Errors found while checking this document as HTML5!

Result: 3 Errors, 1 warning(s)
:
: utf-8
: HTML5
Root Element: html
Root Namespace: http://www.w3.org/1999/xhtml
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Notes and Potential Issues

The following notes and warnings highlight missing or conflicting information which caused the validator to perform some guesswork prior to validation, or other things affecting the output below. If the guess or fallback is incorrect, it could make validation results entirely incoherent. It is highly recommended to check these potential issues, and, if necessary, fix them and re-validate the document.

  1. Info Using experimental feature: HTML5 Conformance Checker.

    The validator checked your document with an experimental feature: HTML5 Conformance Checker. This feature has been made available for your convenience, but be aware that it may be unreliable, or not perfectly up to date with the latest development of some cutting-edge technologies. If you find any issues with this feature, please report them. Thank you.

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Validation Output: 3 Errors

  1. Error Line 79, Column 56: Attribute content not allowed on element meta at this point. 
    <meta property="og:site_name" content="Setia Nugraha" />
    Attributes for element meta:
    Global attributes
    name
    http-equiv
    content
    charset
  2. Error Line 80, Column 45: Attribute content not allowed on element meta at this point. 
    <meta property="og:type" content="article" />
    Attributes for element meta:
    Global attributes
    name
    http-equiv
    content
    charset
  3. Error Line 83, Column 39: Bad value NextGEN for attribute name on element meta: Keyword nextgen is not registered. 
    <meta name='NextGEN' content='1.8.3' />
    Syntax of metadata name:
    A metadata name listed in the HTML specification or listed in the WHATWG wiki. You can register metadata names on the WHATWG wiki yourself.

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