:::demo Use attribute `content` to set the display content when hover. The attribute `placement` determines the position of the tooltip. Its value is `[orientation]-[alignment]` with four orientations `top`, `left`, `right`, `bottom` and three alignments `start`, `end`, `null`, and the default alignment is null. Take `placement="left-end"` for example, Tooltip will display on the left of the element which you are hovering and the bottom of the tooltip aligns with the bottom of the element.
To use customized theme, you will have to known where your tooltip is rendered into, if your tooltip is rendered into the root element, you will need to set the css rule globally.
It is recommended that not using linear gradient background color when you using customized theme and showing the arrow at the same time, because the popup arrow and the content are two different elements,
In fact, Tooltip is an extension based on [ElPopper](https://github.com/element-plus/element-plus/tree/dev/packages/components/popper), you can use any attribute that are allowed in ElPopper.
The `router-link` component is not supported in tooltip, please use `vm.$router.push`.
Disabled form elements are not supported for Tooltip, more information can be found at [MDN](https://developer.mozilla.org/en-US/docs/Web/Events/mouseenter). You need to wrap the disabled form element with a container element for Tooltip to work.
Although `content` property supports HTML strings, dynamically rendering arbitrary HTML on your website can be very dangerous because it can easily lead to [XSS attacks](https://en.wikipedia.org/wiki/Cross-site_scripting). So when `raw-content` is on, please make sure `content` is trusted, and **never** assign user-provided `content`.
Tooltip can also be singleton, which means you can have multiple trigger with only one tooltip instance, this function is implemented based on `Virtual triggering`
| virtual-ref | Indicates the reference element to which the tooltip is attached | HTMLElement | — | — |
| trigger-keys | When you click the mouse to focus on the trigger element, you can define a set of keyboard codes to control the display of tooltip through the keyboard | Array | — | `['Enter','Space']` |
