css transition-delay attribute is used to specify when the transition effect starts. The transition-delay value is in seconds or milliseconds. The syntax is transition-delay: time.

How to use the css transition-delay property?
Function: The transition-delay attribute specifies when the transition effect starts. The transition-delay value is in seconds or milliseconds.
Syntax:
transition-delay: time
Description:
time Specifies the time to wait before the transition effect starts, in seconds or milliseconds.
Note:
Internet Explorer 10, Firefox, Opera and Chrome support the transition-delay attribute.
Safari supports an alternative -webkit-transition-delay property.
Note:
Internet Explorer 9 and earlier browsers do not support the transition-delay attribute.
css transition-delay property usage example
<!DOCTYPE html>
<html>
<head>
<style>
div
{
width:100px;
height:100px;
background:blue;
transition-property:width;
transition-duration:5s;
transition-delay:2s;
/* Firefox 4 */
-moz-transition-property:width;
-moz-transition-duration:5s;
-moz-transition-delay:2s;
/* Safari and Chrome */
-webkit-transition-property:width;
-webkit-transition-duration:5s;
-webkit-transition-delay:2s;
/* Opera */
-o-transition-property:width;
-o-transition-duration:5s;
-o-transition-delay:2s;
}
div:hover
{
width:300px;
}
</style>
</head>
<body>
<div></div>
<p>请把鼠标指针移动到蓝色的 div 元素上,就可以看到过渡效果。</p>
<p><b>注释:</b>过渡效果会在开始前等待两秒钟。</p>
<p><b>注释:</b>本例在 Internet Explorer 中无效。</p>
</body>
</html>Effect output:

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