transition-duration

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2015.

transition-duration CSS 屬性指定轉場動畫所需經歷的時間，以秒或是毫秒為單位。默認值為 0，表示沒有任何轉場動畫。

嘗試一下

transition-duration: 500ms;
transition-property: margin-right;

transition-duration: 2s;
transition-property: background-color;

transition-duration: 2s;
transition-property: margin-right, color;

transition-duration: 3s, 1s;
transition-property: margin-right, color;

<section id="default-example">
  <div id="example-element">Hover to see<br />the transition.</div>
</section>

#example-element {
  background-color: #e4f0f5;
  color: #000;
  padding: 1rem;
  border-radius: 0.5rem;
  font: 1em monospace;
  width: 100%;
  transition: margin-right 2s;
}

#default-example:hover > #example-element {
  background-color: #909;
  color: #fff;
  margin-right: 40%;
}

你可以指定多個時間長度，每一個時間長度都會被應用在transition-property 設定的對應屬性上(which acts as a master list.) 如果指定的時間長度的數量比對應屬性的數量少，那麼時間長度就會被重複使用。反之，多餘的時間長度就會被刪去。而這兩種情況之下的 CSS 宣告都是有效的。

語法

css

/* <time> 值 */
transition-duration: 6s;
transition-duration: 120ms;
transition-duration: 1s, 15s;
transition-duration: 10s, 30s, 230ms;

/* 全域值 */
transition-duration: inherit;
transition-duration: initial;
transition-duration: unset;

值

<time>: <time>類型表示轉場動畫從舊狀態轉至新狀態所需要的時間。如果時間長度為 0，表示沒有任何轉場，狀態之間會立即改變。若時間長度為負值則無效。

正式語法

transition-duration = 
  <time [0s,∞]>#

範例

`transition-duration: 0.5s`

<div class="parent">
  <div class="box">Lorem</div>
</div>

.parent {
  width: 250px;
  height: 125px;
}
.box {
  width: 100px;
  height: 100px;
  background-color: red;
  font-size: 20px;
  left: 0px;
  top: 0px;
  position: absolute;
  -webkit-transition-property: width height background-color font-size left top
    transform -webkit-transform color;
  -webkit-transition-duration: 0.5s;
  -webkit-transition-timing-function: ease-in-out;
  transition-property: width height background-color font-size left top
    transform -webkit-transform color;
  transition-duration: 0.5s;
  transition-timing-function: ease-in-out;
}
.box1 {
  transform: rotate(270deg);
  -webkit-transform: rotate(270deg);
  width: 50px;
  height: 50px;
  background-color: blue;
  color: yellow;
  font-size: 18px;
  left: 150px;
  top: 25px;
  position: absolute;
  -webkit-transition-property: width height background-color font-size left top
    transform -webkit-transform color;
  -webkit-transition-duration: 0.5s;
  -webkit-transition-timing-function: ease-in-out;
  transition-property: width height background-color font-size left top
    transform -webkit-transformv color;
  transition-duration: 0.5s;
  transition-timing-function: ease-in-out;
}

function updateTransition() {
  var el = document.querySelector("div.box");

  if (el) {
    el.className = "box1";
  } else {
    el = document.querySelector("div.box1");
    el.className = "box";
  }

  return el;
}

var intervalID = window.setInterval(updateTransition, 7000);

`transition-duration: 1s`

<div class="parent">
  <div class="box">Lorem</div>
</div>

.parent {
  width: 250px;
  height: 125px;
}
.box {
  width: 100px;
  height: 100px;
  background-color: red;
  font-size: 20px;
  left: 0px;
  top: 0px;
  position: absolute;
  -webkit-transition-property: width height background-color font-size left
    top -webkit-transform color;
  -webkit-transition-duration: 1s;
  -webkit-transition-timing-function: ease-in-out;
  transition-property: width height background-color font-size left top
    transform color;
  transition-duration: 1s;
  transition-timing-function: ease-in-out;
}
.box1 {
  transform: rotate(270deg);
  -webkit-transform: rotate(270deg);
  width: 50px;
  height: 50px;
  background-color: blue;
  color: yellow;
  font-size: 18px;
  left: 150px;
  top: 25px;
  position: absolute;
  -webkit-transition-property: width height background-color font-size left
    top -webkit-transform transform color;
  -webkit-transition-duration: 1s;
  -webkit-transition-timing-function: ease-in-out;
  transition-property: width height background-color font-size left top
    transform -webkit-transform color;
  transition-duration: 1s;
  transition-timing-function: ease-in-out;
}

