Optional but recommended boilerplate

The following items are not required in AMP pages, but are recommended so that you get the most SEO benefit from your web pages:

• Title tag: Title tags are used as a ranking signal in search engines, and are useful to users in identifying pages. You can add the title tag right after the AMP-JS <script> tag:

<title>Hello World!</title>

• Structured metadata: Adding structured metadata allows third-party services to more efficiently index and preview your pages. For example, Facebook uses the Open Graph Protocol, while Twitter uses Twitter Cards, to extract images and specific data about your page. Additionally, Google's Top Stories Carousel supports the schema.org Article and Video categories to generate article previews such as the ones shown in the next section.
  
  To get a structured metadata preview of your page in Google search results, you need to add code similar to this to the head of your page:

<script type="application/ld+json"> 
{ 
 "@context": "http://schema.org", 
 "@type": "NewsArticle", 
 "headline": "Article headline", 
 "image": [ 
 "thumbnail1.jpg" 
 ], 
 "datePublished": "2017-03-01T08:00:00+08:00" 
 } 
</script>