What prevents me from using $.ajax to load another domain's html?

Question

My domain:

Answer 1

There are Four ways to get around Same Origin Policy

1. Proxy - You request it from your server, your server requests it from other domain, your server returns it to the browser
2. Flash cross domain policy - other domain must add a crossdomain.xml file to their site
3. Cross domain HTTP header - other domain must add an Access-Control-Allow-Origin header to their page
4. JSONP - It's a json web service that provides a callback function. Other domain must implement this.

Note: The ONLY way to do it without the other domain's help is #1, routing it through your own server.