title: HTML/CSS input placeholder text which can be copied
body: <p>I can't seem to find anything similar to this right now, but I am pretty sure I have seen something like it before. </p>
  
  <p>I am currently able to use either input or textarea html tags and the placeholder attribute to get something close to what I want, but I also want to provide the user the ability to copy the placeholder text and enter/paste it in the same box as an entry. Is this possible?</p>
  
  <p>An use case would be a place holder of a common directory path:
  box1@mtk:/path/to/data/20180202_TextFile.txt</p>
  
  <p>I want the user to be able to copy and paste "box1@mtk:/path/to/data/" into the box so they just have to change the text file name.</p>
  
  <p>I can't force value to be the placeholder because I don't want users accidentally submitting forms without modifying all fields. </p>
  
  <p>So is it possible to have selectable / copyable placeholders?</p>