Allow users to disable the hacks surrounding IE6&7 by disabling legacy support for IE.

frameworks/compass/stylesheets/compass/_support.scss

@@ -0,0 +1,26 @@
+// Usually compass hacks apply to both ie6 & 7 -- set this to false to disable support for both.
+$legacy-support-for-ie: true !default;
+
+// Setting this to false will result in smaller output, but no support for ie6
+$legacy-support-for-ie6: $legacy-support-for-ie !default;
+
+// Setting this to false will result in smaller output, but no support for ie7
+$legacy-support-for-ie7: $legacy-support-for-ie !default;
+
+// @doc off
+// The user can simply set $legacy-support-for-ie and 6 & 7 will be set accordingly,
+// But in case the user set either of those explicitly, we need to sync the value of
+// this combined variable.
+$legacy-support-for-ie: $legacy-support-for-ie6 or $legacy-support-for-ie7;
+// @doc on
+
+// Support for mozilla in experimental css3 properties.
+$experimental-support-for-mozilla   : true !default;
+// Support for webkit in experimental css3 properties.
+$experimental-support-for-webkit    : true !default;
+// Support for opera in experimental css3 properties.
+$experimental-support-for-opera     : true !default;
+// Support for microsoft in experimental css3 properties.
+$experimental-support-for-microsoft : true !default;
+// Support for khtml in experimental css3 properties.
+$experimental-support-for-khtml     : true !default;

frameworks/compass/stylesheets/compass/css3/_inline-block.scss

@@ -3,10 +3,14 @@
 // Provides a cross-browser method to implement `display: inline-block;`
 
 @mixin inline-block {
+  @if $legacy-support-for-ie {
+    & { *display: inline; }
+  }
   display: -moz-inline-box;
   -moz-box-orient: vertical;
   display: inline-block;
   vertical-align: middle;
-  *display: inline;
+  @if $legacy-support-for-ie {
     *vertical-align: auto;
   }
+}

frameworks/compass/stylesheets/compass/css3/_shared.scss

@@ -1,13 +1,4 @@
-// Support for mozilla in experimental css3 properties.
+@import "compass/support";
-$experimental-support-for-mozilla   : true !default;
-// Support for webkit in experimental css3 properties.
-$experimental-support-for-webkit    : true !default;
-// Support for opera in experimental css3 properties.
-$experimental-support-for-opera     : true !default;
-// Support for microsoft in experimental css3 properties.
-$experimental-support-for-microsoft : true !default;
-// Support for khtml in experimental css3 properties.
-$experimental-support-for-khtml     : true !default;
 
 // This mixin provides basic support for CSS3 properties and
 // their corresponding experimental CSS2 properties when

frameworks/compass/stylesheets/compass/utilities/general/_hacks.scss

@@ -1,3 +1,5 @@
+@import "compass/support";
+
 // The `zoom` approach generates less CSS but does not validate.
 // Set this to `block` to use the display-property to hack the
 // element to gain layout.
@@ -7,6 +9,7 @@ $default-has-layout-approach: zoom !default;
 // to gain the "hasLayout" property in internet explorer.
 // More information on [hasLayout](http://reference.sitepoint.com/css/haslayout).
 @mixin has-layout($using: $default-has-layout-approach) {
+  @if $legacy-support-for-ie {
     @if $using == zoom {
       @include has-layout-zoom;
     } @else if $using == block {
@@ -16,20 +19,28 @@ $default-has-layout-approach: zoom !default;
       @include has-layout-zoom;
     }
   }
+}
 
 @mixin has-layout-zoom {
+  @if $legacy-support-for-ie {
     *zoom: 1;
   }
+}
 
 @mixin has-layout-block {
+  @if $legacy-support-for-ie {
     // This makes ie6 get layout
     display: inline-block;
     // and this puts it back to block
     & { display: block; }
   }
+}
 
 // A hack to supply IE6 (and below) with a different property value.
 // [Read more](http://www.cssportal.com/css-hacks/#in_css-important).
 @mixin bang-hack($property, $value, $ie6-value) {
+  @if $legacy-support-for-ie6 {
     #{$property}: #{$value} !important;
-  #{$property}: #{$ie6-value}; }
+    #{$property}: #{$ie6-value};
+  }
+}