains and aliases.
Search within PDF documents
When you bookmark for example https://www.cdc.gov/coronavirus/2019-ncov/downloads/2019-ncov-factsheet.pdf
Then search for text which exists in this document, like “respiratory droplets” and you should see the bookmark in the results.