<angle>
Quick Summary for angle#rad
<angle> CSS data type represents an angle value expressed in degrees, gradians, radians, or turns. It is used, for example, in <gradient>s and in some transform functions.
Code Usage for angle#rad
More Details for angle#rad
<angle>
The <angle> CSS data type represents an angle value expressed in degrees, gradians, radians, or turns. It is used, for example, in <gradient>s and in some transform functions.
Syntax
The <angle> data type consists of a <number> followed by one of the units listed below. As with all dimensions, there is no space between the unit literal and the number. The angle unit is optional after the number 0.
Optionally, it may be preceded by a single + or - sign. Positive numbers represent clockwise angles, while negative numbers represent counterclockwise angles. For static properties of a given unit, any angle can be represented by various equivalent values. For example, 90deg equals -270deg, and 1turn equals 4turn. For dynamic properties, like when applying an animation or transition, the effect will nevertheless be different.
Units
deg Represents an angle in degrees. One full circle is 360deg. Examples: 0deg, 90deg, 14.23deg.
grad Represents an angle in gradians. One full circle is 400grad. Examples: 0grad, 100grad, 38.8grad.
rad Represents an angle in radians. One full circle is 2π radians which approximates to 6.2832rad. 1rad is 180/π degrees. Examples: 0rad, 1.0708rad, 6.2832rad.
turn Represents an angle in a number of turns. One full circle is 1turn. Examples: 0turn, 0.25turn, 1.2turn.
Examples
Setting a clockwise right angle
90deg = 100grad = 0.25turn ≈ 1.5708rad |
Setting a flat angle
180deg = 200grad = 0.5turn ≈ 3.1416rad |
Setting a counterclockwise right angle
-90deg = -100grad = -0.25turn ≈ -1.5708rad |
Setting a null angle
0 = 0deg = 0grad = 0turn = 0rad |
Specifications
| Specification |
|---|
| CSS Values and Units Module Level 5 # angles |
See also
CSS data types The<gradient> type CSS rotation transforms: rotate(), rotate3d(), rotateX(), rotateY(), and rotateZ() CSS transforms Using CSS transforms Using CSS gradients Last modified: Aug 12, 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
