• Via W3C HTML Validation Service site:

    1. Error: Attribute “type” not allowed on element “iframe” at this point.
    2. Error: Attribute “webkitallowfullscreen” not allowed on element “iframe” at this point.
    3. Error: Attribute “mozallowfullscreen” not allowed on element “iframe” at this point.
    4. Error: The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.

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