Can Javascript somehow spy my website?
<p>If I were malicious (or malicious and thoughtless) I could add some PHP to websites I'm working (or back-end web applications I'm building) that can send some data I'm not authorised to have to my remote server. There are numerous ways to achieve that.</p>

<p>I was wondering: <strong>can Javascript do something similar</strong>?</p>

<p>For example, is it possible to be spied by using some html/css/javascript web template which will disclose informations from(about) my website - send any kind of information from my website/web app to remote server of malicious developer?</p>

<p>Thanks in advance.</p>
