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<!DOCTYPE html> <html> <head> <style> [class*="test"] { background: #ffff00; } </style> </head> <body> <div class="first_test">The first div element.</div> <div class="second">The second div element.</div> <div class="test">The third div element.</div> <p class="test">This is some text in a paragraph.</p> </body> </html>