This is another cross-post of an article I wrote for the blog. It shows off some of the fun stuff web developers can do with the -moz-box-shadow feature that will be released as part of Firefox 3.5.

Another fun CSS3 feature that's been implemented in Firefox 3.5 is box shadows. This feature allows the casting of a drop "shadow" from the frame of almost any arbitrary element.

As the CSS3 box shadow property is still a work in progress, however, it's been implemented as -moz-box-shadow in Firefox. This is how Mozilla tests experimental properties in CSS, with property names prefaced with "-moz-". When the specification is finalized, the property will be named "box-shadow."

How it works

Applying a box shadow to an element is straightforward. The CSS3 standard allows as its value:

none | <shadow> [ <shadow> ]*

where <shadow> is:

<shadow> = inset? && [ <length>{2,4} && <color>? ]

The first two lengths are the horizontal and vertical offset of the shadow, respectively. The third length is the blur radius (compare that to the blur radius in in the text-shadow property). Finally the fourth length is the spread radius, allowing the shadow to grow (positive values) or shrink (negative values) compared to the size of the parent element.

The inset keyword is pretty well explained by the standard itself:

if present, [it] changes the drop shadow from an outer shadow (one that shadows the box onto the canvas, as if it were lifted above the canvas) to an inner shadow (one that shadows the canvas onto the box, as if the box were cut out of the canvas and shifted behind it).

But talk is cheap, let's look at some examples.

To draw a simple shadow, just define an offset and a color, and off you go:

 -moz-box-shadow: 1px 1px 10px #00f;


simple box shadow

(Each of the examples in this article are live examples first, followed by a screen shot from Firefox 3.5 on OSX).

Similarly, you can draw an in-set shadow with the aforementioned keyword.

-moz-box-shadow: inset 1px 1px 10px #888;


inset box shadow

With the help of a spread radius, you can define smaller (or bigger) shadows than the element it is applied to:

-moz-box-shadow: 0px 20px 10px -10px #888;


box shadow with spread radius

If you want, you can also define multiple shadows by defining several shadows, separated by commas (courtesy of Markus Stange):

-moz-box-shadow: 0 0 20px black, 20px 15px 30px yellow, -20px 15px 30px lime, -20px -15px 30px blue, 20px -15px 30px red;


multiple box shadows

The different shadows blend into each other very smoothly, and as you may have noticed, the order in which they are defined does make a difference. As box-shadow is a CSS3 feature, Firefox 3.5 adheres to the CSS3 painting order. That means, the first specified shadow shows up on top, so keep that in mind when designing multiple shadows.

As a final example, I want to show you the combination of -moz-box-shadow with an RGBA color definition. RGBA is the same as RGB, but it adds an alpha-channel transparency to change the opacity of the color. Let's make a black, un-blurred box shadow with an opacity of 50 percent, on a yellow background:

-moz-box-shadow: inset 5px 5px 0 rgba(0, 0, 0, .5);


box shadow with RGBA

As you can see, the yellow background is visible though the half-transparent shadow without further ado. This feature becomes particularly interesting when background images are involved, as you'll be able to see them shining through the box shadow.

Cross-Browser Compatibility

As a newer, work-in-progress CSS3 property, box-shadow has not yet been widely adopted by browser makers.

  • Firefox 3.5 supports the feature as -moz-box-shadow, as well as multiple shadows, the inset keyword and a spread radius.
  • Safari/WebKit has gone down a similar route as Firefox by implementing the feature as -webkit-box-shadow. Multiple shadows are supported since version 4.0, while neither inset shadows nor the spread radius feature are supported yet in WebKit.
  • Finally, Opera and Microsoft Internet Explorer have not yet implemented the box shadow property, though in MSIE you may want to check out their proprietary DropShadow filter.

