Errors:
Attribute “i-amphtml-layout” not allowed on element “html” at this point.
Attribute “i-amphtml-no-boilerplate” not allowed on element “html” at this point.
Attribute “transformed” not allowed on element “html” at this point.
Attribute “amp-runtime” not allowed on element “style” at this point.
Attribute “i-amphtml-version” not allowed on element “style” at this point.
CSS: “aspect-ratio”: Property “aspect-ratio” doesn't exist.
Attribute “custom-element” not allowed on element “script” at this point.
Attribute “amp-custom” not allowed on element “style” at this point.
CSS: “max-width”: Too many values or values are not recognized.
Attribute “on” not allowed on element “a” at this point.
Attribute “on” not allowed on element “button” at this point.
Element “div” not allowed as child of element “button” in this context. (Suppressing further errors from this subtree.)
Attribute “loading” not allowed on element “img” at this point.
Warnings:
Document uses the Unicode Private Use Area(s), which should not be used in publicly exchanged documents. (Charmod C073)
The “banner” role is unnecessary for element “header”.
The “button” role is unnecessary for element “button”.
The “main” role is unnecessary for element “main”.
Consider using the “h1” element as a top-level heading only (all “h1” elements are treated as top-level headings by many screen readers and other tools).
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
United States US