transform-origin

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.

CSS 內的**transform-origin**屬性可以設定元素變化的原點。

嘗試一下

變化原點指的是應用變化的點。舉例來說， rotate()函數的原點為旋轉中心。 (This property is applied by first translating the element by the negated value of the property, then applying the element's transform, then translating by the property value.)

語法

css

/* One-value syntax */
transform-origin: 2px;
transform-origin: bottom;

/* x-offset | y-offset */
transform-origin: 3cm 2px;

/* x-offset-keyword | y-offset */
transform-origin: left 2px;

/* x-offset-keyword | y-offset-keyword */
transform-origin: right top;

/* y-offset-keyword | x-offset-keyword */
transform-origin: top right;

/* x-offset | y-offset | z-offset */
transform-origin: 2px 30% 10px;

/* x-offset-keyword | y-offset | z-offset */
transform-origin: left 5px -3px;

/* x-offset-keyword | y-offset-keyword | z-offset */
transform-origin: right bottom 2cm;

/* y-offset-keyword | x-offset-keyword | z-offset */
transform-origin: bottom right 2cm;

/* Global values */
transform-origin: inherit;
transform-origin: initial;
transform-origin: unset;

The transform-origin p 屬性可以使用多次，每一次都代表著一個偏移量。若未設定偏移量，則重置為其對應的初始值。

If two or more values are defined and either no value is a keyword, or the only used keyword is center, then the first value represents the horizontal offset and the second represents the vertical offset.

One-value syntax:
- The value must be a <length>, a <percentage>, or one of the keywords left, center, right, top or bottom.
Two-value syntax:
- One value must be a <length>, a <percentage>, or one of the keywords left, center, and right.
- The other value must be a <length>, a <percentage>, or one of the keywords top, center, and bottom.
Three-value syntax:
- The first two values are the same as for the two-value syntax.
- The third value must be a <length>. It always represents the Z offset.

Values

x-offset: Is a <length> or a <percentage> describing how far from the left edge of the box the origin of the transform is set.
offset-keyword: Is one of the left, right, top, bottom, or center keyword describing the corresponding offset.
y-offset: Is a <length> or a <percentage> describing how far from the top edge of the box the origin of the transform is set.
x-offset-keyword: Is one of the left, right, or center keyword describing how far from the left edge of the box the origin of the transform is set.
y-offset-keyword: Is one of the top, bottom, or center keyword describing how far from the top edge of the box the origin of the transform is set.
z-offset: Is a <length> (and never a <percentage> which would make the statement invalid) describing how far from the user eye the z=0 origin is set.

The keywords are convenience shorthands and match the following <percentage> values:

Keyword	Value
`left`	`0%`
`center`	`50%`
`right`	`100%`
`top`	`0%`
`bottom`	`100%`

Formal syntax

transform-origin = 
  [ left | center | right | top | bottom | <length-percentage> ]  |
  [ left | center | right | <length-percentage> ] [ top | center | bottom | <length-percentage> ] <length>?  |
  [ [ center | left | right ] && [ center | top | bottom ] ] <length>?  

<length-percentage> = 
  <length>      |
  <percentage>

Examples

<div class="container">
  <div class="example">
    <div class="box box1">&nbsp;</div>
    <div class="box original">&nbsp;</div>
  </div>

  <pre>
transform: none;
</pre
  >

  <div class="example">
    <div class="box box2">&nbsp;</div>
    <div class="box original">&nbsp;</div>
  </div>

  <pre>
transform: rotate(30deg);
</pre
  >

  <div class="example">
    <div class="box box3">&nbsp;</div>
    <div class="box original">&nbsp;</div>
  </div>

  <pre>
transform: rotate(30deg);
transform-origin: 0 0;
</pre
  >

  <div class="example">
    <div class="box box4">&nbsp;</div>
    <div class="box original">&nbsp;</div>
  </div>

  <pre>
transform: rotate(30deg);
transform-origin: 100% 100%;
</pre
  >

  <div class="example">
    <div class="box box5">&nbsp;</div>
    <div class="box original">&nbsp;</div>
  </div>

  <pre>
transform: rotate(30deg);
transform-origin: -1em -3em;
</pre
  >

  <div class="example">
    <div class="box box6">&nbsp;</div>
    <div class="box original">&nbsp;</div>
  </div>

  <pre>
transform: scale(1.7);
</pre
  >

  <div class="example">
    <div class="box box7">&nbsp;</div>
    <div class="box original">&nbsp;</div>
  </div>

  <pre>
transform: scale(1.7);
transform-origin: 0 0;
</pre
  >

  <div class="example">
    <div class="box box8">&nbsp;</div>
    <div class="box original">&nbsp;</div>
  </div>

  <pre>
transform: scale(1.7);
transform-origin: 100% -30%;
</pre
  >

  <div class="example">
    <div class="box box9">&nbsp;</div>
    <div class="box original">&nbsp;</div>
  </div>

  <pre>
transform: skewX(50deg);
transform-origin: 100% -30%;
</pre
  >

  <div class="example">
    <div class="box box10">&nbsp;</div>
    <div class="box original">&nbsp;</div>
  </div>

  <pre>
transform: skewY(50deg);
transform-origin: 100% -30%;
</pre
  >
</div>

.container {
  display: grid;
  grid-template-columns: 200px 100px;
  gap: 20px;
}

.example {
  position: relative;
  margin: 0 2em 4em 5em;
}

.box {
  display: inline-block;
  width: 3em;
  height: 3em;
  border: solid 1px;
  background-color: palegreen;
}

.original {
  position: absolute;
  left: 0;
  opacity: 20%;
}

.box1 {
  transform: none;
}

.box2 {
  transform: rotate(30deg);
}

.box3 {
  transform: rotate(30deg);
  transform-origin: 0 0;
}

.box4 {
  transform: rotate(30deg);
  transform-origin: 100% 100%;
}

.box5 {
  transform: rotate(30deg);
  transform-origin: -1em -3em;
}

.box6 {
  transform: scale(1.7);
}

.box7 {
  transform: scale(1.7);
  transform-origin: 0 0;
}

.box8 {
  transform: scale(1.7);
  transform-origin: 100% -30%;
}

.box9 {
  transform: skewX(50deg);
  transform-origin: 100% -30%;
}

.box10 {
  transform: skewY(50deg);
  transform-origin: 100% -30%;
}

Specifications

Specification
CSS Transforms Module Level 1 # transform-origin-property

預設值	`50% 50% 0`
Applies to	transformable elements
繼承與否	no
Percentages	refer to the size of bounding box
Computed value	for `<length>` the absolute value, otherwise a percentage
Animation type	simple list of length, percentage, or calc

Browser compatibility

BCD tables only load in the browser