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htmlseomultiple-languages

proper use link hreflang

I use below link tag for multiple language, have two question

  1. should I add <link href="http://domain.com/" rel="canonical"> in url http://domain.com/?hl=en or http://domain.com/?hl=es?
  2. should I add <html lang='en'> in url http://domain.com/?hl=en and <html lang='es'> in http://domain.com/?hl=es?
<head>
  <!-- … -->
  <link href="http://domain.com/" hreflang="x-default" rel="alternate">
  <link href="http://domain.com/?hl=en" hreflang="en" rel="alternate">
  <link href="http://domain.com/?hl=es" hreflang="es" rel="alternate">
</head>
Solution
    1. should I add < link href="http://domain.com/" rel="canonical" > in url http://domain.com/?hl=en or http://domain.com/?hl=es?

    Neither, you can use:

    <link href="http://domain.com/" rel="canonical"> in http://domain.com/
<link href="http://domain.com/?hl=en" rel="canonical"> in http://domain.com/?hl=en
<link href="http://domain.com/?hl=es" rel="canonical"> in http://domain.com/?hl=es
    1. should I add < html lang='en' > in url http://domain.com/?hl=en or http://domain.com/?hl=es?

    You can put it in http://domain.com/?hl=en, but not in http://domain.com/?hl=es