Report more old IE / Firefox specific hacks

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/* Everything but Internet Explorer 6  */
html>body #tres { color: red }

Comprehensive List of Browser-Specific CSS Hacks by Paul Irish

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Browser hacks

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.foo { -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=70)" }

Introduction to Filters and Transitions:

This topic documents a feature of Visual Filters and Transitions, which is deprecated as of Windows Internet Explorer 9.

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MDN: opacity:

• prior to version 9, Internet Explorer does not support opacity, rather it supports filter instead.
• IE4 to IE9 supported the extended form progid:DXImageTransform.Microsoft.Alpha(Opacity=xx)
• IE8 introduced -ms-filter, which is synonymous with filter. Both are gone in IE10

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Acts as an !important; string after ! can be anything (IE 7-):

.selector { property: value !ie; }

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