title: How to make inactive content inside a div?
body: <p>How to make content in some <code>div</code> block inactive using JavaScript?</p>
  
  <p>Let's say there is a button with command "Enable / Disable". And there is one div block with some text. When pushing button "Enable / Disable", is it is "Enable", you can work with content inside, but when "Disable", you can't work with content inside div block.</p>
  
  <p>I imagine in order to make inactive content inside div block, we need to put another layer upon that will prevent from editing content on the content div block.</p>
  
  <p>I'm getting confused how to realize this kind of feature.</p>