title: How to manually load an ftplugin after startup in Vim?
body: <p>Say I load a .txt file into Vim. Then I want to change the <code>filetype=html</code> but I also want an associated ftplugin loaded. How can I do this?</p>
  
  <p>I've tried stuff like: <code>:set filetype plugin on</code> and <code>:set filtype plugin_name</code> on and also <code>:filetype plugin_name</code> on etc etc., but I can't seem to manually load the ftplugin. Any suggestions? </p>
  
  <p>I've tried <code>:filetype=html</code> and then <code>:filetype plugin on</code> and other combinations to no avail.</p>
  
  <p>EDIT: I was not able to "completely" solve this with any of the answers (but it maybe something individual to my configuration). However, Pierre's answers were pretty darn good so I'm giving him the green check mark. </p>