function updateTransition() {
  var el = document.querySelector("div.box");

  if (el) {
    el.className = "box1";
  } else {
    el = document.querySelector("div.box1");
    el.className = "box";
  }

  return el;
}

var intervalID = window.setInterval(updateTransition, 7000);

`transition-duration: 2s`

<div class="parent">
  <div class="box">Lorem</div>
</div>

.parent {
  width: 250px;
  height: 125px;
}
.box {
  width: 100px;
  height: 100px;
  background-color: red;
  font-size: 20px;
  left: 0px;
  top: 0px;
  position: absolute;
  -webkit-transition-property: width height background-color font-size left top
    transform -webkit-transform color;
  -webkit-transition-duration: 2s;
  -webkit-transition-timing-function: ease-in-out;
  transition-property: width height background-color font-size left top
    transform -webkit-transform color;
  transition-duration: 2s;
  transition-timing-function: ease-in-out;
}
.box1 {
  transform: rotate(270deg);
  -webkit-transform: rotate(270deg);
  width: 50px;
  height: 50px;
  background-color: blue;
  color: yellow;
  font-size: 18px;
  left: 150px;
  top: 25px;
  position: absolute;
  -webkit-transition-property: width height background-color font-size left top
    transform -webkit-transform color;
  -webkit-transition-duration: 2s;
  -webkit-transition-timing-function: ease-in-out;
  transition-property: width height background-color font-size left top
    transform -webkit-transform color;
  transition-duration: 2s;
  transition-timing-function: ease-in-out;
}

function updateTransition() {
  var el = document.querySelector("div.box");

  if (el) {
    el.className = "box1";
  } else {
    el = document.querySelector("div.box1");
    el.className = "box";
  }

  return el;
}

var intervalID = window.setInterval(updateTransition, 7000);

`transition-duration: 4s`

<div class="parent">
  <div class="box">Lorem</div>
</div>

.parent {
  width: 250px;
  height: 125px;
}
.box {
  width: 100px;
  height: 100px;
  background-color: red;
  font-size: 20px;
  left: 0px;
  top: 0px;
  position: absolute;
  -webkit-transition-property: width height background-color font-size left top
    transform -webkit-transform color;
  -webkit-transition-duration: 4s;
  -webkit-transition-timing-function: ease-in-out;
  transition-property: width height background-color font-size left top
    transform -webkit-transform color;
  transition-duration: 4s;
  transition-timing-function: ease-in-out;
}
.box1 {
  transform: rotate(270deg);
  -webkit-transform: rotate(270deg);
  width: 50px;
  height: 50px;
  background-color: blue;
  color: yellow;
  font-size: 18px;
  left: 150px;
  top: 25px;
  position: absolute;
  -webkit-transition-property: width height background-color font-size left top
    transform -webkit-transform color;
  -webkit-transition-duration: 4s;
  -webkit-transition-timing-function: ease-in-out;
  transition-property: width height background-color font-size left top
    transform -webkit-transform color;
  transition-duration: 4s;
  transition-timing-function: ease-in-out;
}

function updateTransition() {
  var el = document.querySelector("div.box");

  if (el) {
    el.className = "box1";
  } else {
    el = document.querySelector("div.box1");
    el.className = "box";
  }

  return el;
}

var intervalID = window.setInterval(updateTransition, 7000);

規範

Specification
CSS Transitions # transition-duration-property

預設值	`0s`
Applies to	all elements, `::before` and `::after` pseudo-elements
繼承與否	no
Computed value	as specified
Animation type	Not animatable