Comments on: A Little PIE with that CSS3?

By: SilentLennie

SilentLennie — Fri, 23 Jul 2010 11:37:36 +0000

This is very much like IE7 by Dean Edwards, not sure if it’s a good idea for performance, I would be very careful with it’s use.

By: Ahmadalfy

Ahmadalfy — Wed, 21 Jul 2010 17:13:06 +0000

Can I just create my CSS document and using the IE conditional statement IE9 > using something like
* { behavior: url(PIE.htc); }
or whatever element I wanna apply the style to
What do you think?

By: pendensproditor

pendensproditor — Wed, 21 Jul 2010 15:00:29 +0000

This looks very cool, however in my tests so far it’s rarely been seamless. It seems to have a habit of wiping out background colors of elements its applied to. It also changed the proportions of a fieldset.

I’ll be eager to see sturdier versions in the future.

By: adunn

adunn — Tue, 20 Jul 2010 15:03:45 +0000

@Baryn Rounded corners can be emulated with VML in IE, and having nodes inserted into the DOM may or may not be a problem. It depends on what you’re using it for. The bigger problem is that these abstractions are probably pretty leaky, but again it depends on your use.

Overall it sounds like a pretty sweet hack. Nice work.

By: Baryn

Baryn — Mon, 19 Jul 2010 22:58:41 +0000

IE cannot do round corners natively, when will folks realize this? Also, this script inserts nodes into your DOM, and I will never use a library which does this. Yuck.

By: MattCoz

MattCoz — Mon, 19 Jul 2010 18:09:38 +0000

Oh, and one other thing, this kind of breaks Modernizr as it will still report IE as not supporting these features. So keep that in mind if you want to use both.

By: MattCoz

MattCoz — Mon, 19 Jul 2010 18:05:25 +0000

Very interesting work, I’ve been trying it out all weekend and I’ve been quite impressed. My biggest problem is performance as Schill mentioned, the CPU is chugging for a good second or two on page startup and probably slowing down everything else. I think the key if you are going to use it is to use it sparingly and on elements that aren’t going to be changing often.

By: lojjic

lojjic — Mon, 19 Jul 2010 17:22:18 +0000

@ahallicks – Disappearing backgrounds usually mean a z-index issue; see the top of the Known Issues documentation page for how to get around that. Also, I’d greatly appreciate it if you could file bug reports for “things not seeming to work at all” so I can get them fixed. Thanks!

@Schill – FYI those performance issues you mention are a problem with IE CSS *expressions*, not behaviors. Very different beasts!

By: Schill

Schill — Mon, 19 Jul 2010 17:07:15 +0000

Tempting to throw into a site's CSS, looks to be a nifty implementation; but, I would look very carefully at performance in IE before and after including this. CSS behaviours (.htc files, etc.) are known to be horrible for performance, given that the attached JS code can be run hundreds or thousands of times as mousemove() events fire, for example. This said, I applaud the author's work at making IE "just work" with modern CSS. Libraries like these are often useful and appreciated, particularly if they are fast. :P

By: fabienmenager

fabienmenager — Mon, 19 Jul 2010 16:48:15 +0000

Very good job !

By: drasill

drasill — Mon, 19 Jul 2010 16:19:42 +0000

That’s a *very* good job.

By: ahallicks

ahallicks — Mon, 19 Jul 2010 15:59:52 +0000

I tried it on my site and there were a few bugs, such as form backgrounds completely disappearing and some things not seeming to work at all despite being in the ‘supported’ category.

Still, an interesting project, and could be very useful once bugs are ironed out!