gistfile1.js

// youtube sizing logic

var a = m.getElementById("player"), 
    b = m.getElementById("watch7-container");
if (b && a) {
  var c = m.hasClass(b, "watch-wide"),
      b = m.lo(); // hash of width and height
  if (c) {
    var c = !!m.A("ENABLE_AUTO_LARGE"),
        d = m.hasClass(window.document.body, "site-center-aligned") && (m.hasClass(window.document.body, "watch-early-bigbear") || m.hasClass(window.document.body, "appbar-flexwatch") || m.hasClass(window.document.body, "appbar-flexwatch-mini")),
        e = m.hasClass(window.document.body, "appbar-flexwatch-mini"),
        g = m.hasClass(window.document.body, "appbar-flexwatch-540") || m.hasClass(window.document.body, "appbar-flexwatch-540-mini"),
        h = 1E3 <= b.width && b.height >= (e ? 690 : 750),
        e = d ? e ? 870 : 930 : 1040,
        b = b.width >= (d ? 1320 : 1540) && b.height >= e;
    if(c && b) {
      m.removeClass(a, ["watch-medium", "watch-medium-540", "watch-small"]);
      m.addClass(a, "watch-large");
    } else {
      if(g && h) { 
        m.removeClass(a, ["watch-small", "watch-medium", "watch-large"]);
        m.addClass(a, "watch-medium-540");
      } else { 
        m.removeClass(a, ["watch-small", "watch-medium-540", "watch-large"]);
        m.addClass(a, "watch-medium");
      }
    }
  } else {
    m.removeClass(a, ["watch-medium", "watch-medium-540", "watch-large"]);
    m.addClass(a, "watch-small");
  }
}