с SMALL LETTER ES UTF-8 character with hex code 0441

Using HEX code of SMALL LETTER ES in HTML file

<span> &#x0441; </span>

Using Decimal code of SMALL LETTER ES in HTML file

<span> &#1089; </span>

Using HEX code of SMALL LETTER ES in CSS file for content

span { 
    content: '\0441';
}