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给 youtube 的字幕区域增加活动区域 aria-live 属性，以便于屏幕阅读器自动朗读外挂字幕
// ==UserScript==
// @name youtube 字幕区域优化
// @namespace https://www.zhihu.com/people/yin-xiao-bo-11
// @version 0.1.2
// @description 给 youtube 的字幕区域增加活动区域 aria-live 属性，以便于屏幕阅读器自动朗读外挂字幕
// @author Veg
// @include https://www.youtube.com/*
// @grant none
// ==/UserScript==
(function() {
'use strict';
let mo = new MutationObserver( (mutationRecord) => {
middleFunction();
});
mo.observe(document.body, {
'childList': true,
'subtree': true
});
middleFunction();
function middleFunction() {
let caption = document.querySelector('div.ytp-caption-window-container');
if (caption) {
caption.setAttribute('aria-live', 'assertive');
}
}
})();