AO3 Scroll Position Tracking

Keep your place on the stories you're reading!
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// ==UserScript==
// @name            AO3 Scroll Position Tracking
// @description     Keep your place on the stories you're reading!
// @version         1.0.0
// @author          Anonymous
// @namespace       861ddd094884eac5bea7a3b12e074f34
// @license         MIT
// @require         https://update.greasyfork.org/scripts/583749/1856870/Scroll%20Position%20Tracking%20Library.js
// @match           https://archiveofourown.org/works/*
// @match           https://web.archive.org/web/*/https://archiveofourown.org/works/*
// @match           https://archive.today/*
// @match           https://archive.is/*
// @match           https://archive.ph/*
// @icon            https://external-content.duckduckgo.com/ip3/archive.transformativeworks.org.ico
// @run-at          document-end
// @inject-into     content
// @grant           none
// ==/UserScript==

/* Attribution
 ****************

   - Adapted from spin-drift's AO3 Bunker, itself adapted from code by jcunews
       https://greasyfork.org/en/scripts/567423-ao3-bunker
       https://www.reddit.com/r/userscripts/comments/1ayfnoh/add_scroll_position_to_url_is_this_possible/

*/

(async function () {
    'use strict';

    let CONFIG = {
        origins: [{
            host: 'archiveofourown.org',
            path: /^\/works(\/\d+(?:\/chapters\/\d+)?)/,
            params: [{ key: 'view_full_work', value: 'true' }]
        }],
        // Delay between ceasing scroll and saving position (ms)
        save_delay: 500,
        // Lifetime of individually cached scroll positions (days)
        ttl: 42,
        // Smooth-scroll to saved position on restore
        animate_restore: true,
        // Duration of the scroll animation (ms)
        animation_length: 1000,
        // Max waiting period for page height check (s)
        // https://backlinko.com/page-speed-stats
        timeout: 30,
        // Verbose logging
        debug: false,
    };

    await ScrollPositionTracker.init(CONFIG);
})();