The HTML4 meta[http-equiv=Content-Type] causes validation error to leak and should convert automatically to HTML5 meta[charset] · Issue #3469 · ampproject/amp-wp · GitHub
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Information Processing Fundamentals [Session6]Basic HTML grammar, editor, and meta-information
The HTML4 meta[http-equiv=Content-Type] causes validation error to leak and should convert automatically to HTML5 meta[charset] · Issue #3469 · ampproject/amp-wp · GitHub
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