Eco Mode is a repo of code snippets and assets to support light/dark/eco mode support. With sustainable and efficient SVGs, JS, HTML, CSS snippets, and implementation advice (as comments in the suggested CSS, mainly).
What works for your site will vary. But I figured it would help to share some simplified versions right here.
More to follow soon, I hope!
- Susty Icons Github, should you want more icon options
- Web AIM Contrast Checker, to be sure your colour schemes are accessible
Thanks also to Nick Lewis for inspiring me with mad use of variables, and to various members of the W3C Sustainable Web Interest Group for bouncing ideas around about Eco mode, especially Tantek, Hidde, and Alex. Update: Thanks to Alex Dawson for the accessibility review/amendments!