title: What is initial scale, user-scalable, minimum-scale, maximum-scale attribute in meta tag?
body: <p>I was going through the source code of a website and found this piece of code.</p>
  
  <pre><code>&lt;meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=1.0, minimum-scale=1.0, maximum-scale=1.0"&gt;
  </code></pre>
  
  <p>I want to know what this initial scale, user-scalable, minimum-scale, maximum-scale are and what does those values mean? And also tell me what all values they accepts.</p>