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Click on the table headers to sort the table accordingly:
<p><button onclick="w3.hide('.city')">隱藏</button></p>
<p><button onclick="w3.show('.city')">顯示</button></p>
<button onclick="w3.toggleShow('.city')">Toggle Hide/Show</button><p><button onclick="w3.addStyle('#London','background-color','red')">添加樣式</button> </p>
<button onclick="w3.addClass('#London','marked')">添加類</button>
<button onclick="w3.removeClass('#London','marked')">刪除類</button>
<button onclick="w3.toggleClass('#London','marked')">切換類</button>
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