​ ZERO WIDTH SPACE UTF-8 character with hex code 200B

Using HEX code of ZERO WIDTH SPACE in HTML file

<span> &#x200B; </span>

Using Decimal code of ZERO WIDTH SPACE in HTML file

<span> &#8203; </span>

Using HEX code of ZERO WIDTH SPACE in CSS file for content

span { 
    content: '\200b';
}