WebKit color-stop procent in -webkit-gradient
As I’ve found out I can’t use more than 100% in WebKit implementtation of linear-gradient. So I need 150% in second color-stop -webkit-gradient(linear, left top, left bottom, color-stop(0, red), color-stop(1.5, blue));
WebKit implementation allow to use no more than 100%, but we can avoid this “feature” and use background-size: 1px 150%
In first case I have http://jsfiddle.net/okhomenko/GZP4x/:
#gradient {
background-image:
-webkit-gradient(linear, left top, left bottom,
color-stop(0, red), color-stop(1.5, blue);
}
And get:

And in case http://jsfiddle.net/okhomenko/GZP4x/1/
#gradient {
height: 50px;
background-image:
-webkit-gradient(linear, left top, left bottom,
color-stop(0, red), color-stop(1, blue));
background-size: 1px 150%;
}

So if you want to customize your gradient in WebKit you can use this method. In FF4 everything works fine just like this - background-image: -moz-linear-gradient(top, red, blue 150%), so in some time I think it will work in WebKit