title: Invoke button.onclick through content scripts for Chrome extension
body: <p>We are developing an Chrome extension, where in we faced the following issue.</p>
  <p>We try to access submit <code>button.onclick()</code> through content scripts.js for Chrome extensions.
  But <code>onclick()</code> event is not getting triggered while we invoke from content scripts.js.</p>
  <p>How to resolve this issue?</p>