9GAG Video Controls

Force native HTML5 controls on every video on 9GAG
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// ==UserScript==
// @name         9GAG Video Controls
// @namespace    https://9gag.com/
// @version      1.0.0
// @description  Force native HTML5 controls on every video on 9GAG
// @match        https://9gag.com/*
// @match        https://*.9gag.com/*
// @run-at       document-start
// @grant        none
// ==/UserScript==

(function () {
    'use strict';

    const injectStyle = () => {
        const css = `
            .post-container:hover .sound-toggle,
            .post-container:hover .length,
            article:hover .sound-toggle,
            article:hover .length {
                display: none !important;
            }
        `;
        const style = document.createElement('style');
        style.textContent = css;
        (document.head || document.documentElement).appendChild(style);
    };

    injectStyle();
    const ATTR_FILTER = ['controls', 'controlslist'];

    const enableControls = (video) => {
        if (!(video instanceof HTMLVideoElement)) return;
        if (!video.hasAttribute('controls')) {
            video.setAttribute('controls', '');
        }
        video.removeAttribute('controlsList');
        video.removeAttribute('disablepictureinpicture');
        video.removeAttribute('disableremoteplayback');
    };

    const attrObserver = new MutationObserver((mutations) => {
        for (const m of mutations) {
            enableControls(m.target);
        }
    });

    const attach = (video) => {
        enableControls(video);
        attrObserver.observe(video, { attributes: true, attributeFilter: ATTR_FILTER });
    };

    const processNode = (node) => {
        if (node instanceof HTMLVideoElement) {
            attach(node);
        } else if (node instanceof Element) {
            node.querySelectorAll('video').forEach(attach);
        }
    };

    const treeObserver = new MutationObserver((mutations) => {
        for (const m of mutations) {
            m.addedNodes.forEach(processNode);
        }
    });

    const start = () => {
        document.querySelectorAll('video').forEach(attach);
        treeObserver.observe(document.body, { childList: true, subtree: true });
    };

    if (document.body) {
        start();
    } else {
        document.addEventListener('DOMContentLoaded', start, { once: true });
    }
})();