gh-fork-ribbon.ie.css

/* IE voodoo courtesy of http://stackoverflow.com/a/4617511/263871 and
 * http://www.useragentman.com/IETransformsTranslator */
.github-fork-ribbon-wrapper.right .github-fork-ribbon {
  /* IE positioning hack (couldn't find a transform-origin alternative for IE) */
  top: -22px;
  right: -22px;

  /* IE8+ */
  -ms-filter: "progid:DXImageTransform.Microsoft.Matrix(M11=0.7071067811865474, M12=-0.7071067811865477, M21=0.7071067811865477, M22=0.7071067811865474, SizingMethod='auto expand')";
  /* IE6 and 7 */
  filter: progid:DXImageTransform.Microsoft.Matrix(
    M11=0.7071067811865474,
    M12=-0.7071067811865477,
    M21=0.7071067811865477,
    M22=0.7071067811865474,
    SizingMethod='auto expand'
  );
}

.github-fork-ribbon-wrapper.left .github-fork-ribbon {
  top: -22px;
  left: -22px;

  /* IE8+ */
  -ms-filter: "progid:DXImageTransform.Microsoft.Matrix(M11=0.7071067811865483, M12=0.7071067811865467, M21=-0.7071067811865467, M22=0.7071067811865483, SizingMethod='auto expand')";
  /* IE6 and 7 */
  filter: progid:DXImageTransform.Microsoft.Matrix(
    M11=0.7071067811865483,
    M12=0.7071067811865467,
    M21=-0.7071067811865467,
    M22=0.7071067811865483,
    SizingMethod='auto expand'
  );
}