To achieve the biggest possible coverage, it is advisable to define all three, the -moz, -webkit, and standard CSS3 syntax in parallel. Applicable browsers will then pick and adhere to the ones they support. For example:

 -moz-box-shadow: 1px 1px 10px #00f;
 -webkit-box-shadow: 1px 1px 10px #00f;
 box-shadow: 1px 1px 10px #00f;

The good news is that the box-shadow property degrades gracefully on unsupported browsers. For example, all the examples above will look like plain and boring boxes with no shadow in MSIE.


The CSS3 box-shadow property is not yet as widely available in browsers (and therefore, to users) as, for example, the text-shadow property, but with the limited box shadow support of WebKit as well as the full support provided by Firefox 3.5 (as far as the current status of the feature draft is concerned), more and more users will be able to see some level of CSS box shadows.

As a web developer, you can therefore use the feature, confident that you are giving users with modern browsers an improved experience while not turning away users with older browsers.

Further resources Documentation


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This kid is awesome:

Fastest Firefox: World's Fastest Cup Stacker

He's 11 years old, and the world's fastest cup stacker. He made this "Fastest Firefox" video for the upcoming Firefox 3.5 launch. Of course Firefox can't stack cups, but its new TraceMonkey JavaScript engine is also one of the fastest in the world!

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This is a cross-post of an article I wrote for the blog. It shows off some of the fun stuff web developers can do with the text-shadow feature that will be released as part of Firefox 3.5.

The text-shadow CSS property does what the name implies: It lets you create a slightly blurred, slightly moved copy of text, which ends up looking somewhat like a real-world shadow.

The text-shadow property was first introduced in CSS2, but as it was improperly defined at the time, its support was dropped again in CSS2.1. The feature was re-introduced with CSS3 and has now made it into Firefox 3.5.

How it Works

According to the CSS3 specification, the text-shadow property can have the following values:

none | [<shadow>, ] * <shadow>,

<shadow> is defined as:

[ <color>? <length> <length> <length>? | <length> <length> <length>? <color>? ],

where the first two lengths represent the horizontal and vertical offset and the third an optional blur radius. The best way to describe it is with examples.

We can make a simple shadow like this, for example:

text-shadow: 2px 2px 3px #000;
A simple shadow

(All of the examples are a live example first, then a picture of the working feature — so you can compare your browser’s behavior with the one of Firefox 3.5 on OSX)

If you are a fan of hard edges, you can just refrain from using a blur radius altogether:

text-shadow: 2px 2px 0 #888;
I don’t like blurs

Glowing text, and multiple shadows

But due to the flexibility of the feature, the fun does not stop here. By varying the text offset, blur radius, and of course the color, you can achieve various effects, a mysterious glow for example:

text-shadow: 1px 1px 5px #fff;
Glowing text

or a simple, fuzzy blur:

text-shadow: 0px 0px 5px #000;
Blurry text

Finally, you can add ”more than one shadow”, allowing you to create pretty “hot” effects (courtesy of

text-shadow: 0 0 4px white, 0 -5px 4px #FFFF33, 2px -10px 6px #FFDD33, -2px -15px 11px #FF8800, 2px -25px 18px #FF2200
Multiple shadows are hot

The number of text-shadows you can apply at the same time in Firefox 3.5 is — in theory — unlimited, though you may want to stick with a reasonable amount.

Like all CSS properties, you can modify text-shadow on the fly using JavaScript:

Animated shadows with JavaScript

Start/stop animation

Performance, Accessibility and Cross-Browser Compatibility

The times of using pictures (or even worse, Flash) for text shadows on the web are numbered for two reasons:

First, there are significant advantages to using text instead of pictures. Not using pictures saves on bandwidth and HTTP connection overhead. Accessibility, both for people who use screen readers and search engines, is greatly improved. And page zoom will work better because the text can be scaled instead of using pixel interpolation to scale up an image.

