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Editorial Team
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Asked: 2026-06-11T19:45:33+00:00

I will be using Open Graph Meta on my site for sharing with Facebook.

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I will be using Open Graph Meta on my site for sharing with Facebook. I am a bit confused though. For the og tags to work it must have the following: xmlns:og="http://ogp.me/ns#" Correct?

So it comes down to two questions:

  1. Must I have the xmlns?
  2. Will it work properly if using HTML5 doctype?
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1 Answer

  1. Editorial Team

    You don’t have to use this xmlns syntax. You can use HTML5’s prefix:

    <head prefix='og: http://ogp.me/ns#'>

    Anyway, this is really just a short hand instead of having the whole namespace in each property.

    eg:

    <head prefix='og: http://ogp.me/ns#'>
    <title>Dom Perignon 1993</title>
    <meta property='og:site_name' content='Wine Site' />
    ...

    is semantically the same as 

    <head>
    <title>Dom Perignon 1993</title>
    <meta property='http://ogp.me/ns#site_name' content='Wine Site' />
    ...
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