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.
1 <style> 2 P::first-line { 3 text-transform: uppercase; 4 color: red; 5 } 6 </style> 7 <body> 8 <P>This is a somewhat long HTML 9 paragraph that will be broken into several 10 lines. The first line will be identified 11 by a fictional tag sequence. The other lines 12 will be treated as ordinary lines in the 13 paragraph.</P> 14 <P>This is a somewhat long HTML 15 paragraph that will be broken into several 16 lines. The first line will be identified 17 by a fictional tag sequence. The other lines 18 will be treated as ordinary lines in the 19 paragraph.</P>
https://developer.mozilla.org/en-US/docs/Web/CSS/text-transform