Second this feature is largely cross-browser compatible:

  • Opera supports text-shadow since version 9.5. According to the Mozilla Developer Center, Opera 9.x supports up to 6 shadows on the same element.
  • Safari has had the feature since version 1.1 (and other WebKit-based browsers along with it).
  • Internet Explorer does not support the text-shadow property, but the feature degrades gracefully to regular text. In addition, if you want to emulate some of the text-shadow functionality in MSIE, you can use Microsoft’s proprietary ”Shadow” and ”DropShadow” filters.
  • Similarly to MSIE, when other, older browsers do not support the feature (including Firefox 3 and older), they will just show the regular text without any shadows.

A caveat worth mentioning is the ”drawing order”: While Opera 9.x adheres to the CSS2 painting order (i.e., the first specified shadow is drawn at the bottom), Firefox 3.5 adheres to the CSS3 painting order (the first specified shadow is on top). Keep this in mind when drawing multiple shadows.


text-shadow is a subtle but powerful CSS feature that is — now that it is supported by Firefox 3.5 — likely to be widely adopted across the web in the foreseeable future. Due to its graceful degradation in older browsers, it can safely be used by developers and will, over time, be seen by more and more users.

Finally, some words of wisdom: Like any eye candy, use it like salt in a soup — with moderation, not by the bucket. If the web developers of the world overdo it, text-shadow may die a short, yet painful death. It would be sad if we make users flinch at the sight of text shadows like typography geeks at the sight of “Papyrus”, and thus needed to bury the feature deeply in our treasure chest.

That being said: Go try it out!

Further resources



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Today, Mozilla Corporation moved into new headquarters, across town, in Mountain View, California. The new place, which I have only seen as a building site so far, is bound to be awesome, judging by the photos that are slowly showing up on the web.

These and more photos are available on Deb Richardson's flickr feed (thanks, Deb!):

Mozilla Headquarters, Pic 1

Mozilla Headquarters, Pic 2

Mozilla Headquarters, Pic 3

Mozilla Headquarters, Pic 4

I can't wait to go visit!

Update: There are more photos of the new Mozilla office on osunick's flickr page.

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Wahlkampf mit Gesichtern
Creative Commons License photo credit: daklebtwas
Tomorrow, June 7, 2009, the people of Europe elect the next European Parliament. Perhaps less well-known, this date also coincides with the local elections in the state of Baden-Württemberg, so besides the European ballot, I will also get to vote for

  • the local town council
  • the city council of the city my home town belongs to
  • and the district council.

While possibly not the most influential councils of all, the number of elections at once is quite impressive. What makes these elections the most fun of all though, are the concepts of "Kumulieren" and "Panaschieren" that I'll shortly explain to you here.

Let's assume there are three active parties in this election: A light blue one, a pink one, and an orange one. For each of these, you'll receive a ballot containing their designated votees, along with the instructions telling you that you have, for example, 10 votes at your disposal.

Imagine you like the pink party the most. The easiest way to handle this is to take the pink ballot, fold it, and drop it into the ballot box. You'll automatically have given each of the people on the ballot 1 vote. But we are in Germany, and we find "simple" boring, so let's spice that up a bit.

It just happens that you like one guy in the Pink party, Paul Olitician, more than the others. After all, whenever you meet him at the bars, he buys you a beer, and to return the favor, you listen to him explain his political visions in detail. The perfect symbiosis, if you will.

In that case, you can go ahead and "accumulate" up to three votes on Paul, and then spread the remaining seven votes across the other candidates on the ballot. You may end up not having enough votes for each of the party members on there, but that's fine, as one of them is your former high school teacher whom you didn't like very much anyway. The process of giving a person on the ballot more than one vote is called "Kumulieren" in German.

But then, just before and you are done giving away all your votes, you realize there are empty lines left on each of the ballots. Also, you notice your neighbor John is a candidate for the light blue party. You don't want to vote for them as a whole, because you still like the pink party better, but you would like to vote for John. After all, you are still grateful for that one time when he heroically kept you from falling off the ladder when he caught you stealing from his cherry tree.

