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The CSS preprocessors Sass and Less can take any color and darken() or lighten() it by a specific value. But no such ability is built into JavaScript. This function takes colors in hex format (i.e. #F06D06, with or without hash) …

This article was originally published on February 2, 2009 and is now being updated to clarify the concept and update the information for modern browsers.

RGBa is a way to declare a color in CSS that includes alpha transparency support. …

Here’s a quicky (there is a PHP version too):

var randomColor = Math.floor(Math.random()*16777215).toString(16);

See the Pen
Generate New Random Hex Color with JavaScript by Chris Coyier (@chriscoyier)
on CodePen.

If you’d prefer they are a bit more …