Small font is used to define small formatting. For small formatting, use the HTML <small> tag. The text inside the <small>…</small> tag will get a smaller font.
Just keep in mind to use the <small>...</small> tag inside the <p>…</p> tag.
Example
You can try the following code to use small formatting in an HTML page
<!DOCTYPE html> <html> <head> <title>HTML small font</title> </head> <body> <h1>Heading</h1> <p> This is demo text<br> <small> This text will be smaller </small> </p> </body> </html>