Podcast #23: We Know You Al

March 29th, 2013

Last night Dylan Wilbanks and I recorded a new Squirrel and Moose podcast. Here’s how Dylan described it:

Dylan and Kyle delve into Faruk Ates’ idea of giving non-anonymous commenters priority in comment threads. Also, the forthcoming Squoose meetup, an in-passing X Files reference, Dylan and Kyle compare age of their oldest e-mail addresses, and almost no web content.

For those of you who will be in Seattle on Monday,  April 1st (including you AEA attendees), if you’re into hanging with Dylan, myself, and a few other web geeks for a quality evening, I suggest you attend the first Squeetup (Squirrelcon? Squoosecon? Who knows?!)

If you use Facebook, you could even let us know you’re coming, which we’d appreciate.

Follow this link to listen to Episode #23.

Podcast #22: Of Google And Men

March 22nd, 2013

Last night I performed my normal Thursday ritual, carefully keeping the seals that hold the ancient ones in their slumber in the deepest trenches of the sea…

Er, I mean, joining co-host Dylan Wilbanks for another episode of Squirrel and Moose.

I’d like to think we’re hitting our stride at this point. We discuss Donglegate with an enforced 10-minute limit and what I think constitutes a fairly balanced, nuanced view. We then dive into a talk about Google Reader which nicely spins into a discussion about Google’s behaviors in general these days.

Here’s the synopsis, as cleverly put by Dylan:

Kyle and Dylan delve yet again into Yet Another Sexist Incident that ended with (almost) every party looking terrible, and then a long, rambling talk about the end of Google Reader and the Twilight Of The Web. Also, why there will never be another Jeffrey Zeldman, TV stations owned by flour mills, making AR-15 parts with 3D printers, raising girls to be programmers in a brogrammer world, and their inability to properly close out the episode.

Check it out: Squirrel and Moose: Episode 23 – Of Google And Men

Venn diagram of my work week

March 21st, 2013
CSSquirrel #107: Venn diagram of my work week

It’s been a hell of a week.

In addition to the Kobayashi Maru situation that has become “Donglegate“, and all the other random crap that’s existed in tech culture and the world at large this week, it’s been a pretty horrid work week for me personally as well.

Today’s comic is a pair of Venn diagrams that illustrate this. Short version: I had a week scheduled out with pure, unadulterated awesome. The kind of project that excites me and makes me enjoy and love what I do. Instead, a number of typical work emergencies piled up and I was the one trapped with a number obnoxious debug tasks that were outside of my specialty and that resulted in a very long slog of poking sticks at a website in the hopes that somehow I’d be granted wisdom.

Oh, and I had a rather unexpected case of kidney stones cause me the 2nd most excruciating pain of my life on Sunday and Monday. (The greatest pain I’ve ever experienced was an abscessed tooth. You never, ever in your life want that. Trust me.)

So this week can go shoot itself in the face.

However, life goes on. And another week is around the corner (also, hey, it’s spring now in the Northern Hemisphere!)


November 16th, 2012
CSSquirrel #106: Bonerfart

I’m about to say something I never thought I’d ever say: I’m going to let Kanye West speak for me.

Let’s have a toast for the douchebags,
Let’s have a toast for the assholes,
Let’s have a toast for the scumbags,
Every one of them that I know

Or, in the immortal words of Sir Hammerlock:

Screw it, let’s just call them bonerfarts.

Sara Wachter-Boettcher, the less farty of today’s two guest stars, wrote one of the most important articles ever posted on A List Apart, entitled Universal Design IRL. In it, she speaks to the value of inclusivity in our industry, in our conferences, and in our lives. It’s well thought and well-spoken, engaging without being confrontational. It’s a timely message that we need to hear. And it got the critical reaction it deserved, with a wide and respectable section of the web design community doing fist-bumps and congratulating Sara on her piece.

Oh, and Andy Rutledge (today’s less erudite guest star) took the opportunity to show his colors as a troll by trying to roll back the march towards an inclusive culture with shameless, well-spoken but intellectually empty flamebait.

When the community collectively and decisively stepped up to counter his hollow rhetoric, the best he could manage was passive-aggressive counterattacks that amount to the following:

1. We’re the bigots by hating on white males. Not him. (Note: I’m a white male, not a red squirrel)

2. Everyone is born equal, so what the hell are we whining for?

3. Racism and sexism have been fixed, so everything is peachy.

4. I’ve got a wife and a bi-racial son, so I’m cool.

As a quick note: Men who were trying to suppress universal suffrage had wives. They probably even loved them. That didn’t make their words and actions less sexist.

Before I continue, I want to publicly apologize for a grave error I made yesterday. While tweeting about Andy, I called him a “great designer” while still noting he’s a bigot. On further reflection, I realize that’s the “great designer” part isn’t remotely close to true. We can’t compartmentalize someone, where we say “Oh, he’s terribly racist, but not too bad a fellow”. Andy’s shown his colors enough times that we can safely say “great” doesn’t reflect what he is.

