;
        stylesheet.rel = 'disabled-stylesheet';
      }
    }
    const enableStylesheet = (stylesheets) => {
      for (let i=0; i < stylesheets.length; i++) {
        const stylesheet = stylesheets[i];
        if(stylesheet.rel !== 'stylesheet') { // for Chrome, which will still FOUC without this check
          stylesheet.rel = 'stylesheet';
        }
      }
    }
    const manageTransitions = (selector, allowTransitions) => {
      const els = window.document.querySelectorAll(selector);
      for (le