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Accessibility
Certain ARIA roles must be contained by particular parents: Required ARIA parents role not present: menu, menubar, group
Certain ARIA roles must contain particular children: Required ARIA children role not present: group, menuitemradio, menuitem, menuitemcheckbox
<dl> elements must only directly contain properly-ordered <dt> and <dd> groups, <script>, <template> or <div> elements
<li> elements must be contained in a <ul> or <ol>: List item does not have a <ul>, <ol> parent element without a role, or a role="list"
Links must have discernible text: Element has no title attribute
Compatibility
'-ms-filter' is not supported by Chrome, Chrome Android. Add 'filter' to support Chrome 53+, Chrome Android 53+.
'-ms-text-size-adjust' is not supported by Chrome, Chrome Android, Edge, Firefox, Safari. Add 'text-size-adjust' to support Chrome 54+, Chrome Android 54+, Edge 79+.
'-webkit-text-size-adjust' is not supported by Chrome, Chrome Android, Edge 79+, Firefox, Safari. Add 'text-size-adjust' to support Chrome 54+, Chrome Android 54+, Edge 79+.
'-webkit-print-color-adjust: exact' is not supported by Chrome, Chrome Android, Edge.
'content-type' header charset value should be 'utf-8'.
'content-type' header media type value should be 'text/html', not 'image/jpeg'.
Performance
A 'cache-control' header contains directives with invalid values: 'no-cache="set-cookie"'
A 'cache-control' header is missing or empty.
Security
Response should include 'x-content-type-options' header.
The 'Expires' header should not be used, 'Cache-Control' should be preferred.
Other
'box-shadow' should be listed after '-webkit-box-shadow'.
CSS inline styles should not be used, move styles to an external CSS file

//hier folgen noch ein halbes Dutzend Hinweise auf CSS-Fehler, die sich aber alle auf Formatierungen beziehen / keinen Datei-Bezug