title: How do I set the start_url of a manifest.json to be the root of the site?
body: <p>I have a <code>manifest.json</code> and it has a <code>start_url</code> property that I want to point to the first file of my single page application.</p>
  
  <p>This is <code>index.html</code>, and it's the root of the site. I want this to be the <code>start_url</code>, but that file is never asked for as a URL.</p>
  
  <p>How do I point <code>start_url</code> at the relative root of the site?</p>
  
  <p>For instance, suppose the site is at <code>https://example.com</code>, what should the value of <code>start_url</code> be in <code>https://example.com/manifest.json</code>? I want the PWA to start at <code>https://example.com</code> and <strong>not</strong> <code>https://example.com/index.html</code>. The PWA might be put on a different domain, so <code>start_url</code> needs to be relative, not absolute.</p>