Are there any other CSS properties like currentColor?

Question

It would be cool if currentWidth existed. Are there any other things like currentColor in the spec?

Answer 1

You're asking for a list of values whose computed values are relative to other values.

And that list is short. If we comb through the CSS 3 Values and Units Specification, we find that:

• inherit takes the parent value.

• unset can operate like inherit.

• currentColor uses the current font color.

These are units that specify relative values:

• % is a percentage of the parent value.

• em is relative to the current font size. rem is similar, but to the root element's font size.

• vw, vh, vmin and vmax are all relative to the viewport.

• ex, to the height of the current font -- sort of counts.

• ch, to the width of the "0" character in the current font -- also sort of counts.

These functional values don't exactly count but are worth mentioning:

• calc() allows mathematically-calculated values.

• toggle() lets child elements cycle through values.

• attr() returns the value of an element's attribute.

And historically:

• CSS 2 offers now-deprecated System Colors.