What are the triggering methods using css transition?

The triggering methods are: 1. Triggered through the pseudo-class element ":hover", the syntax is "element {transition: attribute transition time} element:hover {attribute: attribute value}"; 2. Through "element.classList The .add("element name")" statement triggers the css transition effect.

The operating environment of this tutorial: Windows 7 system, CSS3&&HTML5 version, Dell G3 computer.

The first type: Triggered through pseudo-class elements

The second type: Triggered through JS

There must be a certain delay when added through js (delay removal has no effect) Change the style of elements

 
 
  setTimeout(() => { let element = document.getElementsByClassName('box')[0]; element.classList.add('box1') }, 1) 

Recommended learning:css video tutorial

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