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<!DOCTYPE html> <html> <head> <title></title> <style> [class*="te"]{ background: yellow; } </style> </head> <body> <div class="first-test">My first test</div> <div class="second">My second test</div> <div class="My-test">My test third</div> <div class="mytest">My test fourth</div> </body> </html>