title: User preference client-server dialogue
body: <p>Is there any established standard, or guideline, which would specify client-server dialogue regarding preference of any parameters?</p>
  <h2>Example</h2>
  <p>Let's consider all the websites with embedded code editor.
  Regardless of website, or the editor, I'd like to be able to specify, the preference of coloring schema. Let's say monokai.</p>
  <p>Is there any standardized way of handling something like that?</p>
  <p>What I imagine is that, as a user I'd have a chrome extension in which I would specify my preferences and when I request the website, there is either the value indicating usage of code editor in the html, either server asks user if it has any preference, which I don't really see how it should work.</p>