<!DOCTYPE html> <html> <head> <title>CSS Variables Test: custom property names are case-sensitive</title> <meta charset="UTF-8"> <link rel="author" title="Noah Collins" href="mailto:noahcollins@gmail.com"> <style type="text/css"> .blue-good-1 { color: #22e; } .blue-good-2 { color: #22e; } </style> </head> <body> <h2 class="blue-good-1">Valid CSS Variable Names</h2> <p class="blue-good-1">This paragraph is styled using a valid CSS Variable name. It should be blue.</p> <p class="blue-good-2">This paragraph is styled using a valid CSS Variable name. It should be blue.</p> <br> <h2>Invalid CSS Variable Names</h2> <p>This paragraph is styled using an invalid CSS Variable name. Fail if red.</p> <p>This paragraph is styled using an invalid CSS Variable name. Fail if red.</p> </body> </html>