∿ SINE WAVE UTF-8 character with hex code 223F

Using HEX code of SINE WAVE in HTML file

<span> &#x223F; </span>

Using Decimal code of SINE WAVE in HTML file

<span> &#8767; </span>

Using HEX code of SINE WAVE in CSS file for content

span { 
    content: '\223f';
}