On mobile devices, we have an alphabet scroll thumb. What is an appropriate substitute for a web page viewed on a desktop? I don't want to interfere with the native scroll bar or overwhelm the interface with awkward navigational queues next to it.
I'm after generic advice as well as some that applies specifically to my scenario: corpus search for linguistic analysis. They want their searches for a particular term usage to produce literally hundreds or thousands of results on the same page, sorted by right collocates (words following the search term) alphabetically. Drill-down, data segmentation and grouping have all been discussed (and then discarded) for reasons beyond my understanding of linguists' needs.
A sticky A-Z bar with a progress indicator seems kosher (think stretched-out Discourse "finite scrolling" indicator at the bottom right of your screen; also note the URL update neatness when scrolling!), is there a conventional approach here?