title: Standardized way of graying out normal HTML text
body: <p>Is there a standardized way of graying (greying) out text that is meant to be ignored, either in HTML, or bootstrap?</p>
  
  <p>I tried looking at both how Slack styles the "(edited)" text, and how Twitter itself (twitter.com) styles timestamps, and it seems they just change the font color. It just seems strange to me that an arbitrary font color is chosen without any semantic information is attached to it, or even a standardized shade of gray.</p>
  
  <p>The <a href="http://getbootstrap.com/css/#less-variables-colors" rel="noreferrer">bootstrap documentation</a> mentions some semantic colors, but gray isn't included in them - gray is only mentioned in grayscale.</p>