Improvements to Themis bar prep website (set video speeds; turn on captions; indent outline properly)

Themis-tweaks.js

// ==UserScript==
// @name         Themis Tweaks
// @namespace    https://github.com/vincekd
// @version      0.1
// @description  Set video speeds; turn on captions; indent outline properly
// @author       https://github.com/vincekd
// @match        https://www.themisbar.com/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=themisbar.com
// @run-at       document-end
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    function onLoad(event, element) {
        // set playback rate to 1.75/check local storage
        element.playbackRate = parseFloat(window.localStorage.getItem("vkd-playback-rate") || 1.75, 10);
        // turn on captions
        element.parentNode.querySelector(".fp-subtitle-menu [data-subtitle-index='0']").click();
        // enable fullscreen
        // element.parentNode.querySelector(".fp-fullscreen").click();
        // add better speeds
        insertSpeeds(element);
    }

    function insertSpeeds(e) {
        const speeds = [1.25, 1.75, 2.5];
        const speedMenu = e.parentNode.querySelector(".fp-speed-menu");
        speeds.forEach(speed => {
            const a = document.createElement("a", {"className": ".fp-speed-menu"});
            a.setAttribute("data-speed", speed);
            a.textContent = speed;
            const prev = Array.of(...speedMenu.querySelectorAll("a")).find(sp => parseFloat(sp.getAttribute("data-speed"), 10) >= speed);
            if (!prev) {
                speedMenu.appendChild(a);
            } else if (parseFloat(prev.getAttribute("data-speed"), 10) !== speed) {
                speedMenu.insertBefore(a, prev);
            }
        });
    }

    function setVideoSettings() {
        document.querySelectorAll("video").forEach(e => {
            e.addEventListener("loadeddata", event => { onLoad(event, e); }, false);
            e.addEventListener("ratechange", event => {
                window.localStorage.setItem("vkd-playback-rate", e.playbackRate);
            }, false);
        });
    }

    function setOutlineSettings() {
        // underline/indent sub-headers
        const headers = ["[0-9]+\\.", "[a-z]+\\.", "[0-9]+\\)", "[a-z]+\\)", "[ivx]+\\)"];
        document.querySelectorAll("#outlineContent p").forEach(e => {
            if (/^[a-zA-Z0-9]+[\)\.]\s+/.test(e.textContent.trim())) {
                if (/\:$/.test(e.previousElementSibling.textContent.trim()) || (e.previousElementSibling.classList.contains("vkd-list-item") &&
                                                                                /;( (and|or))?$/.test(e.previousElementSibling.textContent.trim()))) {
                    e.classList.add("vkd-list-item");
                } else {
                    e.classList.add("vkd-header");
                    const index = headers.findIndex(reg => (new RegExp("^" + reg)).test(e.textContent.trim()));
                    e.classList.add("vkd-header-h" + (index + 1));
                }
            }
        });
    }

    setTimeout(setOutlineSettings, 250);
    setVideoSettings();
})();