When focused or clicked, the slider track and thumb are supposed to become darker as per the spec

[kitgrose]

In the spec, the slider's colour changes from rgb(176, 176, 176) to rgb(238, 238, 238) when it has focus or is being clicked:

In practice, this doesn't seem to be implemented in MDL (the track stays the same colour), in both Safari and Chrome on OS X Version 10.10.4.

[sgomes]

Wow, good eyes, @kitgrose! Can't believe how many times I looked at that image and never noticed o_O

I'll see if I can cook up a fix soon.

[Garbee]

It's the subtle things in the spec that drive us mad.

[sgomes]

Not feasible to fix in v1. For v2, the slider is being rewritten as part of #4494.