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Add recommendations for dark themes

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Rohan Kumar 2021-06-13 18:21:19 -07:00
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10
content/posts/website-best-practices.gmi
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@ -89,6 +89,8 @@ Some users' browsers set default page colors that aren't black-on-white. For ins
It's got a grey background, a header with unreadable black/grey text, and unreadable white-on-white code snippets It's got a grey background, a header with unreadable black/grey text, and unreadable white-on-white code snippets
## Dark themes
If you do explicitly set colors, please also include a dark theme using a media query: If you do explicitly set colors, please also include a dark theme using a media query:
``` ```
@ -99,6 +101,14 @@ For more info, read the relevant docs:
=> https://developer.mozilla.org/en-US/docs/Web/CSS/@media/prefers-color-scheme prefers-color-scheme docs on MDN => https://developer.mozilla.org/en-US/docs/Web/CSS/@media/prefers-color-scheme prefers-color-scheme docs on MDN
When setting colors, especially with a dark background, I recommend checking your page's contrast using Advanced Perceptual Contrast Algorithm (APCA) values. You can do so in an online checker or Chromium's developer tools (you might have to enable them in a menu for experimental preferences.
=> https://www.myndex.com/APCA/simple Online ACPA Contrast Calculator
Blue and purple links on a black background have much worse perceptual contrast than yellow or green links.
CSS filters such as "invert" are quite expensive to run, so they should be used sparingly. Simply inverting your page's colors to provide a dark theme could slow it down or cause a user's fans to spin.
## Image optimization ## Image optimization
Some image optimization tools I use: Some image optimization tools I use:

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content/posts/website-best-practices.md
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@ -98,8 +98,14 @@ Some users' browsers set default page colors that aren't black-on-white. For ins
{{< picture name="website_colors" alt="This page with a grey background behind black/grey headers and white-on-white code snippets" >}} {{< picture name="website_colors" alt="This page with a grey background behind black/grey headers and white-on-white code snippets" >}}
</a> </a>
### Dark themes
If you do explicitly set colors, please also include a dark theme using a media query: `@media (prefers-color-scheme: dark)`. For more info, read the relevant docs [on MDN](https://developer.mozilla.org/en-US/docs/Web/CSS/@media/prefers-color-scheme) If you do explicitly set colors, please also include a dark theme using a media query: `@media (prefers-color-scheme: dark)`. For more info, read the relevant docs [on MDN](https://developer.mozilla.org/en-US/docs/Web/CSS/@media/prefers-color-scheme)
When setting colors, especially with a dark background, I recommend checking your page's contrast using <abbr title="Advanced Perceptual Contrast Algorithm">APCA</abbr> values. You can do so in an [online checker](https://uglyduck.ca/lazy-dev-dark-mode/) or Chromium's developer tools (you might have to enable them in a menu for experimental preferences). Blue and purple links on a black background have much worse perceptual contrast than yellow or green links.
CSS filters such as `invert` are quite expensive to run, so they should be used sparingly. Simply inverting your page's colors to provide a dark theme could slow it down or cause a user's fans to spin.
Image optimization Image optimization
------------------ ------------------