Why Do jQuery\'s `fadeIn()` and `fadeOut()` Cause Opacity Issues in Internet Explorer?

IE Issues with jQuery FadeIn and FadeOut Opacity

When utilizing jQuery's fadein and fadeout functions for CSS overlays in Internet Explorer (IE), users may encounter unexpected behavior. Instead of a smooth transition, IE exhibits immediate opacity changes and renders the page as a solid color during fadeout.

Reason for the Issue

This issue occurs because IE handles opacity differently compared to other browsers. Without any prior opacity settings, IE abruptly switches to full opacity during fadein and renders a solid color when removing overlays during fadeout.

Solution

To resolve this issue, adjust the opacity of the overlay DIV in JavaScript before invoking fadeIn():

$('.overlay').css('filter', 'alpha(opacity=40)');
$('.overlay').fadeIn(500);

Setting the opacity before fadein tells IE the desired starting opacity level, providing a gradual transition. This solution applies particularly to plain DIVs and not transparent PNGs.

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