Several more experienced members of the community who have seen Andy’s tirades say he’s not worth engaging. They suggest that we shouldn’t feed trolls. They’re right in one thing: Andy is a lost cause. He’s a relic that represents a time and culture that promoted and sustained racism and sexism, that hid their policies of hate or race superiority under false claims that “Everything’s fine and if they’re suffering it’s their own fault for not trying harder.”

Screw them.

Despite that, we do need to speak out and publicly shame the trolls when they come out of their fetid, subterranean lairs. Here’s two concrete examples why:

#1: A young white male developer, in response to yesterday’s discussion of diversity in tech.

I’m saying difft cultures & genders favor different things. I don’t care for Pinterest or knitting. Are you upset by this?

I’m saying if white dudes like IT or CS and women don’t, people of color don’t, you are imagining barriers that don’t exist.

#2: A young woman developer, in discussion about the same issues that she faces daily when dealing with “inclusion” in the community:

I wish they’d get emails like this in their inbox every day. – It’s a mental barrier that chips away at confidence.

Andy is a lost cause. He’s just bad gas in the room. But this young man, and this young woman, represent two problems. The first feels emboldened to defend barriers in the workplace because unchallenged garbage from “established” designers like Andy supports his (observably, provably false) world view that there’s no problem. The latter feels intimidated to the point that she’s afraid to call people out when they objectify and imply rape for fear of retribution.

When you, or I, or anyone in the field takes the time to publicly call Andy a bonerfart, we help men realize that douchebaggery is just that, and we help young women realize they have allies and can speak out. We don’t need to treat bonerfarts with respect, we don’t need to take them seriously. But we need to seriously ensure that the conversations that happen aren’t being dominated by the same old, tired, ol’ fashion bigots. So when others look at what’s going on, they see that there isn’t a consensus that is hostile to diversity in our culture.

At Mindfly, three of the five developers/designers are women. They’re good at their jobs, and can kick my ass at design any day of the week. They should never have to accept lower pay, glass ceilings, unwelcome advances or be demeaned because of their gender. Here at Mindfly they aren’t. I’m proud of that.

But I want to be proud of the whole industry. And the only way to do that is call out the bonerfarts when they happen, so everyone knows that it’s not the whole industry that stinks. It’s just the ostracized assholes.

(For more on this topic, you can check out Dylan Wilbanks and I dismantling Andy’s relevancy in our newest podcast here.)

CSS Hitbox Detection

October 24th, 2012

Note: Read this to the end before you get too excited. This is an interesting CSS hack/exercise, but it faces a major hurdle that limits its applicability.

File this under: cool tricks with CSS that might be a poor use of your time, or might be more awesome than two unicorns doing synchronized backflip space diving.

Over the weekend while brushing up on CSS animations, I had an errant thought involving how the brains of certain types of flies operate.

Which I won’t go into for now. Let’s just say that nature is weird, providing very disparate solutions to the same problem. (In the case of the flies it was how they think.)

The relation to what I was doing at the time is that we’re in a situation where we can animate elements in a browser with the aid of Javascript, or we can now do it with just CSS. I was exploring the range of wacky things I could accomplish with pure CSS, sans Javascript. One of the interactions I wanted to see if I could accomplish was hitbox detection.

In video game programming, hitbox detection is used to determine when one moving element (like Blinky the ghost’s ectoplasmic tendrils of love) touches another moving element (like Pac-Man’s glorious, circular body.) And once that event is detected, the game then causes something to happen. (In the family-safe industry of 80′s arcade games, this means that Pac-Man dies a horrible death, questioning the futility of his existence. In my fevered dreams it would instead result in an erotic love scene of the Pac-Man/Blinky slash variety. Which, I think we all agree, would make for an excellent arcade machine hack.)

We’ve established that CSS can animate objects. But detecting a collision between two of them? Impossible!


CSS does possess some rudimentary event detection based around the mouse interacting with page elements. :focus, :checked, :hover, etc. Most of them require users to actively do a discrete event, which is less useful for actively polling for something like the collision between two objects in real time.

:hover, however, provides us with a bit of a possibility. The mouse is just hanging out there on the page, doing its thing. It’s typically hovering over something. Can we make that work for us?

Hover over what?

The mouse hovers over one element at any given point in time, which triggers the :hover pseudo-class for CSS on that element and any of its parents, all the way up to the root.

Let’s assume a very simple problem situation which we’ll be turning into this demo. We have a stationary ‘avatar’, which for the purposes of our demo is a green circle sitting in the middle of the page. We also have an animated ‘mob’, which we’ll render as a black square. The mob is animated to sweep horizontally back and and forth across the page underneath the circle.

What we want to do is detect when the mob passes under the avatar in a simplified, horizontal-only collision detection.

We’ll want this to happen regardless of where our mouse is, which presents a problem. We can’t be hovering the cursor over the avatar, so how will we know when the mob lines up with us?


