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Ran into this one today, in somewhat unique circumstances: I had a hover style where buttons inside a table row only appeared when the mouse was over the row, and if you clicked on one of the buttons but moved the mouse into another row before releasing the mouse button, the previous row would stay highlighted.

The authoritative writeup of the bug, and most others, refer to the problem happening with dynamically-displayed submenus, but make little mention of my particular problem. There was some hope that triggering hasLayout would fix the problem, as it’s the closest thing we have to a magic bullet, but it (shocker!) didn’t work for me.

What did work for me was reverting back to the brute-force method one had to use for older versions of IE: using JavaScript onmouseover/onmouseout events to trigger a hover style¹ rather than the :hover pseudoclass. So much for IE7 implementing :hover on non-anchor elements. Sigh.

¹ See the first comment. And shame on you, Webmaster World, for not having permalinks to the comments. Get a load of their generated source, too: they’re still using font tags. Seriously?! And this is a resource for webmasters? Come on.

Robert Nyman has posted an updated version of his ultimate getElementsByClassName. It takes advantage of the native getElementsByClassName support in Safari 3, Firefox 3 and Opera 9.5^*, takes advantage of native XPath support if it’s available, and allows multiple class names in the request, among other things. ROCK.

^* And ooh, big surprise, guess which modern browser is getting lapped by the others and choking on their dust? IE7.

So you may have seen me mention before how, every day since I wrote this post about a workaround for the IE7 z-index bug, it has accounted for anywhere between 25 and 50% of my traffic.

Which is cool, don’t get me wrong. But when I was checking out my site statistics this morning, I realized that one of my more recent visitors, going to that post, was coming from the microsoft.com domain, meaning that s/he is a Microsoft employee.

Oh, the irony is simply delicious.

Update 2009/09/12 09:19—The jQuery version of the dynamic z-index function has been optimized to use hover instead of mouseover/mouseout. Thanks to commenter Eric Conner for pointing out my mistake.

Update 2009/08/04 22:22—The jQuery version of the dynamic z-index function has been added.

Update 2009/07/09 10:52—The code has been updated to make use of the latest innovations in the Prototype library, and to take suggestions from commenters into account.

Now that we’ve officially transferred support of our big application from IE6 to IE7, I’ve been spending more and more time delving into the nitty gritty details of making that hugely complicated layout (recently made less complicated, but that’s another blog post) work in IE7.

I had thought, initially, that IE7′s superior CSS support would make my life a lot easier, and it did in some ways: my IE7-specific stylesheet is a fraction of the size of the IE6-specific one, and the ability to use attribute selectors is huge for me. But as I should have expected, I just traded one set of headaches for another. While IE7 is far superior to IE6 in terms of CSS support (and far inferior in other ways, user interface chief among them—but that’s another blog post, too), the bugs that still exist are more subtle and far more difficult to work around.

The IE z-index bug had been around since IE4 or 5, and was finally fixed in IE8. It’s still an issue in IE7, however, and chances are that you, the web developer, still have to support it. You should read Aleksandar Vacić’s in-depth characterization of the problem to really understand what’s happening, but what it boils down to is this: the CSS 2.1 spec says that a positioned element with any integer z-index value (i.e. not auto) should create its own zero-based stacking context, and use the integer value specified to decide its place in its parent stacking context. In other words, if the positioned element has a z-index of auto, its stacking context is inherited from its parent. Internet Explorer, however, creates a new stacking context for elements with any z-index value, including auto, which wreaks all kinds of havoc and generally causes mayhem in your previously neat and orderly layouts.

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Making your site work in IE
So there you are, with a good understanding of the standards, armed with some great CSS UI conveniences, and a snazzy prototype. But then you fire it up in Internet Explorer 6 for Windows, and it all goes to hell. You’ve got unnecessary horizontal scroll bars, magically disappearing and reappearing content, and list bullets where you don’t want them. Mysterious extra right and left padding, odd positioning, and static content that jumps when you hover on a nearby link. Problems galore, and you’re ready to tear your hair out. (My colleagues say that they know when I’m working with IE because I start swearing at my computer.) It’s inevitable, really.

But cling to hope, gentle reader, because you’re not the first, and, I am confident in saying, not the last to have these problems. In fact, most of the problems you will encounter have already been found—and solved. But before I get to that, let’s discuss the problem of how to hack your CSS to work in IE such that it’ll degrade gracefully when your users inevitably upgrade to IE7.

Up till now, there have been a number of ways to create blocks of your CSS that are only visible to IE, but they’re, well, hacks, and can’t be trusted to work forever. The best way to add IE-specific styling, I’ve found, is by using conditional comments and an entirely separate stylesheet.

OK. Moving on. Now you know how to add IE-specific styling to your app, let’s find out what that styling should be. You’ve got a passel of problems, but no idea how to solve them. Where do you go for help? You go to the Bible: PositionIsEverything’s list of Internet Explorer bugs and their workarounds, if there are any. Another great article on the subject can be found at CommunityMX (a mostly subscription-only site, unfortunately): How to attack an Internet Explorer (Win) display bug.

For further reading on IE’s display bugs, don’t miss these articles:

• Internet Explorer and the CSS box model
• On having layout — the concept of hasLayout in IE/Win

Other articles you may find useful:

• Button width in IE, a discussion on how to get rid of all the extra padding IE seems to automatically add to buttons and submit inputs.
• CSS and browser compatibility

With all these tools in your arsenal, you can go forth and battle most all the weird browser bugs out there (more on this in another post) and come out the other side alive and even relatively unscathed.

