perspective-origin
Quick Summary for perspective-origin
perspective-origin CSS property determines the position at which the viewer is looking. It is used as the vanishing point by the perspective property.
Code Usage for perspective-origin
/* One-value syntax */ perspective-origin: x-position; /* Two-value syntax */ perspective-origin: x-position y-position; /* When both x-position and y-position are keywords, the following is also valid */ perspective-origin: y-position x-position; /* Global values */ perspective-origin: inherit; perspective-origin: initial; perspective-origin: revert; perspective-origin: unset; More Details for perspective-origin
perspective-origin
The perspective-origin CSS property determines the position at which the viewer is looking. It is used as the vanishing point by the perspective property.
The perspective-origin and perspective properties are attached to the parent of a child transformed in 3-dimensional space, unlike the perspective() transform function which is placed on the element being transformed.
Syntax
/* One-value syntax */ perspective-origin: x-position; /* Two-value syntax */ perspective-origin: x-position y-position; /* When both x-position and y-position are keywords, the following is also valid */ perspective-origin: y-position x-position; /* Global values */ perspective-origin: inherit; perspective-origin: initial; perspective-origin: revert; perspective-origin: unset; Values
x-positionIndicates the position of the abscissa of the vanishing point. It can have one of the following values:
<length-percentage> indicating the position as an absolute length value or relative to the width of the element. The value may be negative. left, a keyword being a shortcut for the 0 length value. center, a keyword being a shortcut for the 50% percentage value. right, a keyword being a shortcut for the 100% percentage value. y-position Indicates the position of the ordinate of the vanishing point. It can have one of the following values:
<length-percentage> indicating the position as an absolute length value or relative to the height of the element. The value may be negative. top, a keyword being a shortcut for the 0 length value. center, a keyword being a shortcut for the 50% percentage value. bottom, a keyword being a shortcut for the 100% percentage value. Formal definition
| Initial value | 50% 50% |
|---|---|
| Applies to | transformable elements |
| Inherited | 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 |
Formal syntax
<position>where
<position> = [ [ left | center | right ] || [ top | center | bottom ] | [ left | center | right | <length-percentage> ] [ top | center | bottom | <length-percentage> ]? | [ [ left | right ] <length-percentage> ] && [ [ top | bottom ] <length-percentage> ] ]where
<length-percentage> = <length> | <percentage>
Examples
Changing the perspective origin
An example showing how to change perspective-origin is given in Using CSS transforms > Changing the perspective origin.
Specifications
| Specification |
|---|
| CSS Transforms Module Level 2 # perspective-origin-property |
See also
Using CSS Transformstransform-style <transform-function> perspective transform: perspective() function Last modified: Oct 21, 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
