๐พ 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; }
<my-element></my-element>
pseudo-class
Last updated 3 years ago