initial-value
Quick Summary for initial-value (@property)
Check the Browser compatibility table carefully before using this in production.
Code Usage for initial-value (@property)
@property --property-name { syntax: '<color>'; inherits: false; initial-value: #c0ffee; } @property --property-name { syntax: '<color>'; inherits: true; initial-value: #c0ffee; } More Details for initial-value (@property)
initial-value
Experimental: This is an experimental technologyCheck the Browser compatibility table carefully before using this in production.
The initial-value CSS descriptor is required when using the @property at-rule unless the syntax accepts any valid token stream. It sets the initial-value for the property.
The value chosen as the initial-value must parse correctly according to the syntax definition. Therefore, if syntax is <color> then the initial-value must be a valid color value.
Syntax
@property --property-name { syntax: '<color>'; inherits: false; initial-value: #c0ffee; } @property --property-name { syntax: '<color>'; inherits: true; initial-value: #c0ffee; } Values
A string with a value which is a correct value for the chosen syntax.
Formal definition
| Related at-rule | @property |
|---|---|
| Initial value | n/a (required) |
| Computed value | as specified |
Formal syntax
<string>
Examples
Add type checking to --my-color custom property, as a color, the initial-value being a valid color:
Using CSS @property at-rule:
@property --my-color { syntax: '<color>'; inherits: false; initial-value: #c0ffee; } Using JavaScript CSS.registerProperty:
window.CSS.registerProperty({ name: '--my-color', syntax: '<color>', inherits: false, initialValue: '#c0ffee', }); Specifications
| Specification |
|---|
| CSS Properties and Values API Level 1 # initial-value-descriptor |
See also
CSS Properties and Values API CSS Painting API CSS Typed Object Model CSS HoudiniLast 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
