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Add more info on Windows High Contrast mode

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Rohan Kumar 2022-04-19 20:19:58 -07:00
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8
content/posts/website-best-practices.gmi
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@ -558,7 +558,13 @@ The Web version of this page is an example application of Technique C25 and the
The Web version of this page only uses non-default colors when a user agent requests a dark color scheme (using the "prefers-color-scheme" CSS media query; see the next subsection) and for lightening borders. Any image with a solid background may match the page background; to ensure that their dimensions are clear, I surrounded them with borders. I also set a custom color for the borders and ensure that the image backgrounds don't match the border colors. I included borders further down to break up next/prev post navigation as well as separate footers, since these elements lack heading-based delineation. When overriding color schemes or disabling CSS altogether, the page layout remains clear.
Color overrides go well beyond simple foreground and background color changes. Windows' High Contrast Mode (HCM), for instance, makes more advanced modifications:
Color overrides go well beyond simple foreground and background color changes. Windows’ High Contrast Mode, for instance, makes more advanced modifications:
> Win HCM is a collection of user defined color themes that overwrite your definitions in CSS.
> It’s not about design but readability.
> Some stuff will disappear in Win HCM, some won’t. Best advice is to use semantic HTML to keep things visible.
> You can use transparent outline to keep things visble like focus indicators and surface boundaries or use currentColor to maintain SVG fill colors in Win HCM.
> You can use a special media query combined with special CSS color keywords to give elements the user defined colors.
=> https://accessabilly.com/accessibility-issues-concerning-windows-high-contrast-mode/ Accessibility issues concerning Windows HCM

24
content/posts/website-best-practices.md
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@ -211,7 +211,7 @@ Understanding round-trips requires understanding your server's approach to conge
Historically, TCP congestion control approaches typically set an initial window size to ten TCP packets and grew this value with each round-trip. Under most setups, this meant that the first round-trip could include 1460 bytes. The following round-trip could deliver under three kilobytes.[^4]
Nowadays, servers typically employ BBR-based congestion control. It allows for regular "spikes" in window size, but the initial window size is still small. Find more details in the slides from <span class="h-cite" itemscope itemtype="https://schema.org/PresentationDigitalDocument"> <cite class="p-name" itemprop="name headline" ><a class="u-url" itemprop="url" href="https://labs.apnic.net/presentations/store/2019-09-05-bbr.pdf">TCP and BBR</a></cite> (PDF) by {{<indieweb-person first-name="Geoff" last-name="Huston" itemprop="author" url="https://www.potaroo.net/" org="APNIC" org-url="https://www.apnic.net/">}} </span>
Nowadays, servers typically employ BBR-based congestion control. It allows for regular "spikes" in window size, but the initial window size is still small. Find more details in the slides from <span class="h-cite" itemscope itemtype="https://schema.org/PresentationDigitalDocument"> <cite class="p-name" itemprop="name headline" ><a class="u-url" itemprop="url" href="https://labs.apnic.net/presentations/store/2019-09-05-bbr.pdf">TCP and BBR</a></cite> (<span itemprop="encodingFormat">application/<wbr>pdf</span>) by {{<indieweb-person first-name="Geoff" last-name="Huston" itemprop="author" url="https://www.potaroo.net/" org="APNIC" org-url="https://www.apnic.net/">}} </span>
HTTP/3 uses QUIC instead of TCP, which makes things a bit different; the important thing to remember is that _user agents should be aware of all blocking resources **before** finishing the earliest possible round-trip._
@ -541,7 +541,7 @@ The xkcd comic <a href="#related-issues">included earlier in the page</a> had th
Image transcripts also help users relying on [machine-translation](#machine-translation), since translation tools rely on textual content (OCR is error-prone). These users won't read alt-text; have an alternative way to discover a transcript. Wherever you put the transcript, ensure it's semantically connected to the image. I linked a transcript in the figure caption.
