undefined tag

💾 replit

:not(:defined) { 
    display: block; 
    width: 120px; 
    border-bottom: 2px dotted red; 
    text-align: center;
    background-color: hsla(60, 80%, 50%, 0.4);
} 

:not(:defined):before { 
    content: "undefined <tag>"; 
    color: red; 
}

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