The key to implementing tooltip with pure CSS is structure and hover control. 1. The HTML structure includes outer container and inner prompt box; 2. CSS sets positioning, hiding and transition effects; 3. Use the:hover status to trigger display; 4. Add arrows to optional pseudo-elements; 5. Adjust position, delay and responsive adaptation. These steps enable tooltip effects without JavaScript.
Of course, it is actually quite simple to implement a tooltip (prompt box) with pure CSS, and does not require JavaScript. As long as you master a few key points, you can easily achieve the effect of displaying prompts when hovering.

Basic structure and style
First, you have to have a basic HTML structure, such as a link or button with a title
attribute. But we want to hide the default title
and replace it with a custom tooltip.
HTML example:

<span class="tooltip">Hoom me<span class="tooltiptext">This is a prompt</span> </span>
CSS example:
.tooltip { position: relative; cursor: pointer; } .tooltiptext { visibility: hidden; width: 120px; background: #333; color: #ffff; text-align: center; border-radius: 4px; padding: 5px; /* Position above*/ position: absolute; z-index: 1; bottom: 125%; left: 50%; margin-left: -60px; /* Fade effect*/ opacity: 0; transition: opacity 0.3s; }
Display tooltip when hovering
Next is to let the tooltip display when the mouse is hovering. This is very simple, you just need to add a :hover
status.

.tooltip:hover .tooltiptext { visibility: visible; opacity: 1; }
This completes the most basic tooltip effect. You can adjust the position, color, transition animation, etc. as needed.
Optional: Add small arrow (triangle)
To make the tooltip point to the target element more intuitively, you can add a small arrow to it. This can be achieved through pseudo-element ::after
.
.tooltiptext::after { content: ""; position: absolute; top: 100%; left: 50%; margin-left: -5px; border-width: 5px; border-style: solid; border-color: #333 transparent transparent transparent; }
In this way, a small triangle will appear below the tooltip, which looks more professional.
Other practical tips
- Control display position : By modifying the values of
bottom
andleft
, the tooltip can appear above, below, left or right. - Delay display : You can use
transition-delay
to control the display time of tooltip to avoid frequent flickering. - Responsive processing : It may not be suitable for hover on the mobile terminal, so you can consider adapting with click events or media queries.
Basically that's it. Although it is not complicated, pay attention to positioning method, hierarchy (z-index) and compatibility in details. As long as the structure is clear and the style is unified, it is enough to use pure CSS to make tooltip.
The above is the detailed content of How to create a tooltip with pure CSS?. For more information, please follow other related articles on the PHP Chinese website!

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