Luckily, the second concept called "Panaschieren" comes in handy. You manually write John's name onto the pink ballot, allowing you to give your remaining votes to him.

After you're done, you fold the ballot, stuff it into the envelope and drop it into the ballot box. With a strong feeling of accomplishment, you head to the bars. To discuss your successful voting with Paul, and to get rid of that horrific taste the envelope glue left in your mouth. You secretly promise yourself, next time you'll vote for the party to introduce self-adhesive envelopes to the German election system.

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papel continuo powa!
Creative Commons License photo credit: manci
For our upcoming honeymoon, I am currently reserving a number of hotel rooms on the beautiful island of Corsica.

Intriguingly, so far, under the emails two of these hotels sent me, I found a sentence like the following, asking you not to print out the email:

Afin de contribuer au respect de l'environnement, merci de n'imprimer ce courriel que si nécessaire - please consider the environment before printing this e-mail.

I wonder if this is a "Corse thing", or if it's just a coincidence. Pretty cool, nonetheless.

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Creative Commons License photo credit: Baffs
Ich bin nicht sicher, ob es das schon einmal gegeben hat, aber dass man ein Fußball-Länderspiel live im Internet sehen kann, finde ich prima. schreibt:

Das Länderspiel zwischen China und Deutschland wird heute live im Ersten und bei zu sehen sein. Der Videostream startet um 14 Uhr und ist aus rechtlichen Gründen nur von Rechnern in Deutschland zu empfangen. Nach dem Spiel stellt die Höhepunkte als Video on demand zur Verfügung. Diese Videos sind territorial nicht eingeschränkt.

Die Einschränkung auf "nur Deutschland" ist natürlich ein wenig bedauerlich, vor allem für fußballinteressierte Auslandsdeutsche, aber das ist ja international keine Seltenheit.

Trotzdem: Fußball-Länderspiel als Livestream, die in Büros arbeitende Bevölkerung wird es Ihnen danken, liebe ARD.

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Am Wochenende flog ich von den USA nach Deutschland und bekam am Gate von den Lufthansa-Mitarbeitern ein Flugblatt des Robert-Koch-Instituts in die Hand gedrückt, in dem sie vor einem "neuartigen Grippevirus" warnt. Aus dem Inhalt:

Sehr geehrte Fluggäste, in dem Land, in dem Sie zu diesem Flug eingestiegen sind, ist es kürzlich zu Grippe-Erkrankungen gekommen, die durch ein neuartiges Grippevirus hervorgerufen wurden.

Auf der Rückseite wird der möglicherweise behandelnde Arzt über die "Schweinegrippe" informiert und spezifische Anweisungen gegeben, mit welchen Grippemitteln der Patient behandelt werden sollte.

Die Ausgangsfassung des Robert-Koch-Instituts (erhältlich auf dessen Webseite) enthält hingegen keine spezifischen Dosisanweisungen, und empfiehlt den Medizinern lediglich die "Gabe von Neuraminidasehemmern in therapeutischer Dosierung gemäß Fachinformation in Erwägung [zu] ziehen".

Lufthansa Influenza Flugblatt

Mit einem Klick auf das Bild könnt ihr das ganze Dokument als PDF-Datei ansehen.

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Google Calendar has a new feature that many international Mozillians may like: It can now display more than one time zone at a time. In my case, lining up the Central European and Pacific time zones next to each other comes in quite handy:

Google Calendar: Time Zones

Of course, when entering a new event, it does not seem to allow selecting the time zone this refers to quite yet, let's hope that'll be fixed in a future iteration.

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My colleague Dave made a little Google Maps mashup, illustrating where in the world Mozilla employees are. The result is quite an impressive map:

Mozilla Employees International

Over at Dave's blog, you can actually zoom in to see more closely where people are. The one in Munich, Germany, is yours truly, by the way.

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