⧯ ERROR-BARRED BLACK SQUARE UTF-8 character with hex code 29EF

Using HEX code of ERROR-BARRED BLACK SQUARE in HTML file

<span> &#x29EF; </span>

Using Decimal code of ERROR-BARRED BLACK SQUARE in HTML file

<span> &#10735; </span>

Using HEX code of ERROR-BARRED BLACK SQUARE in CSS file for content

span { 
    content: '\29ef';
}