title: why we use <html> tag although my website runs perfect without <html> tag
body: <p>I need to know what is the use of <code>&lt;html&gt;</code> tag from the beginning of the webpage although website runs perfectly without these <code>&lt;html&gt;</code> <code>&lt;/html&gt;</code> tags.</p>
  
  <p>I knew that doctype is required but why this <code>&lt;html&gt;</code> tag is required.</p>