Auto Pause/Resume Background Videos

Automatically pauses videos in background tabs and resumes when tab is active
换行
// ==UserScript==
// @name         Auto Pause/Resume Background Videos
// @namespace    kio
// @version      1.2
// @description  Automatically pauses videos in background tabs and resumes when tab is active
// @author       Kio
// @match        *://*/*
// @grant        none
// @run-at       document-start
// ==/UserScript==

(function() {
    'use strict';

    const videos = new Set();

    function handleVideo(video) {
        if (videos.has(video)) return;
        videos.add(video);

        Object.defineProperty(video, 'isplaying', {
            get: function(){
                return !!(this.currentTime > 0 && !this.paused && !this.ended && this.readyState > 2);
            }
        });

        // Pause if tab not visible
        if (document.hidden && video.isplaying) video.pause();

        // Listen to tab visibility changes
        document.addEventListener('visibilitychange', () => {
            if (document.hidden) {
                if (video.isplaying) video.pause();
            } else {
                // Resume when tab active
                if (!video.isplaying && video.readyState > 2) {
                    video.play().catch(()=>{}); // catch error if autoplay blocked
                }
            }
        });
    }

    // Observe new video elements dynamically
    const observer = new MutationObserver((mutations) => {
        mutations.forEach(m => {
            m.addedNodes.forEach(node => {
                if (node.tagName === 'VIDEO') handleVideo(node);
                else if (node.querySelectorAll) {
                    node.querySelectorAll('video').forEach(v => handleVideo(v));
                }
            });
        });
    });

    observer.observe(document, { childList: true, subtree: true });

    // Handle existing videos
    document.querySelectorAll('video').forEach(v => handleVideo(v));
})();
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