title: Why can Chrome execute javascript on other pages but I can't?
body: <p>Apologies if this is a roundabout way of asking this question, but I am a little confused about how the web and javascript work. </p>
  
  <p><strong>What I want to do:</strong> execute javascript on all pages of a list of urls I have found. (Specifically use jquery to pull info from them)</p>
  
  <p><strong>Problem</strong> I can't execute Javascript on these pages because they aren't mine and don't have the Access-Control-Allow-Origin header. So I can't load them (with AJAX) in order to use JQuery on them.</p>
  
  <p><strong>BUT</strong> Google Chrome can both load pages and execute javascript on them (with their developer's console). So if I wanted too, I could go to each page, open the developers console, and pull the information from there. If there's nothing stopping Chrome from accessing these, then why am I stopped? And, is there a way around this?</p>
  
  <p>Thank you, and I hope my description makes sense. I've been researching this for a while but have found nothing that explains how seemingly inconsistent CORS is.</p>