Mikrotik.com W3C HTML Markup Validation
HTML markup errors and warnings
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Warnings:
Content-Security-Policy HTTP header: Bad content security policy: Source list contains duplicate source expression "*.arcgisonline.com". All but the first instance will be ignored.
The “type” attribute is unnecessary for JavaScript resources.
The “type” attribute for the “style” element is not needed and should be omitted.
The “navigation” role is unnecessary for element “nav”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
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).
Errors:
Element “script” must not have attribute “async” unless attribute “src” is also specified or unless attribute “type” is specified with value “module”.
Element “script” must not have attribute “defer” unless attribute “src” is also specified.
Bad value “presentational” for attribute “role” on element “li”.
Attribute “controls” not allowed on element “a” at this point.
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