Why Doesn't My CSS Opacity Work in Internet Explorer 8?

Addressing Opacity Issues in CSS for Internet Explorer 8

When aiming for opacity adjustments using CSS within Internet Explorer 8, users may encounter challenges that hinder the desired visual effect. This article explores the intricacies of resolving opacity issues specifically in IE8.

One user reported an inability to modify the opacity of trigger text intended for activating a jQuery slide-down effect using various CSS settings. While the changes worked effectively in other browsers like Firefox and Chrome, IE8 presented a persistent issue with opacity alterations.

The CSS code employed included:

.slidedownTrigger
{
  cursor: pointer;
  -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=75)";
  filter: alpha(opacity=75);
  -khtml-opacity: 0.75;
  -moz-opacity: 0.75;
  opacity: 0.75;
}

Despite numerous attempts using different CSS configurations and elements, the desired opacity adjustment remained elusive in IE8. Even the use of the proprietary -ms-filter did not yield the expected results.

The solution that ultimately resolved the issue was the implementation of specific IE-compatible CSS properties:

-moz-opacity: 0.70;
opacity:.70;
filter: alpha(opacity=70);

By utilizing this combination of CSS properties, the opacity modification behaved as intended within Internet Explorer 8. This configuration addresses the browser's unique rendering engine and ensures proper implementation of opacity adjustments.

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