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CSS

i forgot what this was

The color stop value allows other background layers to show through a gradient.

3 Answers

I think you're referring to 'transparent':

div {
    background-color:transparent;
}

Use RGBA colours on your stop and give them an alpha less then 1.

For example a Red > Green > Blue gradient with 50% opacity would be done like this:

#grad {  
  background: linear-gradient(rgba(255, 0, 0, 0.5), rgba(0, 255, 0, 0.5), rgba(0, 0, 255, 0.5)); 
}

Codepen example: http://codepen.io/anon/pen/xbMbYB

By doing this it lets you set the individual transparency per colour on your gradient so for example you could instead do:

#grad {  
  background: linear-gradient(rgba(255, 0, 0, 1), rgba(0, 255, 0, 0.5), rgba(0, 0, 255, 0.25)); 
}

Which would give you a gradient with 100% opacity red, 50% opacity Green and 25% Opacity Blue.

hx XD