Firefox Marketplace Animated Buttons

By  on  

The Firefox Marketplace is an incredibly attractive, easy to use hub that promises to make finding and promoting awesome HTML5-powered web applications easy and convenient. While I don't work directly on the Marketplace, I am privy to the codebase (and so are you). One of the well written and elegant touches to the site is its animated button. They are comprised completely of CSS and achieve a great effect by animating box-shadow and line-height.

The HTML

These styles can be applied to A elements with the button class or actual BUTTON elements:

<a href="#" class="button" role="button">Arsenal Arsenal Arsenal</a>

Since BUTTON elements have had styling quirks in the past, you'll want to use A elements everywhere outside of forms.

The CSS

There's a lot of CSS in the basic element state, but I kept all of it to keep my demo true to the Marketplace button. Here's the magic:

a.button:link,
a.button:visited,
button,
input[type=submit],
input[type=button] {
	border: 0;
	color: white;
	display: inline-block;
	font: 600 16px/31px "Open Sans","Helvetica Neue",Arial,sans-serif;
	height: 32px;
	background-color: 
	#267CC2;
	padding: 0 24px;
	position: relative;
	text-align: center;
	text-decoration: none;
	text-shadow: 0 1px 0 rgba(0, 0, 0, .25);
	white-space: nowrap;
	border-radius: .5em;
	box-shadow: 0 2px 1px rgba(0, 0, 0, .2), inset 0 -1px 0 rgba(0, 0, 0, .2), inset 0 1px 0 0 rgba(255, 255, 255, .2);
	background-color: #267CC2;
	background-image: linear-gradient(#42A5E1, #267CC2);
	transition-property: -moz-box-shadow,-webkit-box-shadow,box-shadow,line-height;
	transition-duration: .2s,.2s,.2s,.2s;
}

a.button:hover,
a.button:focus,
button:hover,
button:focus,
input[type=submit]:hover,
input[type=button]:hover,
input[type=submit]:focus,
input[type=button]:focus {
    box-shadow: 0 4px 1px rgba(0, 0, 0, 0.2), 0 -3px 0 rgba(0, 0, 0, 0.2) inset;
	line-height: 28px;
	text-decoration: none;
}

a.button:active, button.button:active {
    box-shadow: inset 0 2px 0 0 rgba(0, 0, 0, .2), inset 0 12px 24px 6px rgba(0, 0, 0, .2), inset 0 0 2px 2px rgba(0, 0, 0, .2);
	transition-duration: .1s,.1s,.1s,.1s;
	line-height: 34px;
}

As you can probably guess, the original CSS was generated using a preprocessor (LESS, in this case). As with any piece of expertly written code, there isn't too much to explain. The animated transition is applied to box-shadow and line-height properties and the :active and :hover states trigger the animations.

I love what the AMO and Marketplace team has done with this subtle effect. Not only is the effect smooth and unique, it requires no JavaScript and uses what have now become standard effect techniques. Love it!

Recent Features

  • By
    Write Better JavaScript with Promises

    You've probably heard the talk around the water cooler about how promises are the future. All of the cool kids are using them, but you don't see what makes them so special. Can't you just use a callback? What's the big deal? In this article, we'll...

  • By
    5 HTML5 APIs You Didn&#8217;t Know Existed

    When you say or read "HTML5", you half expect exotic dancers and unicorns to walk into the room to the tune of "I'm Sexy and I Know It."  Can you blame us though?  We watched the fundamental APIs stagnate for so long that a basic feature...

Incredible Demos

Discussion

    Wrap your code in <pre class="{language}"></pre> tags, link to a GitHub gist, JSFiddle fiddle, or CodePen pen to embed!