font-optical-sizing
Quick Summary for font-optical-sizing
font-optical-sizing CSS property sets whether text rendering is optimized for viewing at different sizes.
Code Usage for font-optical-sizing
/* keyword values */ font-optical-sizing: none; font-optical-sizing: auto; /* default */ /* Global values */ font-optical-sizing: inherit; font-optical-sizing: initial; font-optical-sizing: revert; font-optical-sizing: unset; More Details for font-optical-sizing
font-optical-sizing
The font-optical-sizing CSS property sets whether text rendering is optimized for viewing at different sizes.
Syntax
/* keyword values */ font-optical-sizing: none; font-optical-sizing: auto; /* default */ /* Global values */ font-optical-sizing: inherit; font-optical-sizing: initial; font-optical-sizing: revert; font-optical-sizing: unset; Values
noneThe browser will not modify the shape of glyphs for optimal viewing.
autoThe browser will modify the shape of glyphs for optimal viewing.
Description
Optical sizing is enabled by default for fonts that have an optical size variation axis. The optical size variation axis is represented by opsz in font-variation-settings.
When optical sizing is used, small text sizes are often rendered with thicker strokes and larger serifs, whereas larger text is often rendered more delicately with more contrast between thicker and thinner strokes.
Formal definition
| Initial value | auto |
|---|---|
| Applies to | all elements. It also applies to ::first-letter and ::first-line. |
| Inherited | yes |
| Computed value | as specified |
| Animation type | discrete |
Formal syntax
auto | none
Examples
Disabling optical sizing
<p class="optical-sizing">This paragraph is optically sized. This is the default across browsers.</p> <p class="no-optical-sizing">This paragraph is not optically sized. You should see a difference in supporting browsers.</p> @font-face { src: url('AmstelvarAlpha-VF.ttf'); font-family:'Amstelvar'; font-style: normal; } p { font-size: 36px; font-family: Amstelvar; } .no-optical-sizing { font-optical-sizing: none; } Note: The font referenced above — which includes optical sizing and is freely-licensed — is good for testing. You can download it on GitHub.
Specifications
| Specification |
|---|
| CSS Fonts Module Level 4 # font-optical-sizing-def |
See also
font-size font-size-adjust Fundamental text and font styling 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
