CSS framework doesn't support IE8 opacity

[jgv]

CSS suports IE 5-7 and IE9 but not IE8. See ​http://www.quirksmode.org/css/opacity.html

Bug fix/pull request => ​https://github.com/jquery/jquery-ui/pull/250

[M.Gaetan89]

The pull request has been closed and not merged. What about this ticket, then ?

[Scott González]

The pull request wasn't acceptable, please see the comments. Feel free to send an updated pull request.

[tj.vantoll]

Thanks for taking the time to contribute to the jQuery UI project. Per #8237 this should now be complete. Yes, we are not including the specified syntax for IE8, but everything renders correctly.

Opacity is used within the library for displaying widgets in their disabled states as well as for the overlay shown when modal dialogs are displayed. Here is a test case showing every widget that can be disabled in the toolkit in its disabled state - ​http://jsfiddle.net/tj_vantoll/CFgDL/. It also includes a button that will display a modal dialog so the overlay can be seen. Compare the test case in IE8 and the most recent Chrome and Firefox and there are no visual differences in the opacity displayed.

If you can come up with a test case that shows an issue in IE8 please let us know so we can tackle this. To get you started, use this boilerplate: ​http://jsfiddle.net/ZgAqH/ Open the link and click to "Fork" (in the top menu) to get started.

[Scott González]

This isn't fixed unless something changed. It's either worksforme or open. I'll set it to pending for a test case.

[mikesherov]

Thanks for contributing. However, this is unnecessary, and quirksmode.org is just wrong. Here is what's needed for cross-browser opacity: ​http://css-tricks.com/css-transparency-settings-for-all-broswers/