perspective
Quick Summary for perspective
perspective CSS property determines the distance between the z=0 plane and the user in order to give a 3D-positioned element some perspective.
Code Usage for perspective
/* Keyword value */ perspective: none; /* <length> values */ perspective: 20px; perspective: 3.5em; /* Global values */ perspective: inherit; perspective: initial; perspective: revert; perspective: unset; More Details for perspective
perspective
The perspective CSS property determines the distance between the z=0 plane and the user in order to give a 3D-positioned element some perspective.
Syntax
/* Keyword value */ perspective: none; /* <length> values */ perspective: 20px; perspective: 3.5em; /* Global values */ perspective: inherit; perspective: initial; perspective: revert; perspective: unset; Values
none Indicates that no perspective transform is to be applied.
<length> A <length> giving the distance from the user to the z=0 plane. It is used to apply a perspective transform to the children of the element. Negative values are syntax errors. If the value is smaller than 1px, it is clamped to 1px.
Description
Each 3D element with z>0 becomes larger; each 3D-element with z<0 becomes smaller. The strength of the effect is determined by the value of this property. Large values of perspective cause a small transformation; small values of perspective cause a large transformation.
The parts of the 3D elements that are behind the user — i.e. their z-axis coordinates are greater than the value of the perspective CSS property — are not drawn.
The vanishing point is by default placed at the center of the element, but its position can be changed using the perspective-origin property.
Using this property with a value other than none creates a new stacking context. Also, in that case, the object will act as a containing block for position: fixed elements that it contains.
Formal definition
| Initial value | none |
|---|---|
| Applies to | transformable elements |
| Inherited | no |
| Computed value | the absolute length or none |
| Animation type | a length |
| Creates stacking context | yes |
Formal syntax
none | <length>
Examples
Setting perspective
An example showing how a cube varies if the perspective is set at different positions is given in Using CSS transforms > Setting perspective.
Specifications
| Specification |
|---|
| CSS Transforms Module Level 2 # perspective-property |
See also
Using CSS TransformsLast modified: Nov 10, 2021, by MDN contributors
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"Olivia, my eldest daughter, caught measles when she was seven years old. As the illness took its usual course I can remember reading to her often in bed and not feeling particularly alarmed about it. Then one morning, when she was well on the road to recovery, I was sitting on her bed showing her how to fashion little animals out of coloured pipe-cleaners, and when it came to her turn to make one herself, I noticed that her fingers and her mind were not working together and she couldn’t do anything. 'Are you feeling all right?' I asked her. 'I feel all sleepy,' she said. In an hour, she was unconscious. In twelve hours she was dead. The measles had turned into a terrible thing called measles encephalitis and there was nothing the doctors could do to save her. That was...in 1962, but even now, if a child with measles happens to develop the same deadly reaction from measles as Olivia did, there would still be nothing the doctors could do to help her. On the other hand, there is today something that parents can do to make sure that this sort of tragedy does not happen to a child of theirs. They can insist that their child is immunised against measles. ...I dedicated two of my books to Olivia, the first was ‘James and the Giant Peach’. That was when she was still alive. The second was ‘The BFG’, dedicated to her memory after she had died from measles. You will see her name at the beginning of each of these books. And I know how happy she would be if only she could know that her death had helped to save a good deal of illness and death among other children."
I just checked google books for BFG, and the dedication is there.
https://www.google.com.au/books/edition/_/quybcXrFhCIC?hl=en&gbpv=1
Roald Dahl, 1986