I describe best practices for preparing pictures of text in [a dedicated section](#pictures-of-text).
I describe best practices for preparing pictures of text in [the "Pictures of text" section](#pictures-of-text).
About custom colors
-------------------
@ -567,7 +567,23 @@ Even if you set custom colors, ensure that the page is compatible with color ove
This page's [canonical location](https://seirdy.one/2020/11/23/website-best-practices.html) is an example application of Technique C25 (and the related [Technique G148](https://www.w3.org/WAI/WCAG22/Techniques/general/G148)). It only uses non-default colors when a user agent requests a dark color scheme (using the `prefers-color-scheme` CSS media query; see the next subsection) and for lightening borders. Any image with a solid background may match the page background; to ensure that their dimensions are clear, I surrounded them with borders. I also set a custom color for the borders and ensure that the image backgrounds don't match the border colors. I included borders to break up bottom sections, since these elements lack heading-based delineation. When overriding color schemes, the page layout remains clear.
Color overrides go well beyond simple foreground and background color changes. Windows' High Contrast Mode, for instance, makes [more advanced modifications](https://accessabilly.com/accessibility-issues-concerning-windows-high-contrast-mode/).
Color overrides go well beyond simple foreground and background color changes. Windows' High Contrast Mode, for instance, makes more advanced modifications to color palettes.
<figure itemscope itemtype="https://schema.org/Quotation">
<blockquote itemprop="text">
<ul>
<li>Win HCM is a collection of <strong>user defined color themes</strong> that overwrite your definitions in <abbr title="Cascading Style Sheets">CSS</abbr>.</li>
<li>It’s not about design but <strong>readability</strong>.</li>
<li>Some stuff will disappear in Win HCM, some won’t. Best advice is to use <strong>semantic <abbr title="Hypertext Markup Language">HTML</abbr></strong> to keep things visible.</li>
<li>You can use transparent <code>outline</code> to keep things visble like focus indicators and surface boundaries or use <code>currentColor</code> to maintain SVG <code>fill</code> colors in Win HCM.</li>
<li>You can use a special <strong>media query</strong> combined with special <strong><abbr title="Cascading Style Sheets">CSS</abbr> color keywords</strong> to give elements the user defined colors.</li>
</ul>
</blockquote>
{{< quotecaption partOfType="WebSite" >}}
{{<indieweb-person first-name="Martin" last-name="Mengele" url="https://accessabilly.com/about/" itemprop="author">}},
{{<cited-work name="Accessibility Issues concerning Windows High Contrast Mode" url="https://accessabilly.com/accessibility-issues-concerning-windows-high-contrast-mode/">}}
{{< /quotecaption >}}
</figure>
In fact, the CSS Working Group is working on a specification for re-coloring websites in <span itemscope itemtype="https://schema.org/TechArticle">{{<cited-work name="CSS Color Adjustment Module Level 1" extraName="headline" url="https://drafts.csswg.org/css-color-adjust-1/">}}</span>. The Chromium team's in-progress [auto dark mode](https://chromestatus.com/feature/5672533924773888) will use this specification to darken websites globally. Websites can opt out with the `color-scheme` property, but they really shouldn't have to: stylesheets should be robust enough to handle re-coloring.
@ -1327,7 +1343,7 @@ A special thanks goes out to GothAlice for the questions she answered in `#webde
[^13]: Consider disabling the JIT for your normal browsing too; doing so removes whole classes of vulnera&shy;bilities. In Firefox, navigate to `about:config` and toggle some flags under <code>javascript<wbr>.options</code>.
<figure itemscope="" itemtype="https://schema.org/SoftwareSourceCode">
<figure itemscope itemtype="https://schema.org/SoftwareSourceCode">
<figcaption>
<strong itemprop="name"> <span itemprop="codeSampleType">Code snippet</span> 11</strong>:
Firefox prefs to turn off JIT compilation