What we want is the ability to detect an overlap at any point in time, regardless of the mouse’s position. To do this, we’re going to create a grid of invisible elements that are aligned around both the avatar and the mob. In our demo, we’ll call the ones attached to the avatar .switch, and the ones attached to the mob .sensor. We’re going to create enough sensors on each side of the elements so that regardless of where they are on our page, the mouse can be hovering over a sensor for each of them. In our case we’re only detecting for a horizontal overlap, so our sensors are as tall as the page. In a situation where we’re worried about vertical overlap, we’d be creating a grid of squares, greatly increasing the amount of discrete sensors we’d be making.

The avatar is stationary, so its sensors can remain stationary with it. The mob is not, so its sensors will have to be animated as well to follow its movements.

Double Hover Detection With Pointer-Events

The reason we’ve made all these sensor elements is to help us detect the avatar and mob overlapping regardless of where the mouse is. Each sensor grid is aligned in space around their respective icon, so when the mouse lines up over both the avatar’s sensors and the mob’s sensors of the same corresponding position, we know that where the avatar and mob are, they too are overlapped. (So, for example, if the leftmost avatar sensor and the leftmost mob sensor are both under the mouse, we can know that the avatar and mob are also overlapped).

Of course, the problem is that CSS can’t detect if the mouse is hovering over more than one element. The first one it encounters interrupts detection on the others.

Pointer-events is a CSS property that I don’t see discussed much, but that proves to be very convenient. It interacts with SVG in all sorts of strange ways, but with ordinary markup and CSS it still has two options. When set to “auto”, the element interacts with the mouse as desired. When set to “none”, the element no longer interacts with the mouse at all, becoming ‘transparent’ to mouse events. Hovers, clicks, it completely disregards them, and the events pass under it to whatever element is beneath.

We can exploit this to provide a sort of double hover detection.

In our demo, we make sure that all our .switch elements for the avatar’s sensors are set to a low z-index, and that the .sensor elements of the mob’s sensors are set to a higher z-index, but that .sensor also has been set with pointer-events: none. We also make sure that our .switch elements come earlier in our markup than the sensors.

.switch { z-index: 1; }

.sensor { z-index: 2; pointer-events; none; }

We then give .switch a rule for when it’s hovered over that causes its corresponding .sensor to regain its pointer-events (and keep it as long as the mouse is over it). In my demo I’ve given each sensor/switch pair a specific class that corresponds with each other. So for the leftmost pair we’d see a rule like this:

.switch.s1:hover ~ .sensor.s1 { pointer-events: auto; }

.sensor:hover { pointer-events: auto; }

This then causes the .sensor in question to be able to interact with the mouse. Since it has a higher z-index than .switch, it will then catch the mouse’s attention.

If at any point in time .sensor is being hovered over by the mouse and has its pointer-events: auto catching it, this means that it is also overlapping with the corresponding .switch. At which point we can say that we know that the mob and avatar are overlapped. So all we need now is to create a rule that acts on the hover event for .sensor. In this case, we’ll be turning the avatar red to show the event.

.sensor:hover ~ #avatar { background: red; }

Don’t Pop The Cork Yet


Well, sadly, no.

I made this demo while using Firefox. And current builds of Firefox are very distinct from Webkit and Opera in one very crucial fashion: Firefox actively polls the mouse to determine if hover events are occurring even when the mouse is holding still. So if an animated element (like the mob or its sensors) pass under the mouse, it triggers :hover.

However, in these other browsers, they only bother polling for :hover when the mouse is being used (moving it about, clicking, scroll-wheel, etc). Otherwise, it stops looking and any moving elements passing under it don’t catch the :hover.

So here’s my demo of CSS Hitbox Detection. If you check it in a current Firefox build, you’ll see it working. If you check it in any other browser, you will have to keep wiggling the mouse about to make it work. It also appears that nightly builds of Firefox no longer support this, although I don’t know if that’s by intent or not.

I’ve used pretty big sensor boxes in the demo, as I’m only doing a proof-of-concept here. As such, there can be very significant overlap before the collision is detected. In normal circumstances you’d want your sensors to be as tiny as possible (and therefore have tons of them) to provide a much quicker detection.

As it stands, without the support of actively polling for hover, this isn’t useful for any scenario that requires real-time polling. But it may have other useful applications in an on-user demand. (It would be, for example, bad for a CSS-only Pac-Man game [which would be a nightmare in its own right], but might be usable in a situation where you click a button at a specific point to see if two elements are overlapped).


Here’s a pared down test of the use case of how browsers handle hover when the mouse is stationary when elements move under it.

Here’s a message by Eric Meyer on www-talk about the issue it brings up.

Thoughts? Workarounds? Uses?

So, CSS Hitbox Detection can exist. But due to how browsers support the :hover event, it may only have a narrow band of application. Obviously this is the sort of interaction that would be better handled by JS (which I knew all along, but was curious to see if a CSS alternative could be made to work).

That said, I’m just one guy with just one brain. I may have overlooked a workaround, or might be failing to see ways this would apply to something really cool despite it’s apparent limitations. Do any of you have thoughts? Ideas? Applications? Please let me know!