Support theming with CSS Custom Properties

feature request

Use CSS custom properties for at least color selection.

What is the expected behaviour?

To be able to alter the color-scheme during runtime on supported browsers, and fall-back to predefined SASS defined colors on others

Here is a sample (by Cris Coyier) of how CSS custom properties might work

Is there anything else we should know?

Here is a simple sass mixin that might help:

@mixin variable($property, $variable, $fallback) {
  #{$property}: $fallback;
  #{$property}: var($variable);
}

By using something like that mixin, support for browsers that have no CSS variables support, stay’s the same way as its now, while supported browsers gain a way more flexible way to use colors.

[jelbourn]

It will likely be early 2020 (when Microsoft plans to end support for IE11)

[jpike88]

IE11 support should ALWAYS be taken into account, regardless of when Microsoft says they’re phasing out anything. There are many, many companies out there with older versions of Windows that couldn’t care less about keeping up to date, and enterprise products would need to have IE11 far into the future to remain competitive.