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CSS 內的transform-origin屬性可以設定元素變化的原點。

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

/* 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, centerrighttop or bottom.
  • Two-value syntax:
  • 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

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

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

Examples

Code Sample

transform: none;

transform: rotate(30deg);

transform: rotate(30deg);
transform-origin: 0 0;

transform: rotate(30deg);
transform-origin: 100% 100%;

transform: rotate(30deg);
transform-origin: -1em -3em;

transform: scale(1.7);

transform: scale(1.7);
transform-origin: 0 0;

transform: scale(1.7);
transform-origin: 100% -30%;

transform: skewX(50deg);
transform-origin: 100% -30%;

transform: skewY(50deg);
transform-origin: 100% -30%;

Specifications

Specification Status Comment
CSS Transforms Level 1
The definition of 'transform-origin' in that specification.
Working Draft  

預設值50% 50% 0
Applies totransformable elements
繼承與否no
Percentagesrefer to the size of bounding box
Mediavisual
Computed valuefor length the absolute value, otherwise a percentage
Animation typesimple list of length, percentage, or calc
Canonical orderOne or two values, with length made absolute and keywords translated to percentages

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support Yes -webkit-

12

12 -webkit-

16

3.5 -moz-

49 -webkit-

44 -webkit- 1

10

9 -ms-

12.1

10.5 -o-

3.1 -webkit-
Three-value syntax Yes ?109 No Yes
Support in SVG Yes ?

432

41 —?2 3

No Yes ?
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support ? ?

Yes

Yes -webkit-

16

4 -moz-

49 -webkit-

44 -webkit- 1

? ? ?
Three-value syntax ? ? ? ? No ? ?
Support in SVG ? ? ? ? ? ? ?

1. From version 44: this feature is behind the layout.css.prefixes.webkit preference (needs to be set to true). To change preferences in Firefox, visit about:config.

2. Keywords and percentages refer to the canvas instead of the object itself. See bug 1209061.

3. From version 41: this feature is behind the svg.transform-origin.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.

See also

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