LayoutTests/fast/forms/button-first-line-first-letter.html - external/github.com/WebKit/webkit - Git at Google

 <!DOCTYPE html>
 <style>
   .line::first-line { color: red }
   .letter::first-letter { color: green; }
 </style>

 <button class=line>
   First line should be red<br>
   This is the second line.
 </button>

 <button class=letter>
   First letter should be green<br>
   This is the second line.
 </button>
	<!DOCTYPE html>
	<style>
	.line::first-line { color: red }
	.letter::first-letter { color: green; }
	</style>

	<button class=line>
	First line should be red<br>
	This is the second line.
	</button>

	<button class=letter>
	First letter should be green<br>
	This is the second line.
	</button>