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<html><head><meta name="viewport" content="width=device-width, initial-scale=1"><style>body {font-family: "Lato", sans-serif;}.tablink { background-color: #555; color: white; float: left; border: none; outline: none; cursor: pointer; padding: 14px 16px; font-size: 17px; width: 25%;}.tablink:hover { background-color: #777;}/* Стиль содержимого вкладки */.tabcontent { color: white; display: none; padding: 50px; text-align: center;}#London {background-color:red;}#Paris {background-color:green;}#Tokyo {background-color:blue;}#Oslo {background-color:orange;}</style></head><body><p>Нажмите на кнопки внутри меню с вкладками:</p><div id="London" class="tabcontent"> <h1>London</h1> <p>London is the capital city of England.</p></div><div id="Paris" class="tabcontent"> <h1>Paris</h1> <p>Paris is the capital of France.</p></div><div id="Tokyo" class="tabcontent"> <h1>Tokyo</h1> <p>Tokyo is the capital of Japan.</p></div><div id="Oslo" class="tabcontent"> <h1>Oslo</h1> <p>Oslo is the capital of Norway.</p></div><button class="tablink" onclick="openCity('London', this, 'red')" id="defaultOpen">London</button><button class="tablink" onclick="openCity('Paris', this, 'green')">Paris</button><button class="tablink" onclick="openCity('Tokyo', this, 'blue')">Tokyo</button><button class="tablink" onclick="openCity('Oslo', this, 'orange')">Oslo</button><script>function openCity(cityName,elmnt,color) { var i, tabcontent, tablinks; tabcontent = document.getElementsByClassName("tabcontent"); for (i = 0; i < tabcontent.length; i++) { tabcontent[i].style.display = "none"; } tablinks = document.getElementsByClassName("tablink"); for (i = 0; i < tablinks.length; i++) { tablinks[i].style.backgroundColor = ""; } document.getElementById(cityName).style.display = "block"; elmnt.style.backgroundColor = color;}// Получите элемент с id="defaultOpen" и кликните по немуdocument.getElementById("defaultOpen").click();</script></body></html>