: You need xmlns="http://www.w3.org since xmlns:og and xmlns:fb are references to the xmlns - namespace. You need these because the og and fb tags are custom tags that are not part of the regular

@Shakeerah822

You need xmlns="http://www.w3.org since xmlns:og and xmlns:fb are references to the xmlns - namespace. You need these because the og and fb tags are custom tags that are not part of the regular html.
That is why the Validator doesn't like it if you omit it.

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