When button id match
<!DOCTYPE html> <html> <head> <title>Match Button Pairs Game</title> <style> .btn { padding: 10px 20px; margin: 5px; font-size: 16px; transition: all 0.3s; } .hidden { visibility: hidden; /* Makes button invisible but keeps its space */ } .selected { background-color: yellow; } </style> </head> <body> <h2>Match Score: <span id="score">0</span></h2> <button class="btn" id="btn1" onclick="handleClick('btn1')">Button 1</button> <button class="btn" id="btn1" onclick="handleClick('btn1')">Button 1</button> <button class="btn" id="btn2" onclick="handleClick('btn2')">Button 2</button> <button class="btn" id="btn2" onclick="handleClick('btn2')"...