// ==UserScript==
// @name         Video Replacement Script
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Replaces the largest video element with an iframe pointing to a local server.…
Tampermonkey: Largest video found: 
<video class="video-stream html5-main-video" style="width: 640px; height: 36…left: 0px; top: -360px;" tabindex="-1" controlslist="nodownload" src="blob:https://www.youtube…d-49f5-ac92-622dd8d86383">
debugger eval code:63:25
Tampermonkey: Video dimensions: 640 x 360 debugger eval code:65:25
Tampermonkey: Final target container selected: 
<div class="html5-video-container" data-layer="0">
debugger eval code:114:25
Tampermonkey Debug: Setting targetContainer dimensions to: 640 x 360 debugger eval code:121:29
Tampermonkey: Iframe appended. Iframe dimensions (after geometry update): 644 x 364