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<!DOCTYPE html> <html> <style> .tooltip { position: relative; display: inline-block; border-bottom: 1px dotted black; } .tooltip .tooltiptext { visibility: hidden; width: 120px; background-color: black; color: #fff; text-align: center; border-radius: 6px; padding: 5px 0; position: absolute; z-index: 1; top: -5px; right: 110%; } .tooltip .tooltiptext::after { content: ""; position: absolute; top: 50%; left: 100%; margin-top: -5px; border-width: 5px; border-style: solid; border-color: transparent transparent transparent black; } .tooltip:hover .tooltiptext { visibility: visible; } </style> <body style="text-align:center;"> <h1>左侧工具提示 w/ 右箭头</h1> <div class="tooltip">Hover over me <span class="tooltiptext">Tooltip text</span> </div> </body> </html>