<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>Example of attribute selector</title> <style> [class*="warning"] { color: yellow; background: red; } </style> </head> <body> <p class="warning">This is a frist paragraph.</p> <p class="alert warning">This is a second paragraph .</p> <p class="alert-warning">This is a most important paragraph.</p> <p class="alert_warning">This also very important paragraph.</p> <p class="highlight">This is a last paragraph.</p> </body> </html>