LatBel

Userscript for audio background (YouTube and YouTube music)
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// ==UserScript==
// @name         LatBel
// @namespace    http://tampermonkey.net/
// @version      1.6
// @description  Userscript for audio background (YouTube and YouTube music)
// @author       dehacking_guy
// @license      MIT
// @match        *://*/*
// @grant        none
// @run-at       document-start
// ==/UserScript==

(function() {
    'use strict';

    // 1. Block tab switching detection completely
    Object.defineProperty(document, 'hidden', {value: false, writable: false});
    Object.defineProperty(document, 'visibilityState', {value: 'visible', writable: false});

    const blockEvent = (event) => event.stopImmediatePropagation();
    ['visibilitychange', 'webkitvisibilitychange', 'pagehide', 'blur'].forEach(evt => {
        window.addEventListener(evt, blockEvent, true);
    });

    // 2. Aggressive Playback Enforcement
    document.addEventListener('pause', (event) => {
        const target = event.target;
        
        if (target && target.tagName === 'VIDEO') {
            if (!document.hasFocus()) {
                
                let attempts = 0;
                // Try to force play every 500ms
                const forcePlay = setInterval(() => {
                    attempts++;
                    target.play().then(() => {
                        // If successful, stop the loop
                        clearInterval(forcePlay); 
                    }).catch(err => {
                        console.warn('Screen-off auto-play blocked by OS:', err);
                    });

                    // Give up after 10 attempts (5 seconds) to prevent crashing the page
                    if (attempts >= 10) {
                        clearInterval(forcePlay);
                    }
                }, 500);
            }
        }
    }, true);
})();