Browsers and browser-plugins
First, let me explain a bit of my strategy. As I said, I code to the standards and then hack for browser compatibility. My first line of defense is Safari/Firefox, and once I have my styles/layout working in both of those, I move on to IE6. I am not supporting IE7 at this time, because our clients run mostly IE6 and have no immediate plans to upgrade.

The browsers alone are not enough, though. Each needs some kind of enhancement or companion tool to help me debug my CSS code.

• Safari + XyleScope: Safari you know about, and XyleScope, you probably don’t. The latter is the only application of its kind out there, and I really wish it wasn’t; I wish there were versions of it for every browser and every operating system. What it does is use the Safari rendering engine to render any URL you give it, and dissects the styles used in every component. The killer part of this app is that you can select any item on the page by clicking on it, and XyleScope will give you the complete breakdown of styles that apply to it (and most importantly, in which order), its place in the markup hierarchy, and a graphical representation of its box model rendering, the last of which is sometimes priceless. I’d love love love to get a tool like this for IE, the browser with the most weird box model-related rendering bugs, but there just isn’t one that does that for me (more on this later).

  XyleScope does have some shortcomings, though. One is that it only uses the Safari rendering engine, which gives it limited usefulness when testing cross-browser compatibility. The second—and crucial—one is that it doesn’t deal with generated elements very well. So when I’m testing with my webapp running, and much of the content is generated by my server-side code, XyleScope gives up.

• Which is mostly the reason that I use WebKit, the open-source, next-generation, beta version of Safari. It’s got two important advantages over Safari, the first being that it lets you style form elements, which Safari does not (which blows). Secondly, it’s got this awesome (seriously, I can’t say enough about it) “inspect element” feature that will inspect any element in your final page, and give you all the goods on it, from place in the markup hierarchy, final computed style, and a listing, like XyleScope’s, of what styles from your stylesheet apply and in which order. On top of that, it’s got a lovely clean interface that is a pleasure to use (except for the obnoxious scrollbar behavior in the markup hierarchy section, but I’m hoping that’ll be fixed soon).
• Firefox + FireBug: Firefox is my control group. Besides Safari/Webkit, it’s probably the best widely-used browser with regard to standards support. If my site works in Firefox, it’ll (mostly) work in every other browser. As I said, debugging is crucial to my work, so I use the immensely useful FireBug plugin to help me inspect generated elements when testing. Feature-wise, it’s almost identical to the inspect element functionality in WebKit, but it’s a little less stable and doesn’t have as nice of a UI; and really, you can say the same of Firefox in general in comparison to Safari/WebKit. That said, FireBug is an invaluable debugging tool.
• Last but unfortunately not least, Internet Explorer and the IE developer toolbar: IE6. What can I say? Like any other web developer who has ever tried to program for it, I hate it. But most of my users use it, so what can I do? Since most of my debugging takes place in IE6, it was vital that I had some sort of debugging tool, because XyleScope isn’t available for Windows. Enter the IE developer toolbar. Much like the inspect feature in WebKit and FireBug for Firefox, this helps you select elements on your rendered page and inspects them, HTML, CSS and all. My very favorite part of this is the tool that allows you to size your window to any of a set of common resolutions, so you can see just how much your users can see, and design accordingly. I couldn’t live without this, as it makes my job that much easier.

according to this interview with Microsoft’s Chris Wilson, IE7 will be much more standards-compliant than IE6, if not fully standards-compliant. Yeah. I’ll believe it when I see it. (Via Slashdot)

using Internet Explorer over a year ago:

1. No support for tabbed browsing.
2. No support for partially-transparent PNGs.
3. And the big one: incomplete CSS2 support.

As if that wasn’t bad enough, there didn’t seem to be relief in sight. It seemed that the new version, IE7, would only come out with the launch of Windows Vista, and that’s still months off. But recently, IE7 finally went into public beta. WebMonkey has a review:

How Does IE7 Stack Up?

While this list of new features is impressive, the other choices in the browser marketplace still have IE7 beat. True, it’s still in beta, but Internet Explorer 7 has some inherent shortcomings that will keep it from being the browser of choice for absolutely everyone.

First and foremost, there’s cross-platform compatibility. Firefox and Opera are being developed for multiple platforms simultaneously, but Internet Explorer remains steadfastly Windows-only. Second, but equally as crucial, is the fact that Microsoft won’t be able to one-up Firefox’s extensible architecture anytime soon. Firefox’s extension management capabilities, not to mention the wide range of extensions available for both developers and basic users, are practically unbeatable at this point.

Finally, CSS support, while vastly improved since version 6, is still incomplete, with limited support for pseudo-classes and CSS-P declarations. Microsoft promises that it will continue to build in support for CSS elements between now and the official release of IE7. Even with these shortcomings, IE7 is shaping up to be a huge step in the right direction. Though the exact figures are difficult to pin down, it’s safe to say that over 80% of the world uses Internet Explorer right now. Users who’ve been chugging along in their asthmatic installs of IE6 are in desperate need of an upgrade. IE7 gives these users more security and a new level of functionality that they may not even have been aware existed.

We’ll go ahead and predict that millions of new RSS devotees will be born this year solely because of IE7′s built in feed reader. And you’ll be able to nod and smile slowly when Aunt Rita tells you that she doesn’t know how she ever survived without tabbed browsing. That, at least, makes IE7 something to look forward to.

So they’re still not going to have complete standards support. And that’s why I’m not going back. But maybe (hopefully!) programming for IE7 will be easier than for IE6.