CSS transparent filter, supports ff, ie6.0, ie7.0, and ie8.0

Filter: alpha (opacity = 50); opacity: 0.5;
Opacity: relative to IE. Firefox does not seem to support it. Value: percentage, 100 indicates the opacity is 100%, and 50 indicates the opacity is 50%.
-Moz-opacity: relative to FF, Firefox. Value: decimal point. 1 indicates that the opacity is 100%; 0.5 indicates that the opacity is 50%.
Note: The above filter IE8 is not supported. Therefore, we need to declare it using <meta http-equiv = "X-UA-compatible" content = "Ie = 7"/>. Force IE8 to display as IE7.

Basically, it can be solved perfectly! The following filters are not supported in ff. Add-Moz before the name to solve the problem.

Other filters
Black/white photo filter: Gray;
X-ray filter: Xray;
Pneumatic fuzzy filter: blur (add = true, direction = 45, strength = 30 );
Sine ripple filter: Wave (add = 0, freq = 60, lightstrength = 1, phase = 0, strength = 3 );
Translucent filter: alpha (opacity = 50 );
Linear transparent filter: alpha (opacity = 0, finishopacity = 100, style = 1, startx = 0, starty = 0, finishx = 100, finishy = 140 );

Radioactive transparent filter: alpha (opacity = 10, finishopacity = 100, style = 2, startx = 30, starty = 30, finishx = 200, finishy = 200 );

White transparent filter: chroma (color = # ffffff );
Color Filter: grays;
Negative filter: invert;
Left-right flip filter: fliph;
Vertical flip filter: flipv;
Projection effect filter: progid: DXImageTransform. Microsoft. dropshadow (color = # cccccc, offx = 5, offy = 5, positives = true );

Mosaic filter: progid: DXImageTransform. Microsoft. pixelate (maxsquare = 3 );
Luminous effect filter: progid: DXImageTransform. Microsoft. Glow (color = # cccccc, strength = 5 );

Soft Edge Filter: alpha (opacity = 100, finishopacity = 0, style = 2

From: http://hi.qhaha.com/post/17.html