\ REVERSE SOLIDUS UTF-8 character with hex code 005C

Using HEX code of REVERSE SOLIDUS in HTML file

<span> &#x005C; </span>

Using Decimal code of REVERSE SOLIDUS in HTML file

<span> &#92; </span>

Using HEX code of REVERSE SOLIDUS in CSS file for content

span { 
    content: '\005c';
}