https://www.w3.org/TR/css3-selectors/

Note that the length of the first line depends on a number of factors, including the width of the page, the font size, etc.

 <style>

     P::first-line {

         text-transform: uppercase;

         color: red;

     }

 </style>

 <body>

 <P>This is a somewhat long HTML

     paragraph that will be broken into several

     lines. The first line will be identified

     by a fictional tag sequence. The other lines

     will be treated as ordinary lines in the

     paragraph.</P>

 <P>This is a somewhat long HTML

     paragraph that will be broken into several

     lines. The first line will be identified

     by a fictional tag sequence. The other lines

     will be treated as ordinary lines in the

     paragraph.</P>

https://developer.mozilla.org/en-US/docs/Web/CSS/text-transform

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