f LATIN SMALL LETTER F UTF-8 character with hex code 0066

Using HEX code of LATIN SMALL LETTER F in HTML file

<span> &#x0066; </span>

Using Decimal code of LATIN SMALL LETTER F in HTML file

<span> &#102; </span>

Using HEX code of LATIN SMALL LETTER F in CSS file for content

span { 
    content: '\0066';
}