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docs: dark mode #2054

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@bennypowers bennypowers commented Nov 18, 2024

What I did

  1. add dark mode toggle to masthead (iconography, ux TBD)
  2. various hacks and workarounds in context, surface, switch, to make darkmode + hydration work
  3. prevent fouc (flash of white background)
Screencast.From.2024-11-18.08-02-16.mp4

Testing Instructions

  1. set throttling in network panel
  2. set dark mode prefs in browser
  3. load up the dp
  4. toggle the switch in the masthead
  5. toggle dark mode in OS / browser prefs

Notes to Reviewers

icons and ux of the switch are TBD

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@bennypowers bennypowers changed the title Docs/dark mode docs: dark mode Nov 18, 2024
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Size Change: +569 B (+0.27%)

Total Size: 208 kB

Filename Size Change
./lib/context/color/consumer.js 1.37 kB +26 B (+1.93%)
./uxdot/uxdot-masthead.js 1.35 kB +543 B (+67.12%) 🆘
ℹ️ View Unchanged
Filename Size
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@zeroedin
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Opinion here:

I feel like in order to make this really viable we need full theming css layer. Instead of the switch swapping between darkest and lightest context on a master surface, what we really need is a light and dark theme that get swapped and then components based on that parent theme then change to suit on that theme. Context shouldn't in that way change, only the theme layer.

@bennypowers
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bennypowers commented Nov 24, 2024

I'm not entirely sure what you mean by full theming css layer, so let me describe what I think you mean, and respond to that. If I got it wrong, let me know.

The way most sites do this is by toggling a class name or attribute on the body, for example shoelace uses sl-light or sl-dark class names, and those class names are styled by rules in theme-specific stylesheets, those rules containing large lists of custom properties which define the theme.

So if we were to do such a thing, we'd add some hypothetical rh-dark or rh-light class to the body, then change the values of our theming properties.

While that's a good approach for most sites, it runs contrary to the principles of theming in RHDS. In our design system, theme and color palette are two different things. When discussing RHDS, "theme" means customizing one or more color palettes. When we think about it that way, what need does the design system docs site have to customize the theme, outside of pages which provide examples of how to do so? Wouldn't that be confusing, a bait-and-switch?

Rather, we should strive to make ux-dot an exemplar of our HTML-first approach to design systems engineering. In most cases the user of our design system (i.e. the page author) should get most of the utility of the DS from HTML tags and attributes. Occasionally, they may use CSS to customize designs (e.g. for a particular pattern or to implement a custom theme) and rarely they should use JavaScript APIs to provide interactivity (e.g. to toast an alert). The "big idea" of dark mode / theming / color palettes in RHDS is that authors who just want to use the sane defaults shouldn't have to write CSS or JS to get them.

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