Baseline

Get a baseline grid overlay on your site in one painless, javascript-free step.

Here's an example demonstrating how to get a 24px baseline overlay on your site:

Easy, huh?

Further Examples:

Specify a 6 digit hex code:

Specify separate RGB values:

Specify 50% alpha using RGBA:

Image Only Mode

You can use Baseline to grab the image on it's own, if you'd rather apply it as a background in your own stylesheet.

Simple example:

html {
  background-image: url(http://basehold.it/i/24); /* 24px baseline */
  background-image: url(http://basehold.it/i/24/ff0000); /* with Hex colour */
  background-image: url(http://basehold.it/i/24/255/0/0); /* with RGB colour */
  background-image: url(http://basehold.it/i/24/255/0/0/0.85); /* with RGBA colour */
}

Bookmarklet

Just add this as a bookmark:

javascript:(function(){var%20link=document.createElement("link");link.setAttribute("rel","stylesheet");link.setAttribute("href","http://basehold.it/"+parseInt(window.getComputedStyle(document.body).getPropertyValue("line-height"),10));document.head.appendChild(link);})()

This will add the default grid according to your body line-height (using

getComputedStyle